A piston-cylinder structure with stable guidance against axial rotation

Abstract

The utility model discloses a kind of stable guiding piston cylinder structure with anti-axial rotation, it is related to piston cylinder technical field.The stable guiding piston cylinder structure with anti-axial rotation, including piston body, the piston body upper is provided with reversing mechanism, the piston body is provided with cylinder body, the cylinder body inside is provided with piston, the piston is provided with piston sealing ring, the cylinder body right end is provided with front cover plate, the piston is connected with piston push rod, piston is fixed with piston fixed ring between push rod and piston and is fixed, the right end of piston push rod passes through the front cover plate between and is provided with push rod sliding sleeve, the right end of front cover plate is provided with guide rod fixed disc, the guide rod fixed disc is provided with four guide rods, the left end of guide rod is connected with piston, the rightmost end of piston push rod is provided with retaining disc, the right end of guide rod is connected with retaining disc with retaining disc.

Description

Technical Field

[0001] This utility model relates to the field of piston cylinder technology, specifically a piston cylinder structure with a stable guide that prevents axial rotation. Background Technology

[0002] Most existing telescopic cylinders (such as pneumatic cylinders or hydraulic cylinders) include a cylinder body, piston, piston rod, and sealing ring. The piston is located inside the cylinder body, the piston rod is fixed on the piston, and the sealing ring is used to seal between the piston and the cylinder body. The sealing ring is located on the inner wall of the cylinder body and is a standard variable diameter sealing ring. During operation, pressure causes the piston to move. By changing the direction of pressure in and out, the direction of piston movement is changed.

[0003] For example, patent number CN 202900828 U provides a cylinder structure including a cylinder body, a piston, and a piston rod. The cylinder body has internal grooves extending from the bottom to the top of the inner wall, distributed around the circumference of the inner wall in multiple locations. The cross-sectional shape of the piston's outer wall is the same as that of the cylinder's inner wall. The piston has a hollow structure, which is a disc-shaped structure with multiple supporting structures inside. This cylinder structure is simple. The convex and concave groove design between the piston and the cylinder's inner wall increases the contact area between them, facilitating gas circulation and buffering the piston's reciprocating motion. Simultaneously, this structure prevents the piston from rotating radially within the cylinder. The hollow structure inside the piston helps reduce the overall weight of the cylinder.

[0004] For example, patent number CN 221347185 U provides a sealing structure for a piston compression cylinder, relating to the field of compression cylinder technology. It includes a cylinder body, a piston head slidably connected within the cylinder body, a piston rod fixed to one side wall of the piston head, one end of the piston rod slidably penetrating one end of the cylinder body, a sealing ring fastened to the surface of the piston head, and the outer wall of the sealing ring slidably connected to the inner wall of the cylinder body. This invention, by setting a spherical groove, a sealing assembly, and ball bearings, with the sealing assembly filled with lubricating oil, allows the ball bearings, in close contact with the inner wall of the cylinder body, to roll as the piston head reciprocates during piston compression. The rolling ball bearings continuously absorb the lubricating oil from the sealing assembly and apply it to the inner wall of the cylinder body, ensuring good lubrication between the sealing ring on the piston head and the cylinder body. This reduces friction and wear on the sealing ring, improving the sealing effect of the compression cylinder.

[0005] The aforementioned patent states that the push rod can rotate during use, and the electric cylinder's anti-rotation mechanism fails, which directly leads to positioning deviation at the actuator end, loss of load posture control, and damage to the transmission part. The core issues lie in design flaws, poor adaptability to working conditions, and improper assembly and maintenance. The current anti-rotation mechanism is made of white nylon (PA), which has advantages such as high strength, high wear resistance, and self-lubrication compared to other polymer materials. However, its ability to withstand radial torque is relatively weak, and long-term exposure will result in deformation, wear, or even breakage, leading to anti-rotation failure. Utility Model Content

