Automatic reciprocating cylinder

Abstract

The utility model relates to the technical field of air cylinders, in particular to an automatic reciprocating air cylinder which comprises an air cylinder body which comprises a cylinder body, a piston capable of reciprocating in the cylinder body, a front cover and a rear cover, the air path block is fixed to the air cylinder body, a first air path communicating with the front cover and a second air path communicating with the rear cover are arranged in the air path block, the first air path and the second air path communicate with the interior of the cylinder body, and the air path block is further provided with an air inlet; the air inlet switching valve is connected with the air path block and used for switching the air inlet direction of the air inlet between a first air path and a second air path; the travel switch assembly comprises a first travel switch arranged on the front cover and a second travel switch arranged on the rear cover; wherein the first travel switch and the second travel switch are communicated with gas paths at the two ends of the gas inlet switching valve respectively, and when the piston moves to be in contact with the first travel switch or the second travel switch, the gas inlet switching valve switches the gas inlet direction, so that reciprocating motion of the piston is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylinders, in particular to an automatic reciprocating cylinder. Background Art

[0002] An automatic reciprocating cylinder is an actuator that can achieve reciprocating motion through an external electronic control system. It usually relies on the pressure change of a pneumatic system to drive a piston to reciprocate in the cylinder.

[0003] In the related art, the reciprocating motion of the cylinder is mostly achieved through an electronic control system. The electronic control system mostly includes a solenoid valve, a position sensor, a controller, etc. When specifically working, the controller determines the initial position of the cylinder according to the setting and issues an instruction to the solenoid valve to allow compressed air to enter the front end of the cylinder. At this time, the piston moves backward, and the air in the rear chamber is discharged. When the piston rod reaches the specified position, the controller changes the direction, so that the compressed air enters the rear end, the piston moves forward, and the air in the front chamber is discharged. In this way, the controller repeats the above process to achieve the reciprocating motion of the cylinder.

[0004] However, the above reciprocating cylinder relies on external electronic control to achieve, with a complex structure and high cost. Summary of the Utility Model

[0005] In view of at least one of the above technical problems, the utility model provides an automatic reciprocating cylinder, which simplifies the structure of the reciprocating cylinder and reduces the cost by improving the structure.

[0006] According to the first aspect of the utility model, there is provided an automatic reciprocating cylinder, comprising:

[0007] A cylinder body, including a cylinder block, a piston that can reciprocate in the cylinder block, and a front cover and a rear cover respectively connected to both ends of the cylinder block;

[0008] An air path block, fixed on the cylinder body, and the air path block has a first air path communicating with the front cover and a second air path communicating with the rear cover. The first air path and the second air path communicate with the inside of the cylinder block, and the air path block also has an air inlet;

[0009] An air inlet switching valve, connected to the air path block, for switching the air inlet direction of the air inlet between the first air path and the second air path;

[0010] A travel switch assembly, including a first travel switch arranged on the front cover and a second travel switch arranged on the rear cover;

[0011] Wherein, the first travel switch and the second travel switch are respectively communicated with the two ends of the air inlet switching valve through air paths. When the piston moves to contact the first travel switch or the second travel switch, the air inlet switching valve switches the air inlet direction to realize the reciprocating movement of the piston.

[0012] In some embodiments of the present invention, both the first travel switch and the second travel switch are two-position three-way valves. The passage close to the piston side in the two-position three-way valve is the exhaust passage, the middle passage is the commutation passage, the commutation passage is communicated with one end of the air inlet switching valve, and the passage far from the piston side is the air inlet passage, and the air inlet passage is communicated with the air inlet.

[0013] In some embodiments of the present invention, a return spring is further provided on the sides of the first travel switch and the second travel switch away from the piston.

[0014] In some embodiments of the present invention, the valve stem of the two-position three-way valve protrudes from the inner walls of the front cover and the rear cover. When the front cover or the rear cover contacts the valve stem, the valve stem drives to communicate the air inlet with the air inlet switching valve.

