CN109079063B

CN109079063B - Spring conveying device and bagged spring production equipment

Info

Publication number: CN109079063B
Application number: CN201810902017.4A
Authority: CN
Inventors: 叶如剑
Original assignee: Zhejiang Huajian Intelligent Equipment Co ltd
Current assignee: Zhejiang Huajian Intelligent Equipment Co ltd
Priority date: 2018-08-09
Filing date: 2018-08-09
Publication date: 2024-03-29
Anticipated expiration: 2038-08-09
Also published as: CN109079063A

Abstract

The invention discloses a spring conveying device and bagged spring production equipment, wherein the spring conveying device comprises a transfer conveying device and a bagging conveying device, the bagging conveying device comprises a magnetic piece, two first conveying baffles and two first conveying chains, the first conveying chains are wound on the first conveying baffles, the distance between the two first conveying baffles is gradually reduced along the conveying direction, and the magnetic piece is arranged on at least one of the two first conveying baffles; the switching conveyor conveys the spring between the two first conveying chains, the spring is gradually compressed, and the spring is separated from the switching conveyor between the two first conveying baffles when the sum of the holding force of the two first conveying chains to the spring and the adsorption force of the magnetic piece to the spring is larger than the holding force of the switching conveyor to the spring. The spring conveying device has the advantages that the reliability of spring detachment is high, the detachment position is easy to determine, and the production efficiency is improved.

Description

Spring conveying device and bagged spring production equipment

Technical Field

The invention relates to the technical field of manufacturing of bagged springs, in particular to a spring conveying device and bagged spring production equipment.

Background

Pocket springs, also commonly referred to as spring strings, are widely used to produce mattress and sofa cores, the spring strings having a plurality of springs, each of which is located within a pocket of the spring pocket that is spaced apart from one another. In the production of springs using pocketed spring production equipment, a spring coiling machine produces individual springs from steel wires, then the springs are conveyed from the spring coiling machine to a spring bagging conveying mechanism by a spring switching conveying mechanism, and the spring bagging conveying mechanism conveys the springs into pockets and welds to encapsulate the springs, thereby producing spring strings. In this process, the spring needs to be reliably disengaged from the spring changeover conveyor mechanism and then received and conveyed by the spring bagging conveyor mechanism. In the related art, the spring is not reliably separated from the spring switching conveying mechanism, and the separation position is difficult to determine.

Disclosure of Invention

The present application is made based on the findings and knowledge of the inventors of the following facts and problems existing in the related art:

document CN103879604a discloses a pocket spring production compression conveying mechanism comprising a spring conveying mechanism and a spring compression conveying mechanism, the spring conveying mechanism receiving a spring from a spring coiling machine and then delivering the spring to the spring compression conveying mechanism, wherein the spring conveying mechanism comprises a racetrack-shaped belt body provided with a magnetic suction block for sucking the spring, the spring compression conveying mechanism comprises two baffles oppositely arranged on a frame, the distance between the two baffles is gradually reduced from the rear end toward the front end (conveying direction), and conveying belts are respectively wound on the outer sides of the two baffles for conveying the spring along the conveying direction. Along with the rotation of the belt body of the spring conveying mechanism, the adsorbed spring enters between the two baffles and is conveyed by the belt body along the conveying direction, and as the distance between the two baffles is gradually reduced along the conveying direction, the spring is gradually compressed by the two baffles, and when the spring is compressed to a certain degree, namely the friction force between the spring and the conveying belt is larger than the holding force of the magnetic attraction block on the spring, the spring is separated from the spring switching conveying mechanism and is continuously conveyed between the two baffles along the conveying direction by the conveying belt wound on the two baffles.

The pocketed spring production compression conveyor disclosed in the above document has the following problems: the spring is separated from the spring conveying mechanism by virtue of the friction force between the spring and the conveying belt, namely, the spring can be separated from the spring conveying mechanism only when the friction force between the spring and the conveying belt is larger than the adsorption force of the magnetic attraction block on the spring. The compression amount of the spring between the two baffles influences the friction force, and the friction force between the spring and the conveying belt is larger than the adsorption force of the magnetic attraction block on the spring only when the compression amount of the spring reaches a certain value.

It is known to those skilled in the art that the amount of spring that must be compressed before bagging is required for the design of the mattress core in order to design the firmness of the mattress core. Namely, when designing the mattress core, in order to design the hardness, thickness and other dimensions of the mattress core, the model of the spring steel wire needs to be designed, the length of the wool spring (the spring which is not compressed before bagging and is produced by a spring coiling machine) is designed, the compression amount of the spring is designed, and the tensioning force of the spring to the bag after bagging is designed. In other words, in the production of pocketed springs, the springs must be compressed a certain amount of compression before bagging to meet design requirements. Thus, the amount of compression of the spring prior to bagging is limited by the design of the pocketed spring, rather than being set at will.

In the compression conveying mechanism for producing the bagged spring disclosed in the above document, the compression amount of the spring is required to meet the design requirement of the bagged spring (mattress core) on one hand, and the spring is required to be separated from the spring conveying mechanism on the other hand, namely, the compression amount of the spring is limited by two factors, so that the compression conveying mechanism for producing the bagged spring disclosed in the above document has the problems that the separation of the spring from the spring conveying mechanism is unreliable, the separation position is difficult to determine, and the produced bagged spring cannot meet the design requirement and the separation requirement simultaneously.

In other words, in the above-mentioned document, the compression amount of the spring is required to satisfy not only the requirement that the friction force between the spring and the conveyor belt is larger than the attraction force of the magnetic attraction block of the spring conveying mechanism to the spring, but also the design requirement of the pocket spring.

It will be appreciated by those skilled in the art that in the above-mentioned document the amount of compression of the spring is greatest at the front end of the minimum distance between the baffles, so that the friction between the spring and the conveyor belt is greatest at the front ends of the baffles, at least this maximum friction (greatest amount of compression) must be such that the spring is able to disengage from the spring conveyor mechanism, i.e. the spring must disengage from the spring conveyor mechanism at the latest at the end of the spring that reaches the minimum distance between the baffles. Further, this document clearly describes that the spring is separated from the spring conveying mechanism and then conveyed by the conveyor belt outside the shutter, that is, the spring is separated from the spring conveying mechanism before reaching the end where the distance between the two shutters is smallest, in other words, the spring must be separated from the spring conveying mechanism before the compression amount thereof reaches the maximum.

