Rod end sealing assembly and balance cylinder

Abstract

The utility model discloses a rod end sealing assembly and a balance air cylinder, the rod end sealing assembly comprises a piston, the piston comprises a top end face and a bottom end face which are oppositely arranged, the bottom end face is provided with an avoiding groove, a shaft hole is formed in the axial direction of the piston in a penetrating mode, and at least one first sealing groove is formed in the piston; at least one second sealing groove is formed outside the piston; the static sealing ring is arranged in the piston, and the static sealing ring is embedded in the first sealing groove; the piston is sleeved with the sealing ring, and the sealing ring is embedded in the second sealing groove; when the piston rod, the cylinder barrel and the piston are assembled, the piston rod is in clearance fit with the shaft hole; and the piston is in clearance fit with the cylinder barrel. The utility model discloses a rod end sealing assembly and a balance air cylinder. The problem that an existing balance air cylinder is not ideal in use effect is solved.

Description

Technical Field

[0001] The present application relates to the technical field of cylinder accessories, and more specifically, to a rod end seal assembly and a balanced cylinder. Background Art

[0002] In order to achieve high-speed and high-precision response of the Z axis, three-dimensional coordinate measuring equipment usually needs to add a Z-axis balance cylinder to offset the gravity effect of the Z-axis mechanism. In the past, the piston of the balance cylinder was usually connected to the piston rod using high-strength connection structures such as riveting or threaded tightening to ensure a safe and stable connection.

[0003] However, during use, because the stroke of the balancing cylinder is long, the cylinder barrel is usually not straight, and the cylinder barrel and piston are squeezed unevenly during movement. As a suspension balancing cylinder that is very sensitive to force, the speed sluggishness caused by the uneven squeezing force between the cylinder barrel and the piston is very abrupt. This phenomenon will have a negative impact on the performance of the measurement system.

[0004] Therefore, a rod end seal assembly and a balanced cylinder are needed to solve the above problems. Utility Model Content

[0005] In view of this, the purpose of the present application is to propose a rod end sealing assembly and a balancing cylinder to solve the problem that the existing balancing cylinder has an unsatisfactory use effect.

[0006] Based on the above purpose, the present application provides a rod end seal assembly, comprising:

[0007] A piston, wherein the piston comprises a top end face and a bottom end face which are arranged opposite to each other, the bottom end face is provided with an avoidance groove, an axial hole is provided through the axial direction of the piston, at least one first sealing groove is provided inside the piston; at least one second sealing groove is provided outside the piston;

[0008] A static sealing ring, which is arranged in the piston and embedded in the first sealing groove;

[0009] A sealing ring, which is sleeved outside the piston and embedded in the second sealing groove;

[0010] When the piston rod, the cylinder barrel and the piston are assembled, the piston rod and the shaft hole are clearance-matched; and the piston and the cylinder barrel are clearance-matched.

[0011] Optionally, a mounting groove is provided in the circumferential direction of the piston, and a wear-resistant ring sleeve is provided outside the piston and embedded in the mounting groove.

[0012] Optionally, two second sealing grooves are provided, which are respectively provided between the installation groove and the top end surface, and between the installation groove and the bottom end surface.

[0013] Optionally, the number of the first sealing grooves is two, and the first sealing grooves are sequentially and spaced apart from each other along the axial direction of the piston between the avoidance groove and the top end surface.

[0014] The present application also provides a balanced cylinder, comprising:

[0015] A cylinder, wherein the two opposite ends of the cylinder are respectively connected with a front cover and a rear cover; the front cover and the rear cover are respectively provided with a first gas path and a second gas path, the first gas path is connected with a gas source, and the second gas path is connected with an external environment;

[0016] A piston rod, the piston rod comprising a driving end and a stop end which are arranged opposite to each other, the stop end passing through the front end cover and entering into the cylinder barrel, and being provided with a piston stop end head;

[0017] As in the rod end seal assembly described above, the rod end seal assembly is disposed in the cylinder, the piston divides the cylinder into a front chamber and a rear chamber, and the first gas path and the second gas path are respectively connected to the front chamber and the rear chamber;

[0018] The piston rod is inserted into the axial hole of the piston, the avoidance groove cover is arranged outside the piston stop end, the static sealing ring in the first sealing groove is sleeved on the piston rod, and the piston rod and the axial hole are clearance-matched; the piston and the cylinder barrel are clearance-matched, and the sealing ring in the second sealing groove is in contact with the cylinder barrel.

