CN213478812U - Rodless speed-increasing cylinder - Google Patents

Abstract

The utility model discloses a rodless accelerating cylinder, which comprises a cylinder barrel, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are connected with the front end and the rear end of the cylinder barrel; the cylinder barrel comprises an inner cylinder barrel, a middle cylinder barrel and an outer cylinder barrel which are sequentially coaxially sleeved from inside to outside, an inner piston which axially reciprocates along the inner cylinder barrel is arranged in the inner cylinder barrel, a process cylinder chamber used for hydraulic driving is formed between the inner piston and a rear end cover, and a liquid flow channel is arranged in the rear end cover and communicated with the process cylinder chamber. The utility model discloses a piston orders about annular piston through atmospheric pressure and removes in the security, and the setting of first intercommunicating pore, second intercommunicating pore forms "S" shape gas circuit for interior piston can strengthen the compact structure degree of cylinder body with annular piston on same vertical direction, and the gas circuit can prolong simultaneously, improves drive moment, can effectively improve drive stroke and top speed, can improve the drive stroke under the limited circumstances of installation space.

Description

Rodless speed-increasing cylinder

Technical Field

The utility model relates to an acceleration rate jar especially relates to a rodless type acceleration rate jar.

Background

The traditional pneumatic cylinder or hydraulic cylinder respectively uses gas or oil as a medium to push the piston and the piston rod thereof to advance or retract, so that the pressure of the gas or oil can be converted into mechanical energy through the pneumatic cylinder or hydraulic cylinder, and a mechanism connected with the outer end part of the piston rod is driven; the pressurizing cylinder utilizes the effective area difference of the piston and the plunger to enable a local area in a hydraulic system to obtain high pressure output, and is generally applied to occasions such as printing, bending, punching, forging, punching, folding, pressing, extrusion forming, compression forming, riveting, cutting and the like; the speed-increasing cylinder device is composed of a piston cylinder and a plunger cylinder, a piston inner cavity of the piston cylinder is a cylinder barrel of the plunger cylinder, a plunger is fixed on the cylinder barrel of the piston cylinder, when hydraulic oil enters the plunger cylinder, the piston moves fast, when the hydraulic oil simultaneously enters the plunger cylinder and the piston cylinder, the piston moves slowly, the speed-increasing cylinder is used for a fast moving loop, and under the premise that the flow of a pump is not increased, an executing element can obtain higher working speed as far as possible.

In the prior art, a hydraulic speed-increasing cylinder is disclosed in patent 200820041505.2, and a speed-increasing cylinder device is disclosed in patent 201210421164.2, which all accelerate speed by pushing a built-in small plunger through a main cylinder piston, and the driving stroke is limited under the condition of limited installation space.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present invention is to provide a rodless speed-increasing cylinder that increases the driving stroke when the installation space is limited.

In order to achieve the purpose, the utility model provides a rodless accelerating cylinder, which comprises a cylinder barrel, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are connected with the front end and the rear end of the cylinder barrel; the cylinder barrel comprises an inner cylinder barrel, a middle cylinder barrel and an outer cylinder barrel which are coaxially sleeved from inside to outside in sequence, an inner piston which reciprocates along the axial direction of the inner cylinder barrel is arranged in the inner cylinder barrel, a process cylinder chamber used for hydraulic driving is formed between the inner piston and a rear end cover, and a liquid flow channel is arranged in the rear end cover and communicated with the process cylinder chamber; a first communicating hole is formed in the position, close to the front end cover, of the inner cylinder barrel, and a gap between the inner cylinder barrel and the middle cylinder barrel is communicated with an inner cavity of the inner cylinder barrel through the first communicating hole; a second communication hole is formed in the position, close to the rear end cover, of the middle cylinder barrel and communicated with the gap between the middle cylinder barrel and the outer cylinder barrel; the gap between the middle cylinder barrel and the outer cylinder barrel is provided with an annular piston driven by the inner piston through air pressure, and the cylinder barrel is connected with a load frame which moves synchronously with the annular piston and is used for mounting a load; a return cylinder chamber is formed between the annular piston and the front end cover, and an airflow channel communicated with the return cylinder chamber is arranged on the front end cover.

