Single-acting air cylinder

Abstract

The utility model relates to the technical field of single-acting cylinders, in particular to a single-acting cylinder. Comprising a cylinder barrel, a cylinder cover and a cylinder bottom, the cylinder barrel is welded to the cylinder cover, the cylinder bottom is detachably connected to the side, opposite to the cylinder cover, of the cylinder barrel, the outer side of the cylinder bottom is connected with the cylinder barrel through a nut, and a hole check ring is clamped to the outer end of the nut; an air inlet is welded to the side, close to the cylinder cover, of the cylinder barrel, a piston is slidably arranged in the cylinder barrel in a sealed mode, one end of a piston rod is sleeved with the piston and drives the piston rod to slide synchronously, and the other end of the piston rod penetrates through the cylinder cover and slides relative to the cylinder cover in a sealed mode. The piston divides the cylinder barrel into a left air cavity and a right air cavity, the left air cavity is communicated with the air inlet, and the right air cavity is communicated with the atmosphere; a spring is arranged in the right air cavity and connected with the piston and the cylinder bottom. A four-pull-rod structure is abandoned for single action, the sealing and pressure maintaining functions of the air cylinder are guaranteed through welding of the cylinder cover and the cylinder barrel, the reliable detachable connection mode of the cylinder bottom and the cylinder barrel is convenient to maintain, and weather resistance is high.

Description

Technical Field

[0001] This utility model relates to the field of single-acting cylinder technology, specifically a single-acting cylinder. Background Technology

[0002] Large trucks with two cargo compartments need to connect or separate the two compartments. To facilitate driver control of this connection or disconnection, current technology uses a single-acting cylinder in conjunction with a control system, allowing operation from the cab. The single-acting cylinder can be understood as a pin in this process. Currently used single-acting cylinders are mostly four-link structures. In this structure, the cylinder head and bottom are fixed with nuts, and all four links and their nuts are exposed to the air. Using a four-link structure as the support and limiting structure for the entire cylinder has the following disadvantages: frequent cylinder extension and retraction can cause the four links to loosen; the outer nut requires high weather resistance, especially in harsh climates, which can easily lead to loosening and affect the cylinder's service life. Therefore, a new cylinder structure is needed to replace the four-link structure and extend its service life. Utility Model Content

[0003] The problem to be solved is to propose a new type of cylinder structure to replace the four-link cylinder structure.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A single-acting cylinder includes a cylinder barrel, a cylinder head, and a cylinder bottom. The cylinder barrel and cylinder head are welded together. The cylinder bottom is detachably connected to the cylinder barrel on the side opposite to the cylinder head. The outer side of the cylinder bottom is connected to the cylinder barrel by a nut, and a retaining ring for a hole is fitted at the outer end of the nut. An air inlet is welded to the cylinder barrel near the cylinder head. A piston is slidably and sealed inside the cylinder barrel. One end of a piston rod is sleeved inside the piston and drives the piston rod to slide synchronously. The other end of the piston rod passes through the cylinder head and slides in a sealed manner relative to the cylinder head. The piston divides the cylinder barrel into a left air chamber and a right air chamber. The left air chamber is connected to the air inlet, and the right air chamber is connected to the atmosphere. A spring is provided in the right air chamber, and the spring connects the piston and the cylinder bottom.

[0005] Preferably, a signal feedback rod is connected to one end of the piston rod located in the right air chamber, and the other end of the signal feedback rod is slidably connected to the bottom of the cylinder.

[0006] Preferably, one end of the piston rod is sleeved in the limiting nut, a piston rod step is provided at the connection between the piston rod and the piston, a piston limit is provided on the piston, the piston limit is locked between the piston rod step and the limiting nut, and the limiting nut, piston rod and signal feedback rod are fixed by elastic cylindrical pins.

[0007] Preferably, an exhaust port is provided at the bottom of the cylinder, with one end of the exhaust port connected to the right air chamber and the other end connected to the atmosphere and fitted with a muffler.

[0008] Preferably, a limiting step is provided at the connection between the cylinder barrel and the cylinder head, and a limiting boss is provided on the cylinder head corresponding to the limiting step, with the limiting step and the limiting boss abutting against each other.

[0009] Preferably, the outer end of the cylinder head is integrally connected with bolts.

[0010] Preferably, a dustproof combination ring, a Y-shaped sealing ring 1, and a copper sleeve are sequentially arranged between the piston rod and the cylinder head, with the groove of the Y-shaped sealing ring 1 facing the left air chamber.

[0011] Preferably, a guide band and a second Y-shaped sealing ring are provided between the piston sidewall and the cylinder inner wall. The second Y-shaped sealing ring is located on the side near the right air chamber and its groove faces the left air chamber.