[0019] Optionally, both the front cover and the rear cover are provided with a base at one end facing the cylinder, and a hollow structure is provided on the base, and the first air path and the second air path are respectively connected to the front cavity and the rear cavity through the corresponding hollow structures of the base.

[0020] Optionally, a sealing bushing is provided in the front end cover, and the piston rod passes through the sealing bushing.

[0021] Optionally, a sealing groove is provided in the sealing bushing, a piston rod sealing ring is provided in the sealing groove, and the piston rod sealing ring is sleeved on the piston rod.

[0022] Optionally, a connecting structure is provided at one end of the rear end cover facing away from the cylinder barrel.

[0023] Optionally, a muffler is provided on the second gas path.

[0024] From the above, it can be seen that the rod end seal assembly and the balancing cylinder provided by the present application have the following advantages compared with the prior art: by adopting the above-mentioned rod end seal assembly, a gap is provided between the piston and the piston rod to eliminate the influence of concentricity generated during the assembly process, and the static seal ring is used to improve the sealing of the piston. A gap is provided between the piston and the cylinder barrel to eliminate the influence of concentricity generated during the assembly process, and the seal ring is used to improve the sealing of the piston. A piston with a floating mechanism can float back and forth in the radial direction and in the axial direction in the cylinder barrel, and can form good adaptability within the full stroke of the balancing cylinder, adapt to the different friction response levels of the piston rod and the piston barrel, and eliminate the influence of coaxiality generated during the assembly process, so that the force on the piston is as stable as possible, ensuring the application effect of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above-mentioned features and technical advantages of the present application will become clearer and easier to understand through the following description of its embodiments in conjunction with the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of a balanced cylinder with a rod end seal assembly used in a specific embodiment of the present application.

[0027] Figure 2 for Figure 1 A partial enlarged schematic diagram of a balanced cylinder including a rod end seal assembly is shown.

[0028] Figure 3 for Figure 1 Schematic diagram of the rod end seal assembly is shown.

[0029] Figure 4 for Figure 1 The structural schematic diagram of the balanced cylinder with a rod end seal assembly is shown.

[0030] Figure 5 for Figure 4 A partial enlarged schematic diagram of a balanced cylinder including a rod end seal assembly is shown.

[0031] The reference numerals are:

[0032] 1. Sealing bushing; 2. Rear end cover; 3. Front end cover; 4. Base; 5. Piston rod; 6. Piston; 7. Cylinder; 8. Sealing ring; 9. Static sealing ring; 10. Wear-resistant ring; 11. Single earring; 12. Muffler; 13. Mounting nut; 14. Piston stop end; 15. Piston rod sealing ring; First air port ①; Second air port ②. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. The same parts are represented by the same figure numerals. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings. The words "inside" and "outside" used refer to the direction toward or away from the geometric center of a specific component, respectively.

[0034] The Z axis of the three-dimensional coordinate measuring device is the vertical direction (i.e. the direction of gravity), and the X axis is the horizontal direction.

[0035] Figure 1 It is a schematic diagram of a balanced cylinder with a rod end seal assembly used in a specific embodiment of the present application. Figure 2 for Figure 1 A partial enlarged schematic diagram of a balanced cylinder including a rod end seal assembly is shown. Figure 3 for Figure 1 Schematic diagram of the rod end seal assembly is shown. Figure 4 for Figure 1 The structural schematic diagram of the balanced cylinder with a rod end seal assembly is shown. Figure 5 for Figure 4 The enlarged schematic diagram of the part of the balance cylinder including the rod end seal assembly is shown. Figures 1 to 5 As shown, the rod end sealing assembly includes a piston 6, a static sealing ring 9 and a sealing ring 8.

[0036] The piston 6 includes a top end surface and a bottom end surface which are arranged opposite to each other, the bottom end surface is provided with an avoidance groove, an axial hole is provided in the axial direction of the piston 6, at least one first sealing groove is provided in the piston 6; at least one second sealing groove is provided outside the piston 6; a static sealing ring 9 is provided in the piston 6 and embedded in the first sealing groove; a sealing ring 8 is sleeved on the outside of the piston 6 and embedded in the second sealing groove; when the piston rod 5, the cylinder barrel 7 and the piston 6 are assembled, the piston rod 5 and the axial hole are clearance-matched; the piston 6 and the cylinder barrel 7 are clearance-matched.

