CN214667519U

CN214667519U - Compression spring elasticity detects structure

Info

Publication number: CN214667519U
Application number: CN202120642551.3U
Authority: CN
Inventors: 袁文军
Original assignee: Hilite Automotive Systems Changshu Co ltd
Current assignee: Hilite Automotive Systems Changshu Co ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-11-09
Anticipated expiration: 2031-03-30

Abstract

The utility model discloses a compression spring elasticity detection structure, which comprises an upper pressure plate and a lower pressure plate which are opposite, an annular cushion block for controlling the pressing height of the upper pressure plate, a support ring which is opposite to the annular cushion block in a matching way, a force sensor connected with a display instrument, and a base; the annular cushion block is fixedly connected to the upper pressure plate, the axis of the annular cushion block is parallel to the axis of the upper pressure plate, the inner diameter of the annular cushion block and the inner diameter of the support ring are both larger than the outer diameter of the lower pressure plate, and a containing groove matched with the shape structure of the force sensor is formed in the lower end face of the support ring; the force sensor and the support ring are both fixedly arranged on the base, and the force sensor is correspondingly positioned in the accommodating groove of the support ring; the lower pressure plate is fixedly connected with the force sensor and is higher than the support ring. By the mode, the utility model can eliminate the compression length error introduced by the included angle between the direction of the height scale and the normal line of the pressure plate; and when the operator applies pressure, only the reaction force of the compressed spring acts on the force sensor.

Description

Compression spring elasticity detects structure

Technical Field

The utility model relates to a compression spring elasticity detects technical field, especially relates to a compression spring elasticity detects structure.

Background

The compression spring provides elastic force which changes within a certain range when the compression spring is compressed to a specified length, and the elastic force is one of important function indexes of the compression spring. Therefore, the compression spring needs to be detected quickly by using a detection device and used in a grading way.

The traditional spring machine mainly comprises an upper pressure plate, a lower pressure plate (base), a displacement sensor (electronic ruler), a force sensor, a driving transmission device, a stand column and other key mechanisms.

The existing SDHT series spring machine of the Larson company in the United states has the following disadvantages in the using process:

1. since the limiting mechanism is fixedly mounted on the turntable shaft (the turntable shaft which drives the rack to move up and down), when the limiting mechanism collides with the stop pin (the stop pin which is matched with the limiting mechanism to work), the deviation opposite to the collision direction often occurs.

2. Due to the existence of a mechanical movable gap in the stop pin mechanism, the position of the limiting mechanism can deviate in the locking process of the fixing bolt, the preloading cannot be completely accurate, and the force applied by an operator on a handle (a handle pressed by a driving pressure head) can not be reproduced, so that the position of the limiting mechanism is difficult to be accurate to 0.01mm when preset.

3. In order to ensure the parallelism between the upper pressure plate and the lower pressure plate, after the upper pressure plate fixed on the rack mechanism is adjusted, a normal line of a pressure plate plane and a grating ruler (which cannot be adjusted) fixed on the rack mechanism form a certain angle, so that the axis of the spring and the grating ruler form a certain angle during detection, and the measurement error of the compression length is caused.

In the PG-A-5 spring machine of Shenzhenxin Techang, the deformation of an I-type sensor or a commonly used S-type sensor in a measuring range is about 0.1-0.2mm, and after a length scale is calibrated between an upper pressure plate and a lower pressure plate by using a standard gauge block, the compression length error caused by the deformation of the sensor under the condition of variable load in actual work is difficult to ignore in the measurement of a precise spring. The linear guide rail and the normal lines of the upper pressure plate and the lower pressure plate form an included angle, so that an error exists between the display compression length of the spring and an actual value.

In the existing SD-50 spring machine of Wenzhou mountain company, a stand column is fastened and connected with a base through a bolt, and the instrument frame is poor in rigidity and generates large deformation when a handle is pressed down during detection, so that the influence of the operation force of a user on a detection result is large.

In summary, in practical use of the spring machine in the market, the detection of the precision spring often shows a large measurement deviation due to the parallelism error of the upper and lower press disks, the rigidity of the device structure, the rigidity of the sensor, the installation and calibration error of the electronic ruler, and the like.