However, in the above-mentioned document, if the spring compression amount required for the pocket spring design is smaller than the maximum compression amount of the spring at the end where the distance between the two shutters is smallest, the compression amount of the spring cannot satisfy both the design requirement and the requirement that the spring be separated from the spring conveying mechanism. For example, the maximum compression of the spring required for the design of a pocketed spring is 10 mm, whereas for the spring to disengage from the spring delivery mechanism, the compression of the spring is at least 20 mm, if the maximum compression of the spring is required to meet the design requirement (compression is less than 10 mm), disengagement of the spring from the spring delivery mechanism cannot be achieved, whereas if the compression is required to meet the requirement for disengagement of the spring from the spring delivery mechanism (compression is at least 20 mm), the design requirement cannot be met.

Moreover, in the above-mentioned document, since the spring is separated from the spring conveying mechanism only by its friction force with the conveying belt, the separation position of the spring between the two shutters is not easily determined, and particularly, as the spring model changes, the stiffness of the wire from which the spring is manufactured changes, and the separation position of the spring changes, even there is a problem that the separation cannot be performed.

In addition, the spring is separated from the spring conveying mechanism only by virtue of the friction force between the spring and the conveying belt, so that the spring and the conveying belt are easy to slip, the reliability of separation of the spring and the reliability of conveying of the conveying belt to the spring are poor, the follow-up bagging is affected, and the production efficiency is reduced.

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of one aspect of the invention provides a production device for the bagged springs, the compression amount of the springs can conveniently meet the disengagement requirement and the design requirement of the bagged springs, the reliability of disengagement of the springs is high, the disengagement position is easy to determine, and the production efficiency is improved.

Another embodiment of the present invention provides a spring delivery apparatus.

The pocketed spring production apparatus according to the embodiment of the first aspect of the invention includes: a frame; the spring coiling machine is used for manufacturing the metal wire into a spiral spring; the spring conveying device comprises a transfer conveying device and a bagging conveying device, the transfer conveying device is used for receiving the springs from the spring coiling machine, the bagging conveying device is used for receiving the springs from the transfer conveying device and conveying the springs along a conveying direction, the bagging conveying device comprises a magnetic piece, two first conveying chains and two first conveying baffles arranged on the frame, one first conveying chain is wound on one first conveying baffle, the other first conveying chain is wound on the other first conveying baffle, the distance between the two first conveying baffles is gradually reduced along the conveying direction, the transfer conveying device is arranged above the two first conveying baffles, and the magnetic piece is arranged on at least one of the frame and the two first conveying baffles; the transfer conveying device conveys the spring between the two first conveying chains and drives the spring to move from one end with a larger distance between the two first conveying baffles to one end with a smaller distance along the conveying direction, the spring is gradually compressed along with the gradual decrease of the distance between the two first conveying baffles when moving along the conveying direction between the two first conveying baffles, and when the sum of the holding force of the two first conveying chains on the spring and the adsorption force of the magnetic piece on the spring is larger than the holding force of the transfer conveying device on the spring, the spring is separated from the transfer conveying device between the two first conveying baffles.

According to the bagged spring production equipment provided by the embodiment of the invention, as the magnetic piece is arranged, the spring is separated from the transfer conveying device by the adsorption force of the magnetic piece to the spring, and only the relation between the adsorption force of the magnetic piece to the spring and the holding force of the transfer conveying device to the spring is considered, and the limitation of the spring separation to the friction force between the spring and the conveying chain is not considered. In the embodiment of the application, although a certain friction exists between the spring and the two first conveying chains, the friction is naturally caused by the fact that the spring must be compressed before bagging, and although the friction can assist the spring to separate from the transfer conveying device in an objective way, only the relation between the adsorption force of the magnetic piece on the spring and the holding force of the transfer conveying device on the spring can be considered when the spring is separated from the transfer conveying device. Thus, the maximum compression of the spring between the two first conveying baffles is only required to meet the design requirement of the bagged spring, and the requirement of the spring release on the compression (the friction force is positively related to the compression) is not required to be considered. Through changing the parameter of magnetic part, for example the magnetism size and the size of magnetic part and the magnetic part number, can conveniently change the adsorption affinity to the spring to change the adsorption affinity of magnetic part to the spring, ensure that the spring can break away from switching conveyor reliably, can guarantee from this that the biggest compression volume of spring satisfies the design requirement of pocket spring, also can guarantee that spring and switching conveyor break away from reliably, can not influence follow-up bagging-off, improved production efficiency. Moreover, the disengaging position of the spring between the two first conveying baffles is easily determined thanks to the provision of the magnetic element.

In some embodiments, the first conveyor chain has a plurality of protrusions on a surface thereof for gripping the spring to increase the holding force of the first conveyor chain on the spring. Therefore, the holding force of the first conveying chain to the spring can be increased, slipping between the spring and the chain is avoided, and the reliability of the first conveying chain for conveying the spring and the reliability of the spring separating from the switching conveying device are further improved.

In some embodiments, the protrusion is a catch plate assembled to the first conveyor chain, one end of the catch plate protruding from a surface of the first conveyor chain that contacts the spring.

In some embodiments, the bagging conveying device further comprises two second conveying chains and two second conveying baffles arranged on the rack, one second conveying chain is wound on one second conveying baffle, the other second conveying chain is wound on the other second conveying baffle, one second conveying baffle is arranged in front of one first conveying baffle, the rear end of the one second conveying baffle is adjacent to the front end of the one first conveying baffle, the other second conveying baffle is arranged in front of the other first conveying baffle, the rear end of the other second conveying baffle is adjacent to the front end of the other first conveying baffle, and the spring separated from the transferring conveying device is clamped by the two first conveying chains to be continuously conveyed between the two second conveying chains.

In some embodiments, the distance between two of the second conveying baffles is constant along the conveying direction.

In some embodiments, one of the first conveyor chains is the same chain as one of the second conveyor chains, and the other of the first conveyor chains is the same chain as the other of the second conveyor chains.

In some embodiments, the plurality of magnetic elements is arranged symmetrically with respect to the midline of the two first conveying baffles.