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a piston cylinder structure with a stable guide that prevents axial rotation. This solves the problems in the aforementioned patented piston cylinder structures where the push rod easily rotates, causing the electric cylinder's anti-rotation mechanism to fail, leading to positioning deviations at the actuator end, loss of load posture control, and damage to the transmission components. Furthermore, long-term use can result in deformation, wear, or even breakage, leading to anti-rotation failure. (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a piston cylinder structure with stable guidance to prevent axial rotation, comprising a piston body, a reversing mechanism above the piston body, a cylinder body on the piston body, a piston inside the cylinder body, a piston sealing ring on the piston, a front cover plate on the right end of the cylinder body, a piston push rod connected to the piston, the piston push rod and the piston being fixed together by a piston retaining ring, a push rod sliding sleeve passing through the front cover plate on the right end of the piston push rod, a guide rod fixing plate on the right end of the front cover plate, four guide rods on the guide rod fixing plate, the left end of each guide rod connected to the piston, and a retaining plate on the rightmost end of the piston push rod, the retaining plate being connected to the right end of the guide rod.

[0007] Preferably, a rear cover plate is provided at the left end of the cylinder body, the rear cover plate is connected to a pressure relief cylinder body, and a pressure relief piston is provided inside the pressure relief cylinder body.

[0008] Preferably, the pressure relief piston is connected to a pressure relief spring, a spring seat is provided at the rear end of the pressure relief cylinder, the spring seat is connected to the tail of the pressure relief spring, and the pressure relief cylinder is provided with a pressure relief hole.

[0009] Preferably, the upper end of the cylinder body is provided with a left pressure inlet and a right pressure inlet, the upper ends of the left pressure inlet and the right pressure inlet are connected to a reversing groove, a reversing block is provided inside the reversing groove, and a worm gear slider is provided inside the reversing block.

[0010] Preferably, a worm gear is provided inside the reversing slot, the worm gear is connected to a worm gear slider, a motor is connected to the left end of the worm gear, a motor frame is provided at the left end of the reversing slot, and the motor frame is connected to the motor.

[0011] Preferably, an air inlet cover is provided at the upper end of the reversing groove, and a reversing sealing ring is provided between the air inlet cover and the reversing groove.

[0012] (III) Beneficial Effects This invention provides a piston cylinder structure with a stable guide that prevents axial rotation. It has the following beneficial effects: This structure features a guide rod fixing plate at the right end of the front cover, upon which four guide rods are mounted. The left end of each guide rod is connected to the piston, and the right end is connected to the retaining plate at the rightmost end of the piston push rod, forming a stable multi-rod guide anti-rotation structure. This novel metal guide rod structure offers significant advantages in withstanding radial torque, enabling long-term stable operation without easily deforming, wearing, or breaking.

[0013] A rear cover plate located at the left end of the cylinder body connects to a pressure relief cylinder body. Inside the pressure relief cylinder body, a pressure relief piston is connected to a pressure relief spring, and a spring seat is located at the rear. A pressure relief hole is also provided on the cylinder body. When the internal pressure of the cylinder body exceeds a set value, the pressure relief piston will move backward under the pressure, overcoming the elastic force of the pressure relief spring, opening the pressure relief hole, and achieving automatic pressure relief. This protects the cylinder body and the entire system from overpressure damage, improving the safety and service life of the equipment.

[0014] The left and right inlet ports at the upper end of the cylinder block are connected to the reversing slot. The reversing block in the reversing slot is connected to the worm through a worm-slider. The worm is driven to rotate by a motor, which in turn moves the reversing block to switch the inlet direction. This electric reversing method has a rapid response and precise control, which can meet the adjustment requirements of piston movement direction and speed under different working conditions. Moreover, the motor is fixed by a motor frame, which makes the structure stable and ensures the reliability and durability of the reversing action. Attached Figure Description

[0015] Figure 1 A schematic diagram of a piston cylinder structure with a stable guide that prevents axial rotation; Figure 2 A cross-sectional view of a piston cylinder block structure with stable guidance to prevent axial rotation. Figure 3 BB is a cross-sectional view of a piston cylinder structure with a stable guide that prevents axial rotation.