[0012] Preferably, the piston has a piston groove on one side of the spring, and the piston groove extends into a piston V-shaped groove; one end of the spring is connected to the piston groove, and the other end is connected to the cylinder bottom; the cylinder bottom has a spring groove corresponding to the spring, and the spring groove extends toward the cylinder head side to form a cylinder bottom V-surface.

[0013] Compared with the prior art, this utility model provides a single-acting cylinder with the following advantages: The single-acting design of this utility model eliminates the four-link structure; the cylinder head and cylinder barrel are connected by limiting bosses and limiting steps combined with fish-scale welding, ensuring the cylinder's sealing and pressure-holding function; the double-layer sealing ring ensures the dynamic sealing performance between the front cover and the piston rod; the reliable detachable connection between the cylinder bottom and cylinder barrel facilitates maintenance and provides strong weather resistance; the V-groove on the cylinder piston and the V-surface on the cylinder bottom increase the spring's accommodating space, preventing damage during spring contraction; and the signal feedback rod allows for better integration with the control system, enabling remote control. Attached Figure Description

[0014] Figure 1 This is the right view of the present invention;

[0015] Figure 2 This is a cross-sectional view of the present invention;

[0016] Explanation of reference numerals in the attached diagram: 1. Cylinder barrel; 11. Inlet port; 12. Left air chamber; 13. Right air chamber; 14. Limiting step; 2. Cylinder head; 21. Bolt; 22. Limiting boss; 3. Cylinder bottom; 31. Spring groove; 32. Cylinder bottom V-face; 33. Annular step one; 34. Annular step two; 35. Exhaust port; 36. Muffler; 37. Cylinder bottom dust seal; 4. Piston rod; 41. Piston rod step; 42. Limiting nut; 43. Dustproof combination ring; 44. Y-type seal ring one; 45. Copper sleeve; 5. Piston; 51. Piston groove; 52. Piston V-groove; 53. Piston limit; 54. Guide band; 55. Y-type seal ring two; 6. Signal feedback rod; 61. Dust seal; 7. Spring; 8. Nut; 9. Hole retaining ring; 10. Elastic cylindrical pin. Detailed Implementation

[0017] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model:

[0018] As shown in the figure, this utility model proposes a single-acting cylinder. The cylinder of this solution does not use the traditional four-link structure to support and limit the cylinder. Specifically, it includes a cylinder barrel 1, a cylinder head 2, and a cylinder bottom 3. A limiting step 14 is provided at the connection between the cylinder barrel 1 and the cylinder head 2. The cylinder head 2 is provided with a limiting boss 22 corresponding to the limiting step 14. After the limiting step 14 and the limiting boss 22 abut against each other, the cylinder barrel 1 and the cylinder head 2 are welded together. The welding method adopts fish scale welding to ensure the pressure holding and sealing function of the cylinder. The cylinder bottom 3 is connected to the cylinder barrel 1 on the opposite side of the cylinder head 2. The cylinder bottom 3 and the cylinder barrel 1 are detachably connected, which facilitates installation and replacement of parts. Specifically, the part of the cylinder bottom 3 that directly contacts the inside of the cylinder barrel 1 is statically connected by a cylinder bottom dustproof ring 37. The outside of the cylinder bottom 3 is connected to the cylinder barrel 1 by a nut 8. There are two annular steps 33 and 34 on the outside of the cylinder bottom 3. The nut 8 is inserted into the annular step 33 and threadedly connected to the cylinder barrel 1. The annular step 34 is inserted into a retaining ring 9 to prevent the nut 8 from loosening and falling off. The inner circle of the retaining ring 9 abuts against the cylinder bottom 3, and the outer circle of the retaining ring 9 is inserted into the annular groove of the cylinder barrel 1. This solution firmly presses the cylinder bottom 3 to the bottom inside of the cylinder barrel 1 by the nut 8 and the retaining ring 9, and the cylinder head 2 is welded to the cylinder barrel as a whole. This method replaces the traditional four-link connection between the cylinder head and the cylinder bottom, which is more adaptable to harsh environments and ensures the reliability of the cylinder. A piston 5 is installed inside the cylinder 1. The piston 5 slides along the inner wall of the cylinder 1, sealing and dividing the cylinder 1 into a left air chamber 12 and a right air chamber 13. A double-layer sealing ring is provided between the piston rod 4 and the cylinder head 2, namely a dustproof combination ring 43 and a Y-type sealing ring 44. The groove of the Y-type sealing ring 44 faces the left air chamber 12. In this way, if there is a slight leakage when high-pressure gas enters the left air chamber 12, the Y-type sealing ring 44 will expand, thus improving the sealing effect. The dustproof combination ring 43 includes a dustproof ring and a Y-type sealing ring. The Y-type sealing ring here has the same function as the Y-type sealing ring 44, ensuring the piston rod is in a good working order. A dynamic seal is provided between the piston rod 4 and the cylinder head 2; a copper sleeve 45 is provided on the side of the Y-type sealing ring 44 near the left air chamber 12. The copper sleeve 45 can reduce the friction on the piston rod 4 and extend the cylinder life; an air inlet 11 is welded on the side of the cylinder barrel 1 near the cylinder head 2. The left air chamber 12 is connected to the air inlet 11, and the right air chamber 13 is connected to the atmosphere. The right air chamber 13 is the area between the piston 5 and the cylinder bottom 3. An exhaust hole 35 is opened at the bottom of the cylinder bottom 3. One end of the exhaust hole 35 is connected to the right air chamber 13, and the other end is connected to the atmosphere and fitted with a muffler 36. The muffler 36 is a stainless steel muffler to improve the weather resistance of the equipment.One end of the piston rod 4 is fitted inside the piston 5, causing the piston rod 4 to slide together. The other end of the piston rod 4 passes through the cylinder head 2 and slides in a sealed manner relative to the cylinder head 2. A piston rod step 41 is provided at the connection between the piston rod 4 and the piston 5. A piston limit 53 is provided on the piston 5. One end of the piston limit 53 abuts against the piston rod step 41, and the other end abuts against the limit nut 42. A static seal is achieved between the piston limit 53 and the piston rod 4 through a sealing ring. The limit nut 42 is fitted on the end of the piston rod 4 located in the right air chamber 13. The piston limit 53 is locked between the piston rod step 41 and the limit nut 42, allowing the piston 5 to drive the piston rod 4 to slide together. A guide band 54 and a Y-shaped sealing ring 55 are provided in sequence between the outer side of the piston 5 and the inner wall of the cylinder 1. The groove of the Y-shaped sealing ring 55 faces the left air chamber 12. The guide band 54 is made of PTFE copper and serves to guide and reduce friction. A spring 7 is installed in the right air chamber 13. A piston groove 51 is provided on one side of the spring 7. One end of the spring 7 is connected to the piston groove 51. A piston V-groove 52 extends from the piston groove 51 towards the cylinder bottom 3. The connection point between the piston V-groove 52 and the piston groove 51 is the narrowest point of the piston V-groove 52. The other end of the spring 7 is connected to the cylinder bottom 3. A spring groove 31 is provided on the cylinder bottom 3 corresponding to the spring 7. A cylinder bottom V-surface 32 extends from the spring groove 31 towards the cylinder head 2. The connection point between the cylinder bottom V-surface 32 and the spring groove 31 is the bottom of the cylinder bottom V-surface 32. The piston V-groove 52 and the cylinder bottom V-surface 32... The design increases the space for the spring 7 during the contraction process. Without the piston V-groove 52 and cylinder bottom V-surface 32, the spring 7 would easily touch the edges of the piston groove 51 and spring groove 31 during extension and retraction. Since the cylinder head 2 and cylinder bottom 3 are made of hard materials, the spring 7 would be easily damaged when it touches the edges of the piston groove 51 and spring groove 31, requiring replacement. The design of the piston V-groove 52 and cylinder bottom V-surface 32 not only effectively solves the problem of spring 7 damage, but also reduces the weight of the cylinder while ensuring its function, achieving cylinder lightweighting and saving raw materials.

[0019] To better integrate with the control system, a signal feedback rod 6 is connected to one end of the piston rod 4 located in the right air chamber 13. The other end of the signal feedback rod 6 is slidably connected to the cylinder bottom 3. An elastic cylindrical pin 10 fixes the limit nut 42, piston rod 4, and signal feedback rod 6 together, allowing them to move synchronously. A dustproof ring 61 is installed at the connection between the signal feedback rod 6 and the cylinder bottom 3 to prevent dust from entering the cylinder. After the signal feedback rod 6 moves into position, it is recognized by the position sensor, which sends the position signal of the signal feedback rod 6 to the control system. The air inlet 11 is connected to the control system via an electromagnetic control valve. The electromagnetic control valve is existing technology. One position of the electromagnetic control valve connects the high-pressure air source to the air inlet 11, while the other position cuts off the high-pressure air source, allowing the air inlet 11 to be connected to the atmosphere. A bolt 21 is integrally connected to the outer end of the cylinder head 2, which facilitates the fixing of the cylinder.