In some embodiments, the angle between two of the first conveying baffles is adjustable and/or one of the first conveying baffles is displaceable relative to the other first conveying baffle in a lateral direction orthogonal to the conveying direction.

In some embodiments, the magnetic member is disposed adjacent the front ends of the two first conveying baffles and the disengaged position of the spring from the transfer conveying device is adjacent the front ends of the first conveying baffles.

In some embodiments, the transfer conveying device comprises a transfer conveying belt, the transfer conveying belt is track-shaped and comprises a front arc-shaped section, a rear arc-shaped section, an upper straight section and a lower straight section, the upper straight section and the lower straight section are connected between the front arc-shaped section and the rear arc-shaped section, a plurality of magnetic attraction blocks used for being attracted to keep the springs are arranged on the transfer conveying belt at intervals, the transfer conveying belt operates so that the springs attracted by the magnetic attraction blocks in the lower straight section move between the two first conveying baffles and are compressed, and when the sum of the holding force of the two first conveying chains on the springs and the attraction force of the magnetic pieces on the springs is larger than the attraction force of the magnetic attraction blocks on the springs, the springs are separated from the magnetic attraction blocks and are clamped by the two first conveying chains to continue conveying along the conveying direction.

In some embodiments, the forward end of the lower straight section of the transfer conveyor belt is aligned with or rearward of the forward ends of the two first conveying flights.

The spring conveying device according to the embodiment of the second aspect of the present invention includes: a frame; a transfer conveyor; the bagging conveying device is used for bearing springs conveyed by the transfer conveying device and compressing the springs, the bagging conveying device comprises a magnetic part, two first conveying baffles and two first conveying chains, the two first conveying baffles are oppositely arranged on the rack, the two first conveying chains are correspondingly arranged on at least one of the rack and the two first conveying baffles in a winding mode, the magnetic part is arranged on at least one of the rack and the two first conveying baffles, the distance between the two first conveying baffles is gradually reduced from one end to the other end, the transfer conveying device is arranged above the two first conveying baffles, the transfer conveying device is used for conveying the springs to the position between the two first conveying baffles and is driven by the two first conveying chains to move from the position between the two first conveying baffles to the position between the two first conveying baffles, the distance between the two first conveying baffles is gradually reduced and gradually compressed, and after the springs are compressed to a certain extent, the transfer conveying force between the two first conveying chains and the two first conveying baffles keeps the transfer force of the springs to the first conveying device.

In some embodiments, the first conveyor chain has a plurality of protrusions on a surface thereof for increasing the holding force of the first conveyor chain on the spring.

In some embodiments, the bagging conveying device further comprises two second conveying chains and two second conveying baffles arranged on the rack, the distance between the two second conveying baffles is unchanged along the conveying direction, one second conveying chain is wound on one second conveying baffle, the other second conveying chain is wound on the other second conveying baffle, one second conveying baffle is arranged in front of one first conveying baffle, the rear end of the one second conveying baffle is adjacent to the front end of the one first conveying baffle, the rear end of the other second conveying baffle is adjacent to the front end of the other first conveying baffle, and the spring is clamped by the two first conveying chains to be continuously conveyed between the two second conveying chains forwards after being separated from the transfer conveying device.

Drawings

Fig. 1 is a schematic view of a spring delivery apparatus according to an embodiment of the present invention.

Fig. 2 is a partially enlarged view of the bagging conveyor according to the embodiment of the present invention.

Fig. 3 is a cross-sectional view of a bagging conveyor according to an embodiment of the present invention.

Fig. 4 is a schematic view of the structure of a chain of the bagging conveyor device according to the embodiment of the present invention.

Fig. 5 is a side view of a chain of a bagging conveyor according to an embodiment of the present invention.

Reference numerals:

the bagging conveying device 100, the first conveying baffle 1, the first conveying chain 2, the first chain row 21, the first chain plate 211, the clamping plate 212, the second chain row 22, the second chain plate 221, the chain pin 23, the roller 24, the magnetic piece 3, the bulge 4, the second conveying baffle 5, the second conveying chain 6, the transferring conveying device 200, the transferring conveying belt 201, the conveying seat 202 and the spring 300.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

The bagged spring production equipment according to the embodiment of the invention comprises a rack (not shown), a spring coiling machine (not shown) and a spring conveying device, wherein the spring coiling machine and the spring conveying device are arranged on the rack. The spring coiling machine makes the wire into helical spring, and spring conveyor can accept helical spring and conveying spring from spring coiling machine to bagging.

A spring conveyor of a pocketed spring production apparatus according to an embodiment of the present invention is described in detail below.

As shown in fig. 1-3, a spring delivery device according to some embodiments of the present invention includes a bagging delivery device 100 and a transfer delivery device 200. The transfer conveyor 200 receives the helical springs 300 from the spring coiler and transfers the springs 300 to the bagging conveyor 100. The bagging conveyor 100 receives the springs from the transfer conveyor 200 and continues to convey the springs into bags in the direction of conveyance of the springs 300 (back-to-front direction in fig. 1), and then performs solder packaging to make pocketed springs (i.e., strings of springs).

The spring 300 is shown in the conveying direction of the bagging conveyor 100 as a back-to-front direction in fig. 1. Here, it should be understood that the azimuth or positional relationship indicated by the terms "front", "rear", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.

As shown in fig. 1-3, the bagging conveyor 100 includes two first conveyor baffles 1, two first conveyor chains 2, and a magnetic member 3. Two first conveying baffles 1 are arranged on the frame, and the two first conveying baffles 1 are opposite to each other and are spaced apart. In other words, the two first conveying shutters 1 are each provided on the frame and are opposed to each other in the lateral direction orthogonal to the conveying direction of the spring 300. Here, the lateral direction is a direction orthogonal to the conveyance direction of the spring 300, i.e., a direction orthogonal to the front-rear direction.

Each first conveying baffle 1 is wound with a first conveying chain 2. In other words, one first conveying chain 2 is wound on one first conveying baffle 1, the other first conveying chain 2 is wound on the other first conveying baffle 1, and the two first conveying baffles 1 and the two first conveying chains 2 are arranged in a one-to-one correspondence.