[0015] In some embodiments of the present invention, a quick exhaust valve communicated with the first air path and the second air path is further provided on the air path block. The quick exhaust valve is configured such that when gas enters the cylinder body, the gas passes through the internal passage of the quick exhaust valve. When the gas is discharged from the cylinder body, the main passage of the quick exhaust valve is closed, and the gas is discharged from the exhaust passage of the quick exhaust valve.

[0016] In some embodiments of the present invention, the air path block is fixedly connected to the front cover and the rear cover. The first air path is communicated with the air path block through the front cover, and then enters the air path block through the quick exhaust valve; the second air path is communicated with the air path block after passing through the rear cover, and enters the air path block after passing through the quick exhaust valve.

[0017] In some embodiments of the present invention, the air inlet switching valve is fixed on one side of the air path block. The commutation passage enters the air path block through the front cover or the rear cover, and then enters the air inlet switching valve through the air path block.

[0018] In some embodiments of the present invention, the air inlet passage enters the air path block through the front cover or the rear cover, and then is communicated with the air inlet.

[0019] In some embodiments of the present invention, the air inlet switching valve is a two-position five-way valve. The two air inlet passages are respectively communicated with both ends of the air inlet switching valve. The air inlet is communicated with the middle passage of the air inlet switching valve. The first air path and the second air path are respectively arranged in the passages on both sides of the middle passage.

[0020] In some embodiments of the present utility model, the cylinder body further has an output shaft connected to the piston, and the output shaft is disposed on at least one side of the piston.

[0021] The beneficial effects of the present utility model are as follows: By providing travel switches on the front cover and the rear cover of the cylinder body, when the piston moves to contact the travel switch on the front cover or the rear cover, the air path changes the intake direction of the intake switching valve, thereby realizing the change of the moving direction of the piston. Through the above settings, only a single air inlet needs to be ventilated to realize the reciprocating movement of the piston in the cylinder body. Compared with the prior art, no solenoid valve or the like is required for control, so that the structure of the cylinder body is simplified and the manufacturing cost is also reduced. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the automatic reciprocating cylinder in the embodiment of the present utility model;

[0024] Figure 2 It is a side view of the automatic reciprocating cylinder in the embodiment of the present utility model;

[0025] Figure 3 In the embodiment of the present utility model Figure 2 Cross-sectional view taken along line A-A;

[0026] Figure 4 In the embodiment of the present utility model Figure 2 Cross-sectional view taken along line B-B;

[0027] Figure 5 In the embodiment of the present utility model Figure 2 Cross-sectional view taken along line C-C;

[0028] Figure 6 In the embodiment of the present utility model Figure 4 Partial enlarged view at D;

[0029] Figure 7 In the embodiment of the present utility model Figure 2 Cross-sectional view taken along line E-E;

[0030] Figure 8 It is a schematic diagram of the air path when the piston in the embodiment of the present utility model moves to the front cover;

[0031] Figure 9 This is the pneumatic circuit schematic diagram when the piston moves from the front cover to the rear cover in the embodiment of the present utility model;

[0032] Figure 10 This is the pneumatic circuit schematic diagram when the piston moves to the rear cover in the embodiment of the present utility model;

[0033] Figure 11 This is the pneumatic circuit schematic diagram when the piston moves from the rear cover to the front cover in the embodiment of the present utility model. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the description of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] As Figures 1 to 7 shown, the automatic reciprocating cylinder includes a cylinder body 1, a pneumatic circuit block 2 and an intake switching valve 3, specifically as Figure 3 shown, the cylinder body 1 includes a cylinder block 11, a piston 12 that can reciprocate in the cylinder block 11, and a front cover 13 and a rear cover 14 respectively connected to both ends of the cylinder block 11; specifically as Figure 3 shown, the movement of the piston 12 in the cylinder block 11 is realized through the pneumatic circuits on the front cover 13 and the rear cover 14. When the pneumatic circuit in the front cover 13 intakes air and the pneumatic circuit in the rear cover 14 exhausts air, the piston 12 moves towards the rear cover 14, and vice versa, the piston 12 moves towards the front cover 13.