[0037] When the piston rod 5 is inserted into the piston 6, the piston rod 5 and the shaft hole are in clearance; the avoidance groove cover is arranged outside the piston stop end 14 of the piston 6, and the piston stop end 14 can drive the piston 6 to slide upward and stop the piston 6 downward; the static seal ring 9 is arranged in the first seal groove, and when the piston rod 5 is inserted into the first seal groove, the static seal ring 9 is sleeved on the piston rod 5. When the piston 6 is located in the cylinder 7, the piston 6 and the cylinder 7 are in clearance, and the seal ring 8 is sleeved outside the piston 6 and embedded in the second seal groove.

[0038] The above-mentioned rod end seal assembly is adopted, and a gap is provided between the piston 6 and the piston rod 5 to eliminate the influence of concentricity generated during the assembly process, and the static seal ring 9 is used to improve the sealing performance of the piston 6. A gap is provided between the piston 6 and the cylinder barrel 7 to eliminate the influence of concentricity generated during the assembly process, and the seal ring 8 is used to improve the sealing performance of the piston 6. The piston 6 with a floating mechanism can float back and forth in the radial direction and in the axial direction in the cylinder barrel 7, and can form good adaptability within the full stroke of the balancing cylinder, adapt to the different friction response levels of the piston rod 5 and the piston 6 barrel, eliminate the influence of coaxiality generated during the assembly process, so that the force on the piston 6 is as stable as possible, ensuring the application effect of the product.

[0039] Optionally, a mounting groove is provided in the circumferential direction of the piston 6, and the wear-resistant ring 10 is sleeved outside the piston 6 and embedded in the mounting groove. The wear-resistant ring 10 is embedded in the mounting groove, and the wear-resistant ring 10 slightly protrudes from the surface of the piston 6. By providing the wear-resistant ring 10, the overall structural performance of the piston 6 is improved.

[0040] In one embodiment of the present application, the wear-resistant ring 10 is disposed in the middle of the piston 6 .

[0041] Optionally, two second sealing grooves are provided, which are respectively provided between the mounting groove and the top end surface, and between the mounting groove and the bottom end surface. By installing sealing rings 8 at both opposite ends of the piston 6, the sealing performance of the piston 6 during operation is improved.

[0042] In one embodiment of the present application, two second sealing grooves are symmetrically arranged along the mounting groove.

[0043] Optionally, two first sealing grooves are provided, and are sequentially arranged between the avoidance groove and the top end surface at intervals along the axial direction of the piston 6. By arranging two static sealing rings 9 on the piston rod 5, the connection tightness and sealing performance between the piston 6 and the piston rod 5 are improved.

[0044] In one embodiment of the present application, the two first sealing grooves are respectively an upper first sealing groove and a lower first sealing groove, the upper first sealing groove has a certain distance from the top end surface of the piston 6, there is a certain distance between the two first sealing grooves, and the lower first sealing groove has a certain distance from the avoidance groove.

[0045] like Figure 1 and Figure 4 As shown, the present application also provides a balanced cylinder, comprising: a cylinder barrel 7, a piston rod 5 and a rod end sealing assembly as described above.

[0046] The front end cover 3 and the rear end cover 2 are connected to the opposite ends of the cylinder 7 respectively; the front end cover 3 and the rear end cover 2 are respectively provided with a first gas path and a second gas path, the first gas path is connected to the gas source, and the second gas path is connected to the external environment; the cylinder 7 has a hollow structure, the front end cover 3 and the rear end cover 2 respectively seal the opposite ends of the cylinder 7, the first gas path is used to connect the gas source and the cylinder 7, and the second gas path is used to connect the cylinder 7 with the external environment. The gas source is usually used to provide compressed gas.

[0047] The piston rod 5 includes a driving end and a stop end which are arranged opposite to each other. The stop end passes through the front cover 3 and enters the cylinder barrel 7, and is provided with a piston stop end head 14. The driving end is located outside the cylinder barrel 7 and is usually connected to a driving mechanism, which drives the driving end to drive the piston rod 5 to move back and forth. The stop end passes through the front cover 3 and enters the cylinder barrel 7, and the piston 6 brakes the end head, so that the movement range of the piston rod 5 is limited between the front cover 3 and the rear cover 2.