The distance between the two first conveying baffles 1 gradually decreases in the conveying direction. In other words, the two first conveying fences 1 have a larger-distance head and a smaller-distance head, and the larger-distance head is at the rear ends of the two first conveying fences 1, and the smaller-distance head is at the front ends of the two first conveying fences 1. Here, it is to be understood that the distance between the two first conveying baffles 1 is the distance between the two first conveying baffles 1 in the lateral direction.

The transfer conveyor 200 is arranged above between the two first conveyor baffles 1, whereby the transfer conveyor 200 transfers the springs 300 between the two first conveyor baffles 1 of the bagging conveyor 100.

The magnetic member 3 is provided on at least one of the frame and the two first conveying shutters 1. In other words, the magnetic member 3 may be provided on the frame, on one or both of the two first conveyance baffles 1, or on the frame, on one or both of the two first conveyance baffles 1. In a specific embodiment, the magnetic members 3 are disposed on the two first conveying baffles 1 and symmetrically disposed with respect to a center line between the two first conveying baffles 1, and both ends of the spring 300 clamped between the two first conveying chains 2 may be attracted by the magnetic members 3.

The transfer conveyor 100 conveys the spring 300 between the two first conveying chains 2, and drives the spring 300 to move from a larger end to a smaller end of the distance between the two first conveying baffles 1 in the conveying direction, and the spring 300 is gradually compressed as the distance between the two first conveying baffles 1 gradually decreases when the spring 300 moves between the two first conveying baffles 1 in the conveying direction. When the spring 300 is compressed to a certain extent, the sum of the attraction force of the magnetic member 3 to the spring 300 and the holding force of the two first conveying chains 2 to the spring 300 is larger than the holding force of the transferring conveying device 200 to the spring 300, and the spring 300 is separated from the transferring conveying device 200 between the two first conveying baffles 1. It will be appreciated that the disengaged spring 300 is continuously conveyed forward by the first conveyor chain 2.

According to the spring conveying device and the bagged spring production equipment with the spring conveying device, as the magnetic piece 3 for adsorbing the spring is arranged on the first conveying baffle plate 1, the spring is separated from the transfer conveying device 200 through the adsorption force of the magnetic piece 3 to the spring 300 and the friction force between the two first conveying chains 2 and the spring 300. It will be appreciated that, since the first conveying chain 2 and the spring 300 are both metal members, the friction force therebetween is small, and as long as the attraction force of the magnetic member 3 to the spring 300 is greater than the holding force of the transferring conveying device 200 to the spring 300, the spring 300 can be separated from the transferring conveying device 200, and the magnitude of the friction force is generally not considered.

Those skilled in the art will appreciate that the springs need to be compressed a certain amount prior to bagging, which amount meets the design requirements of the pocketed springs. Under the premise that the maximum compression amount between the spring 300 and the two first conveying baffles 1 (namely, the compression amount of the end, with a smaller distance between the two first conveying baffles 1, of the spring 300) meets the design requirement of the bagged spring (thereby, the maximum friction force between the spring 300 and the first conveying chain 2 is determined), the adsorption force on the spring 300 can be changed by changing the parameters of the magnetic piece 3, such as the magnetic size of the magnetic piece 3, so that the requirement that the spring is separated from the transfer conveying device is met, the maximum compression amount of the spring 300 can be guaranteed to meet the design requirement of the bagged spring, the spring 300 can be guaranteed to be reliably separated from the transfer conveying device 200, subsequent bagging is not influenced, and the production efficiency is improved. Moreover, the disengaging position of the spring 300 between the two first conveying shutters 1 is easily determined, thanks to the provision of the magnetic member 3.

In some embodiments, as shown in fig. 1 and 3, the magnetic member 3 is disposed adjacent to the front ends of the two first conveying baffles 1, and the disengaged position of the spring 300 from the transfer conveying device 200 is adjacent to the front ends of the first conveying baffles 1. In other words, the magnetic member 3 is disposed adjacent to the front end surface of the first conveying shutter 1, and the spring 300 is separated from the transfer conveyor 200 at the position where the magnetic member 3 is disposed.

In some embodiments, the magnetic member 3 is provided in plurality, and the plurality of magnetic members 3 are symmetrically disposed with respect to the center line of the two first conveying shutters 1. For example, in a specific embodiment, two magnetic members 3 are provided, and the two magnetic members 3 are symmetrically disposed with respect to the center line of the two first conveying shutters 1, in other words, one magnetic member 3 is provided on one first conveying shutter 1, the other magnetic member 3 is provided on the other conveying shutter 1, and the two magnetic members 3 are disposed opposite in the lateral direction. Here, it is to be understood that the meaning of "plurality" is at least two, for example, two, three, etc., unless explicitly defined otherwise.

In some embodiments, the magnetic element 3 on one first transport barrier 1 is provided on a side of the one first transport barrier 1 adjacent to the other first transport barrier 1, and the magnetic element 3 on the other first transport barrier 1 is provided on a side of the other first transport barrier 1 adjacent to the one first transport barrier 1. In other words, the magnetic members 3 on the two first conveying fences 1 are each disposed adjacent to the spring 300 between the two first conveying fences 1, whereby the attraction of the magnetic members 3 to the ends of the spring 300 is further improved. Alternatively, the magnetic member 3 may be provided on the frame.

In some embodiments, as shown in fig. 2, the first conveyor chain 2 has a plurality of protrusions 4 on its surface, the protrusions 4 being used to retain the springs 300 to increase the holding force of the first conveyor chain 2 on the springs 300. Here, it is to be understood that the holding force of the first conveyor chain 2 against the spring 300 is to be understood as a resultant of the frictional force of the first conveyor chain 2 against the spring 300 and the holding force of the projections 4 on the surface of the first conveyor chain 2 against the end of the spring 300. In this embodiment, by having the protrusions 4 on the surface of the first conveying chain 2, the holding force of the first conveying chain 2 to the spring 300 is increased, slipping between the spring 300 and the chain is avoided, the reliability of conveying the spring 300 by the first conveying chain 2 is further improved, and the urging force to the spring 300 when the spring 300 is disengaged from the transferring conveying device 200 can be increased, so that the disengagement of the spring 300 is more reliable.

In some embodiments, the protrusion 4 is a card 212 assembled to the first conveyor chain 2, and one end of the card 212 protrudes from the surface of the first conveyor chain 2 that contacts the spring 300. Here, it is to be understood that when the spring 300 is clamped between the two first conveying chains 2, the surface of the first conveying chain 2 that the end of the spring 300 can contact may be referred to as a conveying surface of the first conveying chain 2, and thus the card 212 protrudes from the conveying surface of the first conveying chain 2.