[0038] As Figure 1 and Figure 3As shown in the figure, the air passage block 2 is fixed to the cylinder body 1, and the air passage block 2 has a first air passage 21 communicating with the front cover 13 and a second air passage 22 communicating with the rear cover 14. The first air passage 21 and the second air passage 22 communicate with the inside of the cylinder block 11, and the air passage block 2 also has an air inlet 23; that is, when the first air passage 21 ventilates towards the inside of the cylinder block 11, the piston 12 is compressed and moves in the direction towards the rear cover 14, and when the second air passage 22 ventilates towards the cylinder block 11, the piston 12 moves in the direction towards the front cover 13; the intake switching valve 3 is connected to the air passage block 2 and is used to switch the intake direction of the air inlet 23 between the first air passage 21 and the second air passage 22; that is, when the air inlet 23 intakes air towards the first air passage 21 through the intake switching valve 3, by switching the intake switching valve 3, the air inlet 23 changes from intaking air towards the first air passage 21 to intaking air towards the second air passage 22; in the embodiment of the present invention, the switching of the intake switching valve 3 is completed by the travel switch assembly 4, as Figure 4 As shown in the figure, the travel switch assembly 4 includes a first travel switch 41 arranged on the front cover 13 and a second travel switch 42 arranged on the rear cover 14; wherein, the first travel switch 41 and the second travel switch 42 are respectively communicated with the two ends of the air path of the intake switching valve 3. When the piston 12 moves to contact the first travel switch 41 or the second travel switch 42, the intake switching valve 3 switches the intake direction to realize the reciprocating movement of the piston 12.

[0039] In the above embodiment, by arranging travel switches on the front cover 13 and the rear cover 14 of the cylinder body 1, when the piston 12 moves to contact the travel switch on the front cover 13 or the rear cover 14, the air path changes the intake direction of the intake switching valve 3, thereby realizing the change of the moving direction of the piston 12. Through the above arrangement, only a single air inlet 23 needs to ventilate to realize the reciprocating movement of the piston 12 in the cylinder body 1. Compared with the prior art, no solenoid valve or the like is required for control, so that the structure of the cylinder body 1 is simplified and the manufacturing cost is also reduced.

[0040] On the basis of the above embodiment, as Figure 6 As shown in the figure, both the first travel switch 41 and the second travel switch 42 are two-way three-way valves. The passage close to the piston 12 side in the two-way three-way valve is the exhaust passage 41a, the middle passage is the commutation passage 41b, the commutation passage 41b is communicated with one end of the intake switching valve 3, and the passage far from the piston 12 side is the intake passage 41c, and the intake passage 41c is communicated with the air inlet 23. In the embodiment of the present invention, as Figure 6As shown, when the first travel switch 41 and the second travel switch 42 are not triggered, the exhaust passage 41a is in communication with the commutation passage 41b to achieve exhaust when the valve stem inside the intake switching valve 3 moves. When the first travel switch 41 or the second travel switch 42 is triggered, the intake passage 41c is in communication with the commutation passage 41b, and the gas entering the commutation passage 41b from the intake passage 41c pushes the valve stem of the intake switching valve 3 to achieve the switching of the intake direction.

[0041] In an embodiment of the present utility model, when the piston 12 is not in contact with the travel switch, the forming switch is not in communication with the intake port 23, as Figure 6 shown, a return spring 43 is further provided on the side of the first travel switch 41 and the second travel switch 42 away from the piston 12. The return spring 43 remains compressed to achieve the pushing of the valve stem inside the travel switch. When the valve stem is pushed by the piston 12, the spring is further compressed, so that the intake passage 41c and the commutation passage 41b are briefly in communication. That is, as Figure 6 shown, the valve stem of the two-way three-way valve protrudes from the inner walls of the front cover 13 and the rear cover 14. When the front cover 13 or the rear cover 14 comes into contact with the valve stem, the valve stem is driven to connect the intake port 23 with the intake switching valve 3.