As a further improvement of the technical scheme of the utility model, the longitudinal section area of interior piston is greater than the longitudinal section area of annular piston.

As the utility model discloses technical scheme's further improvement, an end face that interior piston is close to the rear end cap is equipped with the axially recessed dashpot, liquid flow channel's front end is equipped with buffering plunger, buffering plunger and dashpot adaptation and including in the coaxial dashpot that stretches into of piston return stage.

As a further improvement of the technical scheme of the utility model, the upper part of the outer cylinder barrel is provided with a notch which is arranged along the axial direction, and the annular dustproof stainless steel belt and the annular sealing belt are respectively arranged at the inner side and the outer side of the notch; a guide block is arranged between the annular dustproof stainless steel band and the annular sealing band, and the guide block is of a shuttle-shaped structure with pointed front and back ends and wide middle; the guide block axially moves along the outer cylinder barrel from the notch, and is connected with the annular piston and reciprocates along the notch along with the reciprocating motion of the annular piston; the load frame is connected with the guide block and absorbs the displacement load transmitted to the guide block by the annular piston to reciprocate along the notch.

As the utility model discloses technical scheme's further improvement, the position that outer cylinder top surface is located the notch left and right sides all is equipped with the axial guide, the left and right sides difference fixedly connected with of load frame and diaxon guide rail one-to-one's deflector, the bottom card of deflector is gone into in the axial guide and is fixed a position the slip.

Compared with the prior art, the utility model discloses following beneficial technological effect has:

the utility model provides a pair of no pole type acceleration rate jar, interior piston order about annular piston through atmospheric pressure and remove, and the setting of first intercommunicating pore, second intercommunicating pore forms "S" shape gas circuit for interior piston can be in same vertical direction with annular piston, has strengthened the compact structure degree of cylinder body, and the gas circuit can prolong simultaneously, improves driving moment, can effectively improve drive stroke and top speed, can improve the drive stroke under the limited circumstances of installation space.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a cross-sectional view of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Examples

As shown in fig. 1 to 2: the embodiment provides a rodless speed-increasing cylinder, which comprises a cylinder barrel, a front end cover 201 and a rear end cover 202, wherein the front end cover 201 and the rear end cover 202 are connected to the front end and the rear end of the cylinder barrel; the cylinder barrel comprises an inner cylinder barrel 203, a middle cylinder barrel 204 and an outer cylinder barrel 205 which are coaxially sleeved from inside to outside in sequence, an inner piston 206 which reciprocates along the axial direction of the inner cylinder barrel 203 is arranged in the inner cylinder barrel, a process cylinder chamber 207 for hydraulic driving is formed between the inner piston 206 and a rear end cover 202, a liquid flow channel 208 is arranged in the rear end cover 202, and the liquid flow channel 208 is communicated with the process cylinder chamber 207. The front and rear are the left and right directions in fig. 1, respectively. The flow channel 208 is used to fill with pressurized fluid.

A first communication hole 209 is formed in the inner cylinder 203 at a position close to the front end cover 201, and a gap between the inner cylinder 203 and the middle cylinder 204 is communicated with an inner cavity of the inner cylinder 203 through the first communication hole 209; a second communication hole 210 is formed in the middle cylinder 204 and close to the rear end cover 202, and the second communication hole 210 is communicated with a gap between the middle cylinder 204 and the outer cylinder 205; an annular piston 211 driven by the inner piston 206 through air pressure is arranged in a gap between the middle cylinder barrel 204 and the outer cylinder barrel 205, and a load frame 212 which moves synchronously with the annular piston 211 and is used for mounting a load is connected to the cylinder barrel; a return cylinder chamber 213 is formed between the annular piston 211 and the front end cover 201, and an airflow passage 214 communicating with the return cylinder chamber 213 is provided in the front end cover 201.