In some specific embodiments, as shown in fig. 4 and 5, the first conveyor chain 2 includes a plurality of first chain rows 21, a plurality of second chain rows 22, and a plurality of chain pins 23. The plurality of first link columns 21 are arranged at intervals along the length direction of the chain, the plurality of second link columns 22 are arranged at intervals along the length direction of the chain, the first link columns 21 and the second link columns 22 are alternately arranged along the length direction of the chain, namely, one second link column 22 is arranged between adjacent first link columns 21, each first link column 21 comprises a plurality of first link plates 211, the plurality of first link plates 211 are spaced apart along the width direction of the chain, each second link column 22 comprises a plurality of second link plates 221, the second link plates 221 are spaced apart along the width direction of the chain, namely, the right end of one first link column 21 is connected with the left end of one second link column 22, the right end of the other first link column 21 is connected with the left end of the other second link column 22, and so on, the right end of the other first link columns 21 and the second link columns 22 are alternately arranged along the length direction of the chain.

The chain pins 23 connect the first chain row 21 and the second chain row 22 adjacent to each other in the length direction of the chain, and it is understood that one chain pin 23 sequentially passes through the right end of one first link plate 211 in one first chain row 21, the left end of one second link plate 221 in one second chain row 22, one roller 24, the left end of the other second link plate 221 in one second chain row 22, and the right end of the other first link plate 211 in one first chain row 21, and the other chain pin 23 sequentially passes through the left end of one first link plate 211 in the other first chain row 21, the right end of the other second link plate 221 in one second chain row 22, the right end of the other roller 24, the other second link plate 221 in one second chain row 22, and the left end of the other first link plate 211 in the other first chain row 21, and so on, and the connection of the adjacent first chain row 21 and the second chain row 22 to each other is achieved by the plurality of chain pins 23.

The card 212 is assembled to at least one of the first chain row 21 and the second chain row 22, in other words, only the first chain row 21 may include the card 212, only the second chain row 22 may include the card 212, and both the first chain row 21 and the second chain row 22 may include the card 212. In the embodiment shown in fig. 4 and 5, only the first chain row 21 includes the card plates 212, in other words, the first chain row 21 includes the first link plates 211 and the card plates 212, one card plate 212 is sandwiched between two adjacent first link plates 211, and the card plates 212 and the first link plates 211 are disposed in superposition with each other.

Here, it should be understood that the terms "connected," "connected," and the like may be fixedly connected, detachably connected, or integrated unless explicitly stated and defined otherwise; may be directly connected or indirectly connected through an intermediary unless explicitly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The clamping plate 212 has lugs thereon, which protrude from the conveying surface of the first conveying chain 2, on which lugs the ends of the springs 300 can be clamped when the springs 300 are compressed to some extent between the two first conveying flights 1, the combined forces of the clamping forces of the springs 300 on the lugs and the friction forces between the springs 300 and the conveying surface forming the holding forces of the springs 300 by the two first conveying chains 2. In some embodiments, the card 7 is provided with two lugs, and the two lugs are symmetrically disposed at both ends of the card 212.

Here, it is to be understood that the catch plate 212 is a part constituting the conveying chain, and the present invention is not limited thereto, and for example, the projection 4 may be integrally formed on the link plate. Also, the protrusion 4 may be in the shape of a catching protrusion, a hook, and the present invention is not limited thereto, and a person skilled in the art may determine the shape of the protrusion 4 according to actual situations, as long as the protrusion 4 protrudes from the conveying surface of the conveying chain and may catch the end of the spring.

In some embodiments, as shown in fig. 1, the bagging conveyor 100 further includes two second conveying baffles 5 and two second conveying chains 6, the two second conveying baffles 5 being disposed opposite to each other on the frame. In other words, the two second conveying shutters 5 are both provided on the frame and are opposed to each other in the lateral direction orthogonal to the conveying direction of the spring 300.

The two second conveying shutters 5 are opposed to each other and spaced apart in the lateral direction orthogonal to the conveying direction of the spring 300. The first conveying baffle plate 1 and the second conveying baffle plate 5 are sequentially arranged along the direction from back to front, the two first conveying baffle plates 1 and the two second conveying baffle plates 5 are arranged in a one-to-one correspondence manner, and the rear end of the second conveying baffle plate 5 is adjacent to the front end of the corresponding first conveying baffle plate 1. In other words, one second conveying baffle 5 is provided in front of one first conveying baffle 1, and the rear end of the one second conveying baffle 5 is adjacent to the front end of the one first conveying baffle 1; the other second conveying baffle 5 is provided in front of the other first conveying baffle 1, and the rear end of the other second conveying baffle 5 is adjacent to the front end of the other first conveying baffle 1. Here, it should be understood that "adjacent" is that the rear end of the front one of the baffles and the front end of the rear one of the baffles are not too far apart, may be in contact, or may be spaced apart by a small distance.

Each second conveying baffle plate 5 is wound with a second conveying chain 6, that is, one second conveying chain 6 is wound on one second conveying baffle plate 5, the other second conveying chain 6 is wound on the other second conveying baffle plate 5, and the spring 300 separated from the transfer conveying device 200 is continuously conveyed forward between the two second conveying chains 6 by the two first conveying chains 2 and is clamped by the two second conveying chains 6 to be continuously conveyed forward.

In this embodiment, the bagging conveyor 100 includes two first conveyor baffles 1, two first conveyor chains 2, two second conveyor baffles 5, and two second conveyor chains 6, the two first conveyor baffles 1 and the two first conveyor chains 2 constitute the rear section of the bagging conveyor 100, the two second conveyor baffles 5 and the two second conveyor chains 6 constitute the front section of the bagging conveyor 100, with the transit conveyor 200 being located above the front section, and the springs 300 conveyed by the transit conveyor 200 are disengaged from the transit conveyor 200 in the rear section and continue to be gripped by the two first conveyor chains 2 and conveyed between the two second conveyor chains 6.