[0042] In an embodiment of the present application, in order to achieve the discharge of the gas on the side of the moving direction of the piston 12 when the piston 12 moves, as Figure 5 shown, a quick exhaust valve 24 communicating with the first air passage 21 and the second air passage 22 is further provided on the air path block 2. The quick exhaust valve 24 is configured such that when gas enters the cylinder block 11, the gas passes through the internal passage of the quick exhaust valve 24. When the gas is discharged from the cylinder block 11, the main passage of the quick exhaust valve 24 is closed, and the gas is discharged from the exhaust passage of the quick exhaust valve 24. The quick exhaust valve 24 is a prior art in the art, and the specific structural principle thereof will not be introduced in detail here. Through the setting of this one-way exhaust function, the movement response of the piston 12 is made more rapid.

[0043] In an embodiment of the present application, as Figure 3 shown, the air path block 2 is fixedly connected to the front cover 13 and the rear cover 14. The first air passage 21 is communicated with the air path block 2 via the front cover 13 and then enters the air path block 2 through the quick exhaust valve 24; the second air passage 22 is communicated with the air path block 2 via the rear cover 14 and enters the air path block 2 after passing through the quick exhaust valve 24. By providing air paths on the front cover 13 and the rear cover 14 and realizing the connection mode of the air paths through the fixation of the air path block 2, the setting of external pipelines is reduced. When fixing the air path block 2, only a sealing ring needs to be provided on the docking surface to ensure airtightness. Through the setting of this structural form, not only the setting of pipelines is reduced, but also the installation is facilitated.

[0044] Please continue to refer to Figure 5 and Figure 7, in the embodiment of the present utility model, the intake switching valve 3 is fixed on one side of the air passage block 2, and the commutation passage 41b enters the air passage block 2 through the front cover 13 or the rear cover 14, and then enters the intake switching valve 3 through the air passage block 2. By arranging the passage of the travel switch on the front cover 13 and the rear cover 14 as well and through the connection between the air passage block 2 and the front cover 13 or the rear cover 14, the connection of the air passage is realized; similarly, through the connection between the intake switching valve 3 and the air passage block 2, the passage of the commutation passage 41b from the air inlet 23 to the intake switching valve 3 is realized. During installation, it is only necessary to fix the intake switching valve 3 and the air passage block 2. In the embodiment of the present application, the intake passage 41c enters the air passage block 2 through the front cover 13 or the rear cover 14 and then communicates with the air inlet 23. During specific processing, the air passage can be opened on the air passage block 2. Through the above settings, not only the structure is simplified, but also the weight is reduced, the use of pipelines is reduced, and the installation is convenient, thereby saving costs.

[0045] In some embodiments of the present utility model, such as Figure 7 shown, the intake switching valve 3 is a two-position five-way valve. The two intake passages 41c are respectively communicated to both ends of the intake switching valve 3. The air inlet 23 is communicated with the middle passage of the intake switching valve 3. The first air passage 21 and the second air passage 22 are respectively arranged in the passages on both sides of the middle passage. By setting like this, as Figure 7 shown, when the lower commutation passage 41b intakes air, the valve stem in the two-position five-way valve moves upward. When the upper commutation passage 41b intakes air, the valve stem in the two-position five-way valve moves downward; when the valve stem moves upward, the gas entering from the air inlet 23 enters the first air passage 21; when the valve stem moves downward, the gas entering from the air inlet 23 enters the second air passage 22. In addition, it should be pointed out here that in the embodiment of the present application, the cylinder body 1 also has an output shaft 15 connected to the piston 12, and the output shaft 15 is arranged on at least one side of the piston 12. That is, in the embodiment of the present application, one output shaft 15 can be arranged, or output shafts 15 can be arranged on both sides to realize reciprocating movement; the fields where it can be applied can be forging presses or pumps, etc. In addition, it should be pointed out here that the air inlet 23 in the embodiment of the present application is communicated with the compressed air source. The greater the pressure of the compressed air source, the faster the reciprocating speed of the cylinder.