SUMMERY OF THE UTILITY MODEL

The utility model mainly solves the technical problem of providing a compression spring elasticity detection structure, which can eliminate the compression length error introduced by the included angle between the direction of a height scale and the normal line of a pressure plate by using an annular cushion block and directly applying the pressure of a compression spring from the direction coaxial with the axis of an upper pressure plate; by means of the support ring corresponding to the annular pad, the pressure exerted by the operator is made to act entirely on the support structure, only the reaction force of the spring when compressed acting on the force sensor.

In order to solve the technical problem, the utility model discloses a technical scheme be: provided is a compression spring force detection structure including: the device comprises an upper pressure plate, a lower pressure plate, an annular cushion block, a support ring, a force sensor and a base, wherein the upper pressure plate and the lower pressure plate are opposite, the annular cushion block is used for controlling the pressing height of the upper pressure plate, the support ring is opposite to the annular cushion block in a matched mode, and the force sensor is connected with a display instrument; the annular cushion block is fixedly connected to the lower surface of the upper pressure plate, the axis of the annular cushion block is parallel to the axis of the upper pressure plate, and the inner diameter of an upper round hole of the annular cushion block is larger than the outer diameter of the lower pressure plate; the inner diameter of an annular hole in the support ring is larger than the outer diameter of the lower pressure plate, a containing groove matched with the shape structure of the force sensor is formed in the lower end face of the support ring, and the containing groove is communicated with the annular hole; the force sensor and the support ring are both fixedly arranged on the base, and the force sensor is correspondingly positioned in the accommodating groove of the support ring; the lower pressure plate is positioned in the annular hole of the support ring, the lower pressure plate is fixedly connected with the force sensor, and the upper surface of the lower pressure plate is higher than the upper end surface of the support ring.

Preferably, the force sensor is provided with a vertical threaded connecting rod which is oppositely positioned in an annular hole of the support ring; the bottom of lower pressure disk is equipped with the screw hole with threaded connection pole assorted, lower pressure disk with force sensor passes through threaded connection.

Preferably, the force sensor is a strain gauge sensor.

Preferably, the base is provided with a plurality of mounting slots for the first bolts to pass through.

Preferably, the number of the mounting slotted holes is two, and the two mounting slotted holes are respectively positioned on two sides of the base; the mounting groove hole comprises a first opening groove for the screw rod part on the first bolt to pass through and a second opening groove for accommodating the screw cap part on the first bolt, and the first opening groove and the second opening groove are both in U shapes.

Preferably, it is applied to manual presses of cast iron; the upper pressure plate is fixedly arranged on a pressing mechanism of the cast iron manual press, and the base is fixedly arranged on a lower reference surface of the cast iron manual press.

Preferably, the upper pressing plate is fixedly installed on an automatic high-speed reciprocating pressing system and is provided with an automatic feeding plate, a feeding and discharging mechanism or a multi-station rotating plate.

Preferably, the upper pressure plate is provided with a connecting shaft for fixedly matching with the lower pressing mechanism.

The utility model has the advantages that: the utility model can apply the pressure of the compression spring directly from the direction coaxial with the axis of the upper pressure plate by using the annular cushion block, thereby eliminating the compression length error introduced by the included angle between the direction of the height scale and the normal line of the pressure plate; by means of the support ring corresponding to the annular pad, the pressure exerted by the operator is made to act entirely on the support structure, only the reaction force of the spring when compressed acting on the force sensor. The structural design of the base mounting groove hole ensures that the base is simple and easy to fix and mount, the dust at the fixed connection part is convenient to clean, the position precision is high after the base is fixed and mounted, and the processing is easy. And a high-rigidity strain sensor is selected, so that the deformation range in a full range is only 2um, the compression length error caused by the deformation of the sensor is eliminated, and the detection precision is further improved. The rigidity of the whole system is ensured by using a small-sized cast iron manual press. The upper pressure plate is fixedly arranged on an automatic high-speed reciprocating pressing system and is provided with an automatic feeding plate, or a feeding and discharging mechanism, or a multi-station turntable, so that high-speed automatic grading of spring elasticity can be realized.

Drawings

Fig. 1 is a schematic cross-sectional structural view of a compression spring elasticity detection structure of the present invention;

fig. 2 is a schematic perspective view of the elasticity detection structure of the compression spring according to the present invention;

fig. 3 is a schematic view of a top view structure of the elastic force detection structure of the compression spring of the present invention.