In some embodiments, the distance between the two second conveying baffles 5 remains unchanged along the conveying direction of the spring 300, in other words, the two second conveying baffles 5 are arranged parallel to each other and spaced apart. Here, it is to be understood that the distance between the two second conveyance baffles 5 is the distance between the two second conveyance baffles 5 in the lateral direction.

In some embodiments, one first conveyor chain 2 is the same chain as one second conveyor chain 6, and the other first conveyor chain 2 is the same chain as the other second conveyor chain 6. In other words, the first conveying chain 2 and the second conveying chain 6 corresponding thereto are a single chain which is wound around the first conveying flapper 1 and the second conveying flapper 5 corresponding to the first conveying flapper 1.

In some embodiments, the included angle between the two first conveying baffles 1 is adjustable, in this embodiment, by adjusting the included angle between the two first conveying baffles 1, springs of different types can be used, and the applicability of the bagging conveying device is improved.

In some embodiments, at least one of the two first conveying baffles 1 is displaceable in a lateral direction orthogonal to the conveying direction of the springs 300, in other words, one first conveying baffle 1 is displaceable in a lateral direction with respect to the other first conveying baffle 1, and/or the other first conveying baffle 1 is displaceable in a lateral direction with respect to the one first conveying baffle to change the spacing between the two first conveying baffles 1 in the lateral direction to accommodate springs 300 of different lengths. In some particular embodiments, at least one of the two second conveying flights 5 is displaceable in a lateral direction orthogonal to the conveying direction of the springs 300 to adjust the spacing between the two second conveying flights 5 in the lateral direction. Here, it is to be understood that "displacement" is defined as the movement of the transport barrier from one position to another and can be fixed.

In some embodiments, as shown in fig. 1, the transfer conveyor 200 includes a transfer conveyor belt 201, the transfer conveyor belt 201 is track-shaped, and the transfer conveyor belt 201 includes a front arc-shaped section, a rear arc-shaped section, an upper straight section, and a lower straight section, wherein the upper straight section and the lower straight section are both connected between the front arc-shaped section and the rear arc-shaped section, and the upper straight section is located above the lower straight section.

The transfer conveyor belt 201 is provided with a plurality of conveying seats 202 for positioning the springs 300, the plurality of conveying seats 202 are uniformly arranged at intervals along the circumferential direction of the transfer conveyor belt 201, the conveying seats 202 are provided with magnetic attraction blocks (not shown), the magnetic attraction blocks can attract to keep the springs 300, the transfer conveyor belt 201 operates to enable the springs 300 attracted by the magnetic attraction blocks in the lower straight section to move between the two first conveying baffle plates 1 and be gradually compressed, and when the sum of the holding force of the two first conveying chains 2 to the springs 300 and the attraction force of the magnetic pieces 3 to the springs 300 is larger than the attraction force of the magnetic attraction blocks to the springs 300, the springs 300 are separated from the magnetic attraction blocks of the transfer conveyor device 200 and are clamped by the two first conveying chains 2 to continue conveying along the conveying direction of the springs 300.

In this embodiment, each carriage 202 may be attracted to a spring 300 delivered by a spring coiler and transported by transfer conveyor 201. The magnetic adsorption mode is adopted, the structure is simple, and the transfer from the spring coiling machine and the transfer from the transfer conveying device 200 to the bagging conveying device 100 are simple and convenient. In other embodiments, the transfer conveyor 200 is not limited to being in the form of a conveyor belt, for example, the transfer conveyor 200 may be in the form of a conveyor chain or conveyor wheel.

In some particular embodiments, the front end of the lower straight section of the transfer conveyor belt 201 is aligned with the front ends of the two first conveyor baffles 1, or the front end of the lower straight section is located rearward of the front ends of the two first conveyor baffles 1. In this embodiment, by defining the position of the lower straight section relative to the first delivery baffle 1, the spring 300 can be facilitated to disengage the transfer conveyor 200 between the two first delivery baffles 1.

A pocketed spring production apparatus according to an embodiment of the present invention is described below with reference to fig. 1 to 5.

As shown in fig. 1 to 5, the pocket spring production apparatus according to the embodiment of the present invention includes a frame (not shown), a spring coiling machine (not shown) that makes a wire into a spiral spring, and a spring conveying device that receives the spiral spring and conveys the spring from the spring coiling machine.

The spring conveying device comprises a bagging conveying device 100 and a transferring conveying device 200, wherein the transferring conveying device 200 receives a spiral spring 300 from a spring coiling machine and conveys the spring 300 to the bagging conveying device 100, and the bagging conveying device 100 receives the spring conveyed by the transferring conveying device 200 and continuously conveys the spring along the conveying direction.

The bagging conveyor 100 comprises two first conveyor baffles 1, two first conveyor chains 2, two magnetic members 3, two second conveyor baffles 5 and two second conveyor chains 6. Two first conveying shutters 1 and two second conveying shutters 5 are provided on the frame, the two first conveying shutters 1 being opposite to and spaced apart from each other in a lateral direction orthogonal to the conveying direction of the spring 300, and the two second conveying shutters 5 being opposite to and spaced apart from each other in a lateral direction orthogonal to the conveying direction of the spring 300. The first conveying baffle plate 1 and the second conveying baffle plate 5 are sequentially arranged along the direction from back to front, the two first conveying baffle plates 1 and the two second conveying baffle plates 5 are arranged in one-to-one correspondence, and the front end of the first conveying baffle plate 1 is adjacent to the rear end of the second conveying baffle plate 5 corresponding to the front end of the first conveying baffle plate. Each first conveying baffle plate 1 is wound with a first conveying chain 2, in other words, one first conveying chain 2 is wound on one first conveying baffle plate 1, and the other first conveying chain 2 is wound on the other first conveying baffle plate 1; each second conveying baffle 5 is wound with a second conveying chain 6, in other words, one second conveying chain 6 is wound on one second conveying baffle 5, and the other second conveying chain 6 is wound on the other second conveying baffle 5.

The distance between the two first conveying baffles 1 gradually decreases in the conveying direction from the rear to the front, in other words, the two first conveying baffles 1 have a larger-distance end and a smaller-distance end therebetween, and the larger-distance end is at the rear end of the first conveying baffle 1 and the smaller-distance end is at the front end of the first conveying baffle 1. The distance between the two second conveying shutters 5 remains unchanged in the conveying direction of the spring 300.