The cylinder barrel can be connected with the front end cover 201 and the rear end cover 202 in a threaded manner; the inner cylinder 203 and the middle cylinder 204 are preferably cylinder structures, the front end face and the rear end face of each cylinder can be provided with corresponding cylinder covers, and the outer cylinder 205 is preferably a structure with the top cut into a sliding plane so as to facilitate the sliding of the load frame 212; a sealing ring is arranged between the inner piston 206 and the inner wall of the inner cylinder 203; the annular piston 211 and the load frame 212 can be linked through a magnetic coupling structure or a mechanical contact structure; the inner piston 206 drives the annular piston 211 to move through air pressure, and the first communication hole 209 and the second communication hole 210 form an S-shaped air path, so that the inner piston 206 and the annular piston 211 can be in the same vertical direction, the structural compactness of the speed cylinder 2 is enhanced, meanwhile, the air path is prolonged, and the driving moment is improved.

In this embodiment, the longitudinal cross-sectional area of the inner piston 206 is greater than the longitudinal cross-sectional area of the annular piston 211; for example, the longitudinal cross-sectional area of the inner piston 206 may be 2-4 times the longitudinal cross-sectional area of the annular piston 211, which may effectively increase the drive torque.

In this embodiment, an end face of the inner piston 206 near the rear end cap 202 is provided with an axially recessed buffer groove 216, and the front end of the liquid flow channel 208 is provided with a buffer plunger 215, and the buffer plunger 215 is adapted to the buffer groove 216 and coaxially extends into the buffer groove 216 during the return stroke of the inner piston 206.

In this embodiment, the upper portion of the outer cylinder 205 is provided with a notch 217 formed along the axial direction, and the annular dustproof stainless steel belt 218 and the annular sealing belt 219 are respectively disposed on the inner side and the outer side of the notch 217; a guide block 220 is arranged between the annular dustproof stainless steel belt 218 and the annular sealing belt 219, and the guide block 220 is of a shuttle-shaped structure with two pointed front and back ends and a wide middle part; the guide block 220 axially moves along the outer cylinder barrel 205 from the notch 217, and the guide block 220 is connected with the annular piston 211 and reciprocates along the notch 217 along with the reciprocating motion of the annular piston 211; the load frame 212 is coupled to the guide block 220 and absorbs the displacement load transmitted to the guide block 220 by the annular piston 211 to reciprocate along the slot 217. A sealing tape cover may also be mounted on the slot 217. The annular piston 211, the guide block 220 and the load frame 212 are integrated, when the inner piston 206 moves forwards, the annular piston 211 moves forwards, the movement of the annular piston 211 transmits the load to the load frame 212 through the guide block 220, and the load frame 212 also moves forwards; when the inner piston 206 moves backward, the annular piston 211 also moves backward, and the guide block 220 moves backward; the guide block 220 of the shuttle structure can effectively reduce frictional resistance. Further, the structure and principle of the annular piston 211, the guide block 220 and the load frame 212 can also be seen in patent CN 103352894A, CN 205089716U or CN 107842535 a.

In this embodiment, axial guide rails 221 are disposed at positions of the top surface of the outer cylinder 205 located at the left and right sides of the slot 217, guide plates 222 corresponding to the two axial guide rails 221 one by one are fixedly connected to the left and right sides of the load frame 212, respectively, and bottoms of the guide plates 222 are clamped in the axial guide rails 221 and positioned to slide; the stability and the loading capacity of the movement of the load frame 212 can be effectively improved.