[0016] In the diagram: 1. Piston body; 101. Cylinder body; 102. Piston; 103. Piston sealing ring; 104. Piston push rod; 105. Piston retaining ring; 106. Front cover plate; 107. Rear cover plate; 108. Push rod sleeve; 109. Guide rod fixing plate; 110. Guide rod; 111. Retaining plate; 112. Right pressure inlet; 113. Left pressure inlet; 114. Pressure relief cylinder body; 115. Pressure relief piston; 116. Pressure relief spring; 117. Spring seat; 118. Pressure relief hole; 2. Reversing mechanism; 21. Reversing groove; 22. Reversing block; 23. Worm gear slider; 24. Worm; 25. Motor; 26. Motor frame; 27. Inlet cover; 28. Reversing sealing ring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-3This utility model provides a technical solution: a piston cylinder structure with stable guidance to prevent axial rotation, including a piston body 1, a reversing mechanism 2 disposed above the piston body 1, a cylinder 101 disposed on the piston body 1, a rear cover plate 107 disposed on the left end of the cylinder 101, a pressure relief cylinder 114 connected to the rear cover plate 107, a pressure relief piston 115 disposed inside the pressure relief cylinder 114, a pressure relief spring 116 connected to the pressure relief piston 115, and a rear end of the pressure relief cylinder 114 is provided with... A spring seat 117 is provided, which is connected to the tail of the pressure relief spring 116. The pressure relief cylinder body 114 is provided with a pressure relief hole 118. The upper end of the cylinder body 101 is provided with a left pressure inlet hole 113 and a right pressure inlet hole 112. The upper ends of the left pressure inlet hole 113 and the right pressure inlet hole 112 are connected to a reversing groove 21. A reversing block 22 is provided inside the reversing groove 21. A worm gear slider 23 is provided inside the reversing block 22. A worm 24 is provided inside the reversing groove 21. The worm 24 and the worm gear slider 23 are connected. The worm gear 24 is connected to a motor 25 at its left end. A motor frame 26 is located at the left end of the reversing slot 21, and the motor frame 26 is connected to the motor. An air intake cover 27 is located at the upper end of the reversing slot 21, and a reversing sealing ring 28 is located between the air intake cover 27 and the reversing slot 21. A piston 102 is located inside the cylinder body 101, and a piston sealing ring 103 is located on the piston 102. A front cover plate 106 is located at the right end of the cylinder body 101, and a piston push rod 104 is connected to the piston 102. The piston push rod 104 and the piston 102 are fixed together by a piston retaining ring 105. The right end of the piston push rod 104 passes through the front cover plate 106 and is provided with a push rod sleeve 108. The right end of the front cover plate 106 is provided with a guide rod fixing plate 109. The guide rod fixing plate 109 is provided with four guide rods 110. The left end of the guide rod 110 is connected to the piston. The rightmost end of the piston push rod 104 is provided with a retaining plate 111. The retaining plate 111 is connected to the right end of the guide rod 110.

[0019] During operation, external air enters the reversing groove 21 through the air inlet cover 27. The motor 25 drives the worm gear 24 to rotate, and the worm gear 24 drives the worm slider 23, which meshes with it, to move the reversing block 22. This, in turn, pushes the reversing block 22 to slide left and right within the reversing groove 21, realizing the connection and switching between the air source and the left pressure port 113 or the right pressure port 112. When the air source enters the right side of the cylinder body 101 through the right pressure port 112, the gas pushes the piston 102 to the left. The piston 102 drives the piston push rod 104 to the left. During this process, the four guide rods 110 connected to the right end of the piston 102 move synchronously to the left under the guidance of the guide rod fixing plate 109. The retaining plate 111 connected to the right end of the guide rod 110 also moves accordingly. Through the cooperation of the guide rod 110 with the guide rod fixing plate 109 and the retaining plate 111, the axial rotation of the piston push rod 104 is effectively restricted, ensuring its stable linear motion. The piston sealing ring 103 ensures a seal between the piston 102 and the inner wall of the cylinder 101, preventing gas leakage. The push rod sleeve 108 reduces friction between the piston push rod 104 and the front cover plate 106, ensuring smooth movement of the piston push rod 104. When the piston 102 needs to move to the right, the motor 25 reverses, driving the worm gear 24 to rotate in the opposite direction, causing the reversing block 22 to move to a position communicating with the left pressure inlet 113. The air source enters the left side of the cylinder 101 through the left pressure inlet 113, pushing the piston 102 to move to the right, and the piston push rod 104 to move to the right. If the internal pressure of the cylinder 101 rises abnormally and exceeds the set value, the excessive pressure will push the pressure relief piston 115 to move backward against the elastic force of the pressure relief spring 116. When the pressure relief piston 115 moves to expose the pressure relief hole 118, the high-pressure gas in the cylinder is discharged through the pressure relief hole 118, achieving pressure relief and protecting the cylinder and the entire system. After the pressure returns to normal, the pressure relief spring 116 pushes the pressure relief piston 115 to reset and closes the pressure relief port 118.