The two magnetic pieces 3 are respectively arranged on the two first conveying baffles 1, the two magnetic pieces 3 are symmetrically arranged relative to the central line of the channel between the two first conveying baffles 1, the two magnetic pieces 3 are respectively arranged adjacent to the front ends of the two first conveying baffles 1, the magnetic piece 3 on one first conveying baffle 1 is arranged on one side of the one first conveying baffle 1 adjacent to the other first conveying baffle 1, and the magnetic piece 3 on the other first conveying baffle 1 is arranged on one side of the other first conveying baffle 1 adjacent to the one first conveying baffle 1.

One first conveying chain 2 and one second conveying chain 6 corresponding to the first conveying chain are the same chain, and the other first conveying chain 2 and the other second conveying chain 6 are the same chain. Each chain comprises a plurality of first chain rows 21, a plurality of second chain rows 22 and a plurality of chain pins 23. The first chain rows 21 are arranged at intervals along the length direction of the chain, the second chain rows 22 are arranged at intervals along the length direction of the chain, the first chain rows 21 and the second chain rows 22 are arranged alternately along the length direction of the chain, namely, one second chain row 22 is arranged between every two adjacent first chain rows 21, each first chain row 21 comprises a plurality of first chain plates 211 and a plurality of clamping plates 212, the plurality of first chain plates 211 are spaced apart along the width direction of the chain, one clamping plate 212 is clamped between two adjacent first chain plates 211, and the clamping plates 212 and the first chain plates 211 are arranged in a superposed mode. The clamping plate 212 is provided with lugs which protrude from the surface of the first conveying chain 2, which is in contact with the springs 300, namely the lugs protrude from the conveying surface of the first conveying chain 2, and two lugs are arranged at two ends of the clamping plate 212 symmetrically.

Each second link row 22 includes a plurality of second link plates 221, the second link plates 221 being spaced apart in the chain width direction, i.e., the right end of one first link row 21 being connected to the left end of one second link row 22, the right end of the second link row 22 being connected to the left end of another first link row 21, the right end of the other first link row 21 being connected to the left end of another second link row 22, and so on, being formed alternately along the length direction of the chain along the first link row 21 and the second link row 22. The chain pins 23 connect the first chain row 21 and the second chain row 22 adjacent to each other in the length direction of the chain, and it is understood that one chain pin 23 sequentially passes through the right end of one first link plate 211 in one first chain row 21, the left end of one second link plate 221 in one second chain row 22, one roller 24, the left end of the other second link plate 221 in one second chain row 22, and the right end of the other first link plate 211 in one first chain row 21, and the other chain pin 23 sequentially passes through the left end of one first link plate 211 in the other first chain row 21, the right end of the other second link plate 221 in one second chain row 22, the right end of the other roller 24, the other second link plate 221 in one second chain row 22, and the left end of the other first link plate 211 in the other first chain row 21, and so on, and the connection of the adjacent first chain row 21 and the second chain row 22 to each other is achieved by the plurality of chain pins 23.

The clamp between the two first conveying baffles 1 is adjustable so as to be applicable to springs of different types and improve applicability. At least one of the two first conveying shutters 1 is displaceable in a lateral direction orthogonal to the conveying direction of the spring 300 to adjust a spacing between the two first conveying shutters 1 in the lateral direction. At least one of the two second conveying shutters 5 is displaceable in a lateral direction orthogonal to the conveying direction of the spring 300 to adjust a spacing between the two second conveying shutters 5 in the lateral direction.

The transfer conveying device 200 comprises a transfer conveying belt 201, the transfer conveying belt 201 is in a runway shape, the transfer conveying belt 201 comprises a front arc-shaped section, a rear arc-shaped section, an upper straight section and a lower straight section, wherein the upper straight section and the lower straight section are connected between the front arc-shaped section and the rear arc-shaped section, the upper straight section is located above the lower straight section, and the transfer conveying device 200 is arranged above the two first conveying baffles 1. The front ends of the lower straight sections of the transfer conveyor belt 201 are aligned with the front ends of the two first conveying flights 1, or the front ends of the lower straight sections are located rearward of the front ends of the two first conveying flights 1.

The transfer conveyor belt 201 is provided with a plurality of conveying seats 202 for positioning the springs 300, the plurality of conveying seats 202 are uniformly arranged at intervals along the circumferential direction of the transfer conveyor belt 201, the conveying seats 202 are provided with magnetic attraction blocks (not shown), the magnetic attraction blocks can attract to keep the springs 300, the transfer conveyor belt 201 operates so that the springs 300 attracted by the magnetic attraction blocks in the lower straight section move between the two first conveying baffles 1 along the conveying direction of the springs 300 from one end with larger distance between the two first conveying baffles 1 to one end with smaller distance between the two first conveying baffles 1, when the springs 300 move along the conveying direction of the springs 300, the springs 300 are gradually compressed along with the gradual decrease of the distance between the two first conveying baffles 1, when the springs 300 are compressed to a certain extent, and when the sum of the holding force of the two first conveying chains 2 to the springs 300 and the attraction force of the magnetic pieces 3 to the springs 300 is larger than the attraction force of the magnetic attraction blocks to the springs 300, the springs 300 are separated from the magnetic attraction blocks between the two first conveying baffles 1 and adjacent to the front ends of the two first conveying baffles 1, and the two first conveying chains 2 continue to clamp the two conveying chains 6 along the conveying directions.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A pocketed spring production apparatus, comprising:

A frame;

the spring coiling machine is used for manufacturing the metal wire into a spiral spring;

the spring conveying device comprises a transfer conveying device and a bagging conveying device, the transfer conveying device is used for receiving the springs from the spring coiling machine, the bagging conveying device is used for receiving the springs from the transfer conveying device and conveying the springs along a conveying direction, the bagging conveying device comprises a magnetic piece, two first conveying chains and two first conveying baffles arranged on the frame, one first conveying chain is wound on one first conveying baffle, the other first conveying chain is wound on the other first conveying baffle, the distance between the two first conveying baffles is gradually reduced along the conveying direction, the transfer conveying device is arranged above the two first conveying baffles, and the magnetic piece is arranged on at least one of the frame and the two first conveying baffles;

the transfer conveying device conveys the spring between the two first conveying chains and drives the spring to move from one end with a larger distance between the two first conveying baffles to one end with a smaller distance along the conveying direction, the spring is gradually compressed along with gradually decreasing distance between the two first conveying baffles when moving along the conveying direction between the two first conveying baffles, and the spring is separated from the transfer conveying device between the two first conveying baffles when the sum of the holding force of the two first conveying chains on the spring and the adsorption force of the magnetic piece on the spring is larger than the holding force of the transfer conveying device on the spring;