[0020] In use, taking the connection of two carriages as an example, when the two carriages need to be separated, the piston rod 4 retracts into the cylinder 1. The electromagnetic control valve of the air inlet 11 allows high-pressure gas to flow into the left air chamber 12. The high-pressure gas filling the left air chamber 12 pushes the piston 5 towards the cylinder bottom 3 and compresses the spring 7. During the compression process, the piston V-groove 52 and the cylinder bottom V-surface 32 provide sufficient space to prevent damage to the spring 7. The air in the right air chamber 13 is discharged through the exhaust port 35. The signal feedback rod 6 moves synchronously with the piston rod 4. After the signal feedback rod 6 moves into position, it is recognized by the control system, and the two carriages are separated. When the two carriages are reconnected, the electromagnetic control valve opens the left air chamber 12 to the atmosphere. There is no high-pressure gas in the left air chamber 12. The elastic force of the spring 7 pushes the piston 5 to slide towards the cylinder head 2, while the piston rod 4 extends to connect the two carriages.

[0021] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A single-acting cylinder, comprising a cylinder barrel (1), a cylinder head (2), and a cylinder bottom (3), characterized in that: The cylinder barrel (1) is welded to the cylinder head (2). The cylinder bottom (3) is detachably connected to the cylinder barrel (1) on the side opposite to the cylinder head (2). The outer side of the cylinder bottom (3) is connected to the cylinder barrel (1) by a nut (8). The outer end of the nut (8) is fitted with a retaining ring (9) for holes. An air inlet (11) is welded to the side of the cylinder barrel (1) near the cylinder head (2). A piston (5) is sealed and slidably installed inside the cylinder barrel (1). One end of the piston rod (4) is sleeved inside the piston (5) and drives the piston rod (4) to slide synchronously. The other end of the piston rod (4) passes through the cylinder head (2) and slides in a sealed manner relative to the cylinder head (2). The piston (5) divides the cylinder barrel (1) into a left air chamber (12) and a right air chamber (13). The left air chamber (12) is connected to the air inlet (11), and the right air chamber (13) is connected to the atmosphere. A spring (7) is installed inside the right air chamber (13). The spring (7) connects the piston (5) and the cylinder bottom (3).

2. The single-acting cylinder as described in claim 1, characterized in that: The piston rod (4) is connected to a signal feedback rod (6) at one end of the right air chamber (13), and the other end of the signal feedback rod (6) is slidably connected to the cylinder bottom (3).

3. The single-acting cylinder as described in claim 2, characterized in that: One end of the piston rod (4) is fitted into the limiting nut (42). A piston rod step (41) is provided at the connection between the piston rod (4) and the piston (5). A piston limit (53) is provided on the piston (5). The piston limit (53) is locked between the piston rod step (41) and the limiting nut (42). The limiting nut (42), the piston rod (4) and the signal feedback rod (6) are fixed by an elastic cylindrical pin (10).

4. The single-acting cylinder as described in claim 3, characterized in that: The bottom of the cylinder (3) is provided with an exhaust port (35). One end of the exhaust port (35) is connected to the right air chamber (13), and the other end is connected to the atmosphere and fitted with a muffler (36).

5. The single-acting cylinder as described in claim 1, characterized in that: A limiting step (14) is provided at the connection between the cylinder barrel (1) and the cylinder head (2). The cylinder head (2) is provided with a limiting boss (22) corresponding to the limiting step (14). The limiting step (14) and the limiting boss (22) abut against each other.

6. The single-acting cylinder as described in claim 5, characterized in that: The cylinder head (2) is integrally connected to the outer end with bolts (21).

7. The single-acting cylinder as described in claim 6, characterized in that: A dustproof combination ring (43), a Y-type sealing ring (44) and a copper sleeve (45) are sequentially installed between the piston rod (4) and the cylinder head (2), with the groove of the Y-type sealing ring (44) facing the left air chamber (12).

8. The single-acting cylinder as described in claim 7, characterized in that: A guide band (54) and a Y-shaped sealing ring II (55) are provided between the side wall of the piston (5) and the inner wall of the cylinder (1). The Y-shaped sealing ring II (55) is located on the side close to the right air chamber (13) and its groove faces the left air chamber (12).

9. The single-acting cylinder as described in claim 1, characterized in that: The piston (5) has a piston groove (51) on one side of the spring (7), and the piston groove (51) extends into a piston V-groove (52); one end of the spring (7) is connected in the piston groove (51), and the other end is connected to the cylinder bottom (3); the cylinder bottom (3) has a spring groove (31) corresponding to the spring (7), and the spring groove (31) extends into a cylinder bottom V-surface (32) towards the cylinder head (2).

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