The rodless speed increasing cylinder provided by the embodiment has the following action principle:

pressure liquid enters the cylinder body through a joint of the rear end cover 202, the inner piston 206 is pushed to move forwards, compressed gas enters the outer cylinder barrel 205 through a circular pipe wall formed by the inner cylinder barrel 203 and the middle cylinder barrel 204, the annular piston 211 is pushed to move forwards, and due to the fact that the cross section area of the inner piston 206 is larger than the ring area of the annular piston 211, the gas entering a cavity at the rear end of the link piston under the condition of equal pressure is increased, and the speed is increased again; the annular piston 211 drives the load frame 212 to move through the shuttle-shaped guide block 220, so as to drive a load (load not shown) mounted on the load frame 212 to move at a high speed, and realize the function of increasing the speed of the load; on the return stroke, the air flow path 214 inflates, pushing the inner piston 206 backward and the fluid flows back to the drive unit.

Finally, it is stated that the specific individual example is used herein to explain the principle and the implementation of the present invention, and the explanation of the above embodiment is only used to help understand the core idea of the present invention, without departing from the principle of the present invention, it is also possible to make the present invention undergo several improvements and modifications, and these improvements and modifications also fall into the protection scope of the present invention.

Claims (5)

1. A rodless speed-increasing cylinder comprises a cylinder barrel, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are connected with the front end and the rear end of the cylinder barrel; the method is characterized in that: the cylinder barrel comprises an inner cylinder barrel, a middle cylinder barrel and an outer cylinder barrel which are coaxially sleeved from inside to outside in sequence, an inner piston which reciprocates along the axial direction of the inner cylinder barrel is arranged in the inner cylinder barrel, a process cylinder chamber used for hydraulic driving is formed between the inner piston and a rear end cover, and a liquid flow channel is arranged in the rear end cover and communicated with the process cylinder chamber;

a first communicating hole is formed in the position, close to the front end cover, of the inner cylinder barrel, and a gap between the inner cylinder barrel and the middle cylinder barrel is communicated with an inner cavity of the inner cylinder barrel through the first communicating hole; a second communication hole is formed in the position, close to the rear end cover, of the middle cylinder barrel and communicated with the gap between the middle cylinder barrel and the outer cylinder barrel; the gap between the middle cylinder barrel and the outer cylinder barrel is provided with an annular piston driven by the inner piston through air pressure, and the cylinder barrel is connected with a load frame which moves synchronously with the annular piston and is used for mounting a load; a return cylinder chamber is formed between the annular piston and the front end cover, and an airflow channel communicated with the return cylinder chamber is arranged on the front end cover.

2. The rodless speed increasing cylinder according to claim 1, wherein: the longitudinal sectional area of the inner piston is larger than that of the annular piston.

3. The rodless speed increasing cylinder according to claim 1, wherein: one end face, close to the rear end cover, of the inner piston is provided with an axially-recessed buffer groove, the front end of the liquid flow channel is provided with a buffer plunger, and the buffer plunger is matched with the buffer groove and coaxially extends into the buffer groove in the return stroke stage of the inner piston.

4. A rodless speed increasing cylinder according to any one of claims 1 to 3, characterized in that: the upper part of the outer cylinder barrel is provided with a notch which is arranged along the axial direction, and the annular dustproof stainless steel band and the annular sealing band are respectively arranged on the inner side and the outer side of the notch; a guide block is arranged between the annular dustproof stainless steel band and the annular sealing band, and the guide block is of a shuttle-shaped structure with pointed front and back ends and wide middle; the guide block axially moves along the outer cylinder barrel from the notch, and is connected with the annular piston and reciprocates along the notch along with the reciprocating motion of the annular piston; the load frame is connected with the guide block and absorbs the displacement load transmitted to the guide block by the annular piston to reciprocate along the notch.

5. The rodless speed increasing cylinder according to claim 4, wherein: the position that outer cylinder top surface is located the notch left and right sides all is equipped with the axial guide rail, the left and right sides of load frame fixedly connected with respectively with the diaxon guide rail one-to-one deflector, the bottom card of deflector slides in going into the axial guide rail and fixing a position.

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