The surface of the first conveying chain is provided with a plurality of protrusions for clamping the spring to increase the holding force of the first conveying chain on the spring;

the protrusion is a clamping plate assembled on the first conveying chain, and one end of the clamping plate protrudes out of the surface of the first conveying chain, which is contacted with the spring;

the bagging conveying device further comprises two second conveying chains and two second conveying baffles arranged on the frame, one second conveying chain is wound on one second conveying baffle, the other second conveying chain is wound on the other second conveying baffle, one second conveying baffle is arranged in front of one first conveying baffle, the rear end of the one second conveying baffle is adjacent to the front end of the one first conveying baffle, the other second conveying baffle is arranged in front of the other first conveying baffle, the rear end of the other second conveying baffle is adjacent to the front end of the other first conveying baffle, and the spring separated from the switching conveying device is continuously conveyed forward between the two second conveying chains by the two first conveying chains.

2. The pocketed spring production apparatus according to claim 1, wherein a distance between two said second conveying baffles is constant along said conveying direction.

3. The pocketed spring production apparatus according to claim 1, wherein one of said first conveying chains and one of said second conveying chains are the same chain, and the other of said first conveying chains and the other of said second conveying chains are the same chain.

4. The pocketed spring production apparatus according to claim 1, wherein said magnetic member is plural, and plural said magnetic members are symmetrically disposed with respect to a center line of two said first conveying shutters.

5. A pocketed spring production apparatus according to claim 1, wherein the angle between two said first conveying baffles is adjustable and/or one said first conveying baffle is displaceable relative to the other first conveying baffle in a transverse direction orthogonal to said conveying direction.

6. The pocketed spring production apparatus according to claim 1, wherein said magnetic member is disposed adjacent to front ends of two of said first conveying shutters and a disengaged position where said spring is disengaged from said transfer conveyor is adjacent to front ends of said first conveying shutters.

7. The production facility of pocketed springs according to any one of claims 1 to 6, wherein said transfer conveyor comprises a transfer conveyor belt, said transfer conveyor belt being race track-shaped and comprising a front arcuate section and a rear arcuate section and an upper flat section and a lower flat section connected between said front arcuate section and said rear arcuate section, a plurality of magnetic attraction blocks for attracting to hold said springs are provided at intervals on said transfer conveyor belt, said transfer conveyor belt being operated such that said springs attracted by said magnetic attraction blocks in said lower flat section are moved between said two first conveyor shutters and compressed, said springs being disengaged from said magnetic attraction blocks and being held by said two first conveyor chains to continue conveying in a conveying direction when a sum of holding forces of said two first conveyor chains to said springs and an attracting force of said magnetic pieces to said springs is greater than an attracting force of said magnetic attraction blocks to said springs.

8. The pocketed spring production apparatus according to claim 7, wherein a front end of said lower straight section of said transfer conveyor belt is aligned with or behind front ends of said two first conveying baffles.

9. A spring delivery apparatus, comprising:

a frame;

a transfer conveyor;

a bagging conveying device which receives and compresses the springs conveyed by the transfer conveying device, wherein the bagging conveying device comprises a magnetic part, two first conveying baffles which are oppositely arranged on the frame and two first conveying chains which are correspondingly wound on the two first conveying baffles, the magnetic part is arranged on at least one of the frame and the two first conveying baffles, the distance between the two first conveying baffles is gradually reduced from one end to the other end, the transfer conveying device is arranged above the space between the two first conveying baffles, the transfer conveying device conveys the springs to the space between the two first conveying baffles and drives the springs to move from one end with larger distance between the two first conveying baffles to one end with smaller distance between the two first conveying baffles, the springs are gradually compressed with the gradual reduction of the distance between the two first conveying baffles when moving between the two first conveying baffles, and the transfer conveying device is kept to be in high transfer force with respect to the springs by the first chains after the springs are compressed to a certain extent;

The surface of the first conveying chain is provided with a plurality of bulges for increasing the holding force of the first conveying chain on the spring;

the bagging and conveying device further comprises two second conveying chains and two second conveying baffles arranged on the frame, the distance between the two second conveying baffles is unchanged along the conveying direction, one second conveying chain is wound on one second conveying baffle, the other second conveying chain is wound on the other second conveying baffle, one second conveying baffle is arranged in front of one first conveying baffle, the rear end of the one second conveying baffle is adjacent to the front end of the one first conveying baffle, the other second conveying baffle is arranged in front of the other first conveying baffle, the rear end of the other second conveying baffle is adjacent to the front end of the other first conveying baffle, and after the spring is separated from the switching conveying device, the spring is clamped by the two first conveying chains and continuously conveyed between the two second conveying chains.

10. The spring conveyor apparatus of claim 9 wherein one of the first conveyor chains is the same chain as one of the second conveyor chains and the other of the first conveyor chains is the same chain as the other of the second conveyor chains.

11. The spring conveyor of claim 9, wherein said magnetic elements are a plurality of said magnetic elements symmetrically disposed about a centerline of two of said first conveyor baffles.

12. The spring conveyor as claimed in any one of claims 9-11, wherein the transfer conveyor comprises a transfer conveyor belt, the transfer conveyor belt is track-shaped and comprises a front arc-shaped section, a rear arc-shaped section, an upper straight section and a lower straight section, wherein the upper straight section and the lower straight section are connected between the front arc-shaped section and the rear arc-shaped section, a plurality of magnetic attraction blocks for attracting to keep the springs are arranged on the transfer conveyor belt at intervals, the transfer conveyor belt operates so that the springs attracted by the magnetic attraction blocks in the lower straight section move between the two first conveyor baffles and are compressed, and when the sum of the holding force of the two first conveyor chains to the springs and the attraction force of the magnetic pieces to the springs is larger than the attraction force of the magnetic attraction blocks to the springs, the springs are separated from the magnetic attraction blocks and are clamped by the two first conveyor chains to continue conveying along the conveying direction.