[0020] In summary, this structure, by setting a guide rod fixing plate at the right end of the front cover and installing four guide rods on it, with the left end of the guide rod connected to the piston and the right end connected to the retaining plate at the rightmost end of the piston push rod, forms a stable multi-rod guide anti-rotation structure. The metal guide rod structure of this invention has significant advantages in withstanding radial torque and can operate stably for a long time without easily deforming, wearing, or breaking.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A piston cylinder structure with a stable guide to prevent axial rotation, comprising a piston body (1), a reversing mechanism (2) disposed above the piston body (1), a cylinder (101) disposed on the piston body (1), a piston (102) disposed inside the cylinder (101), a piston sealing ring (103) disposed on the piston (102), a front cover plate (106) disposed at the right end of the cylinder (101), a piston push rod (104) connected to the piston (102), and the piston push rod (104) and the piston (102) being connected to each other. The piston is fixed by a piston retaining ring (105). The piston push rod (104) is passed through the front cover plate (106) and a push rod sleeve (108) is provided. The right end of the front cover plate (106) is provided with a guide rod fixing plate (109). The guide rod fixing plate (109) is provided with four guide rods (110). The left end of the guide rod (110) is connected to the piston. The rightmost end of the piston push rod (104) is provided with a retaining plate (111). The retaining plate (111) is connected to the right end of the guide rod (110).

2. The piston cylinder structure with stable guidance to prevent axial rotation according to claim 1, characterized in that: The cylinder body (101) is provided with a rear cover plate (107) at the left end, and the rear cover plate (107) is connected to a pressure relief cylinder body (114), and a pressure relief piston (115) is provided inside the pressure relief cylinder body (114).

3. A piston cylinder structure with a stable guide to prevent axial rotation according to claim 2, characterized in that: The pressure relief piston (115) is connected to a pressure relief spring (116), and a spring seat (117) is provided at the rear end of the pressure relief cylinder (114). The spring seat (117) is connected to the tail of the pressure relief spring (116), and the pressure relief cylinder (114) is provided with a pressure relief hole (118).

4. A piston cylinder structure with a stable guide to prevent axial rotation according to claim 1, characterized in that: The cylinder body (101) is provided with a left pressure inlet hole (113) and a right pressure inlet hole (112) at the upper end. The left pressure inlet hole (113) and the right pressure inlet hole (112) are connected to a reversing groove (21) at the upper end. A reversing block (22) is provided inside the reversing groove (21). A worm gear slider (23) is provided inside the reversing block (22).

5. A piston cylinder structure with a stable guide to prevent axial rotation according to claim 4, characterized in that: The reversing groove (21) is provided with a worm (24), which is connected to the worm slider (23). The left end of the worm (24) is connected to a motor (25), and the left end of the reversing groove (21) is provided with a motor frame (26), which is connected to the motor.

6. A piston cylinder structure with a stable guide to prevent axial rotation according to claim 4, characterized in that: An air inlet cover (27) is provided at the upper end of the reversing groove (21), and a reversing sealing ring (28) is provided between the air inlet cover (27) and the reversing groove (21).

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