The parts in the drawings are numbered as follows: 1. an upper platen; 2. an annular cushion block; 21. a circular hole; 3. a lower platen; 4. a support ring; 41. annular ring; 42. accommodating grooves; 5. a force sensor; 6. a base; 61. mounting a slotted hole; 611. a first open slot; 612. a second open slot.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Referring to fig. 1 to 3, an embodiment of the present invention includes:

a compression spring force detection structure, comprising: the device comprises an upper pressure plate 1, an annular cushion block 2, a lower pressure plate 3, a support ring 4, a force sensor 5 and a base 6.

The base 6 is provided with two mounting slotted holes 61 for being fixedly connected with a press, and the two mounting slotted holes 61 are respectively positioned at two sides of the base 6, so that the base 6 is fixedly limited on a lower datum plane of the press by a first bolt through the mounting slotted holes 61. The mounting slot 61 comprises a first opening groove 611 for the screw part of the first bolt to pass through and a second opening groove 612 for accommodating the screw part of the first bolt, the first opening groove 611 and the second opening groove 622 are both in a U shape, the mounting is simple and easy, dust can be conveniently cleaned, and the position precision is high after the mounting.

The internal diameter of support ring 4 (the internal diameter of annular ring 41) is greater than the external diameter of lower pressure disk 3, seted up on the lower terminal surface of support ring 4 with force sensor 5 appearance structure assorted holding tank 42, the tank bottom of holding tank 42 receives annular ring 41 on the support ring 4 runs through, and holding tank 42 communicates with each other with annular ring 41.

The force sensor 5 is fixedly mounted on the base 6 through a second bolt, and the force sensor 5 is connected with a display instrument so as to display a force value through the display instrument; the force sensor 5 is a strain gauge sensor. The support ring 4 is fixedly mounted on the base 6 through a third bolt, and the force sensor 5 is correspondingly positioned in the accommodating groove 42 of the support ring 4. The force sensor 5 is provided with a vertical threaded connecting rod which is oppositely positioned in an annular hole 41 of the supporting ring 4; the bottom of lower pressure disk 3 is equipped with the screw hole with threaded connection pole assorted, lower pressure disk 3 with force sensor 5 passes through threaded connection, lower pressure disk 3 is located in the ring hole 41 of support ring 4, the upper surface (the upper pressure face) of lower pressure disk 3 is higher than the up end of support ring 4.

And the upper pressure plate 1 is provided with a connecting shaft which is used for being precisely matched with a pressing mechanism of the press. The annular cushion block 2 is fixedly connected to the lower surface (lower pressing surface) of the upper pressing plate 1 through a fourth bolt, the axis of the annular cushion block 2 coincides with the axis of the upper pressing plate 1, and the inner diameter (the inner diameter of the circular hole 21) of the annular cushion block 2 is equal to the inner diameter (the inner diameter of the annular hole 41) of the support ring 4. The annular cushion block 2 is used for controlling the height of the upper pressure plate 1 after being pressed down.

The working principle is as follows: can place the spring that awaits measuring on the lower pressure disk 3, go up pressure disk 1 and correspondingly push down the back, annular cushion 2 and support ring 4 are compacted, and the spring is compressed to appointed height between pressure disk 3 and the last pressure disk 1 down, and power transmits to force transducer 5 through pressure disk 3 down to convert the power value by the instrument and show.

The first application method of the compression spring elasticity detection structure comprises the following steps: the device can be arranged on a cast iron manual press made of cast iron, and one spring can be detected every 6 seconds when the device is used.

The specific installation and use steps are as follows: the upper pressure plate 1 is installed on a lower pressing mechanism of the cast iron manual press in a matching mode, then the base 6 is placed on a lower reference surface of the cast iron manual press, the lower pressure plate 3 on the base 6 is opposite to the upper pressure plate 1, then the base 6 is fixed on the lower reference surface of the cast iron manual press through the first bolt, and then the matching installation of the compression spring elasticity detection structure is completed. The spring to be detected is placed on the lower pressure plate 1, the display instrument of the force sensor 5 is reset, the upper pressure plate 1 is pressed down through the driving handle, the annular cushion block 2 and the support ring 4 are pressed tightly, the display instrument of the force sensor 5 displays the force value under the compression height, and therefore the detection of the spring to be detected can be completed. And when the next spring is detected, the detected spring is taken down, and the steps are repeated.