[0046] Please refer to the following Figures 8 to 11 , which is the working principle diagram of the automatic reciprocating cylinder in the embodiment of the present application. As Figure 8 shown, when the piston 12 moves to the rightmost side of the cylinder block 11 and contacts the first travel switch 41, the intake passage is opened, and the intake switching valve 3 is pushed, so that the first air passage 21 is opened, and the gas enters the front end of the cylinder block 11, as Figure 9As shown in the figure, the piston 12 moves towards the right under the action of air pressure, and the gas on the left side of the cylinder block 11 is discharged through the quick exhaust valve 24 on the second air passage 22; when the piston 12 moves to the leftmost side, as Figure 10 shown in the figure, the second travel switch 42 is triggered. At this time, the intake passage pushes the intake switching valve 3 in the opposite direction, so that the compressed air at the intake port 23 enters the second air passage 22. Please refer to Figure 11 . At this time, the piston 12 is pushed to move towards the right, and the air in the cylinder block 11 is discharged through the quick exhaust valve 24 on the first air passage 21. In this way, the reciprocating movement of the cylinder body 1 is realized by repeating this cycle.

[0047] Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic reciprocating cylinder, characterized in that: include: The cylinder body comprises a cylinder body, a piston reciprocating in the cylinder body, and a front cover and a rear cover respectively connected to both ends of the cylinder body; An air circuit block is fixed on the cylinder body, and the air circuit block has a first air circuit connected to the front cover and a second air circuit connected to the rear cover, the first air circuit and the second air circuit are connected to the cylinder body, and the air circuit block also has an air inlet; An air intake switching valve, connected to the air path block, for switching the air intake direction of the air intake port between the first air path and the second air path; A travel switch assembly, comprising a first travel switch arranged on the front cover and a second travel switch arranged on the rear cover; Among them, the first stroke switch and the second stroke switch are respectively connected to the air paths at both ends of the intake switching valve. When the piston moves to contact the first stroke switch or the second stroke switch, the intake switching valve switches the direction of intake to realize the reciprocating movement of the piston.

2. The automatic reciprocating cylinder according to claim 1, characterized in that: The first travel switch and the second travel switch are both two-position three-way valves, in which the passage close to the piston side is an exhaust passage, the middle passage is a reversing passage, the reversing passage is connected to one end of the intake switching valve, and the passage away from the piston side is an intake passage, which is connected to the intake port.

3. The automatic reciprocating cylinder according to claim 2, characterized in that: The first travel switch and the second travel switch also have a return spring on a side away from the piston.

4. The automatic reciprocating cylinder according to claim 3, characterized in that: The valve stem of the two-position three-way valve protrudes from the inner walls of the front cover and the rear cover. When the front cover or the rear cover contacts the valve stem, the valve stem is driven to connect the air inlet with the air inlet switching valve.

5. The automatic reciprocating cylinder according to claim 4, characterized in that: The gas circuit block also has a quick exhaust valve connected to the first gas circuit and the second gas circuit. The quick exhaust valve is configured so that when the gas enters the cylinder, the gas passes through the internal channel of the quick exhaust valve. When the gas is discharged from the cylinder, the main channel of the quick exhaust valve is closed and the gas is discharged from the exhaust channel of the quick exhaust valve.

6. The automatic reciprocating cylinder according to claim 5, characterized in that: The gas circuit block is fixedly connected to the front cover and the rear cover, the first gas circuit is connected to the gas circuit block via the front cover, and then enters the gas circuit block through the quick exhaust valve; the second gas circuit is connected to the gas circuit block via the rear cover, and enters the gas circuit block after passing through the quick exhaust valve.

7. The automatic reciprocating cylinder according to claim 6, characterized in that: The air intake switching valve is fixed on one side of the gas circuit block, and the reversing passage enters the gas circuit block through the front cover or the rear cover, and then enters the air intake switching valve through the gas circuit block.

8. The automatic reciprocating cylinder according to claim 7, characterized in that: The air intake passage enters into the air path block through the front cover or the rear cover, and then communicates with the air intake port.

9. The automatic reciprocating cylinder according to claim 8, characterized in that: The intake switching valve is a two-position five-way valve, the two intake passages are respectively connected to the two ends of the intake switching valve, the intake port is connected to the middle passage of the intake switching valve, and the first air passage and the second air passage are respectively arranged in the passages on both sides of the middle passage.

10. The automatic reciprocating cylinder according to claim 1, characterized in that: The cylinder body also has an output shaft connected to the piston, and the output shaft is arranged on at least one side of the piston.

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