The second use method of the compression spring elasticity detection structure comprises the following steps: in a precision detection application scene with low aging requirement, the two annular cushion blocks 2 with different heights are switched to respectively measure the elastic force at the two heights, and the rigidity (elastic coefficient) of the spring can be calculated.

The third use method of the compression spring elasticity detection structure comprises the following steps: the automatic spring grading machine can also be arranged on an automatic high-speed reciprocating pressing system (such as a cam mechanism), is assisted by an automatic feeding plate, or a feeding and discharging mechanism, or a multi-station turntable, and can realize high-speed automatic grading of spring elasticity.

The utility model eliminates the compression length error introduced by the included angle between the direction of the height scale and the normal line of the pressure plate by using the annular cushion block 2 and directly applying the pressure of the compression spring from the direction coaxial with the axis of the pressure plate; a support ring 4 is used, corresponding to the pad 2, so that the pressure exerted by the operator acts entirely on the support structure, and only the reaction force of the spring when compressed acts on the force sensor. The use of a small cast iron manual press frame ensures the rigidity of the entire system. And a high-rigidity strain sensor is selected, so that the deformation range in a full range is only 2um, the compression length error caused by the deformation of the sensor is eliminated, and the detection precision is further improved.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a compression spring elasticity detects structure, includes just relative last pressure disk and lower pressure disk, its characterized in that still includes: the annular cushion block is used for controlling the pressing height of the upper pressure plate, the support ring is opposite to the annular cushion block in a matched mode, and the force sensor is connected with the display instrument and the base; the annular cushion block is fixedly connected to the lower surface of the upper pressure plate, the axis of the annular cushion block is parallel to the axis of the upper pressure plate, and the inner diameter of an upper round hole of the annular cushion block is larger than the outer diameter of the lower pressure plate; the inner diameter of an annular hole in the support ring is larger than the outer diameter of the lower pressure plate, a containing groove matched with the shape structure of the force sensor is formed in the lower end face of the support ring, and the containing groove is communicated with the annular hole; the force sensor and the support ring are both fixedly arranged on the base, and the force sensor is correspondingly positioned in the accommodating groove of the support ring; the lower pressure plate is positioned in the annular hole of the support ring, the lower pressure plate is fixedly connected with the force sensor, and the upper surface of the lower pressure plate is higher than the upper end surface of the support ring.

2. The structure for detecting elasticity of a compression spring according to claim 1, wherein: the force sensor is provided with a vertical threaded connecting rod which is oppositely positioned in an annular hole of the support ring; the bottom of lower pressure disk is equipped with the screw hole with threaded connection pole assorted, lower pressure disk with force sensor passes through threaded connection.

3. A compression spring force detection structure according to claim 1 or 2, wherein: the force sensor is a strain gauge sensor.

4. The structure for detecting elasticity of a compression spring according to claim 1, wherein: the base is provided with a plurality of mounting slotted holes for the first bolts to pass through.

5. The structure of claim 4, wherein: the number of the mounting slotted holes is two, and the two mounting slotted holes are respectively positioned on two sides of the base; the mounting groove hole comprises a first opening groove for the screw rod part on the first bolt to pass through and a second opening groove for accommodating the screw cap part on the first bolt, and the first opening groove and the second opening groove are both in U shapes.

6. The structure for detecting elasticity of a compression spring according to claim 1, wherein: the method is applied to a manual cast iron press; the upper pressure plate is fixedly arranged on a pressing mechanism of the cast iron manual press, and the base is fixedly arranged on a lower reference surface of the cast iron manual press.

7. The structure for detecting elasticity of a compression spring according to claim 1, wherein: the upper pressing plate is fixedly arranged on an automatic high-speed reciprocating pressing system and is provided with an automatic feeding plate, or a feeding and discharging mechanism, or a multi-station rotating plate.

8. A compression spring force detection structure according to claim 1, 6 or 7, wherein: and the upper pressure plate is provided with a connecting shaft which is fixedly matched with the lower pressure mechanism.