[0048] The rod end seal assembly is arranged in the cylinder 7, and the piston 6 divides the cylinder 7 into a front chamber and a rear chamber, and the first gas path and the second gas path are connected to the front chamber and the rear chamber respectively; when the piston rod 5 moves upward, the piston stop end 14 pushes the piston 6 to move synchronously, and when the piston rod 5 moves downward, when the piston stop end 14 stops, the piston 6 will be restricted from further moving. When the piston rod 5 is inserted into the piston 6, the piston rod 5 and the shaft hole are in clearance; the avoidance groove cover is arranged outside the piston stop end 14 of the piston 6, and the piston stop end 14 can drive the piston 6 to slide upward and can stop the piston 6 downward; the static seal ring 9 is arranged in the first sealing groove, and when the piston rod 5 is inserted into the first sealing groove, the static seal ring 9 is sleeved on the piston rod 5. When the piston 6 is located in the cylinder 7, the piston 6 and the cylinder 7 are in clearance, and the seal ring 8 is sleeved outside the piston 6 and embedded in the second sealing groove.

[0049] The piston rod 5 is passed through the axial hole of the piston 6, the avoidance groove cover is arranged outside the piston stop end 14, the static sealing ring 9 in the first sealing groove is sleeved on the piston rod 5, and the piston rod 5 and the axial hole are clearance-matched; the piston 6 and the cylinder barrel 7 are clearance-matched, and the sealing ring 8 in the second sealing groove is in contact with the cylinder barrel 7.

[0050] The balancing cylinder (such as the piston rod 5) is connected to the X-axis horizontal slider of the three-dimensional coordinate measuring device. The balancing cylinder (such as the cylinder barrel 7) is connected to the upper and lower mechanisms of the Z-axis of the three-dimensional coordinate measuring device. The balancing cylinder uses a one-way air intake structure, the first air port ① is connected to the compressed air with adjusted air pressure, and the second air port ② is connected to the atmosphere. Compressed air with appropriate air pressure is introduced into the first air port ① to push the output of the balancing cylinder to balance the external load. The actions that the balancing mechanism can achieve include: the first action includes: by providing the first air port with compressed air with adjusted pressure, the force generated by the balancing cylinder and the gravity generated by the Z-axis device are offset, thereby achieving balance. The second action includes: the Z-axis (i.e., the direction of gravity) moves downward under the drive of the motor, the gas in the balancing cylinder is discharged from the cylinder through the first air port ①, the piston rod 5 drives the piston 6 to move from bottom to top, the front cavity is reduced, the rear cavity is enlarged, and then discharged through the pressure regulating valve. The second opening ② inhales an appropriate amount of normal pressure air. The third action includes: the Z axis moves upward under the drive of the motor, the gas in the balance cylinder enters the cylinder through the first air port ①, the piston rod 5 drives the piston 6 to move from top to bottom, the front cavity increases, the rear cavity decreases, and then replenished through the pressure regulating valve. The second opening ② discharges a proper amount of normal pressure air.

[0051] The above-mentioned balancing cylinder is used, and a gap is provided between the piston 6 and the piston rod 5 to eliminate the influence of concentricity generated during the assembly process, and the static sealing ring 9 is used to improve the sealing of the piston 6. A gap is provided between the piston 6 and the cylinder barrel 7 to eliminate the influence of concentricity generated during the assembly process, and the sealing ring 8 is used to improve the sealing of the piston 6. The piston 6 with a floating mechanism can float back and forth in the radial direction and the axial direction in the cylinder barrel 7, and can form good adaptability within the full stroke of the balancing cylinder, adapt to the different friction response levels of the piston rod 5 and the piston 6 barrel, eliminate the influence of coaxiality generated during the assembly process, so that the force on the piston 6 is as stable as possible, ensuring the application effect of the product.

[0052] In one embodiment of the present application, the avoidance groove is relatively slightly wider than the piston stop end 14 , that is, there is a gap in the radial direction of the piston 6 .

[0053] In order to ensure the use effect of the product, optionally, both the front cover 3 and the rear cover 2 are provided with a base 4 at one end facing the cylinder 7, and a hollow structure is provided on the base 4. The first air path and the second air path are respectively connected to the front cavity and the rear cavity through the corresponding hollow structure of the base 4. The hollow structure is used to guide the movement of the airflow. The first air port ① of the first air path is set on the side of the front cover 3, and the second opening ② of the second air path is set on the side of the rear cover 2. By providing the first air port with compressed air with adjusted pressure, the force generated by the balance cylinder and the gravity generated by the Z-axis device are offset, so as to achieve balance. For example, the Z axis (i.e., the direction of gravity) moves downward under the drive of the motor, and the gas in the balance cylinder is discharged from the cylinder through the first air port ①, and the piston rod 5 drives the piston 6 to move from bottom to top, the front cavity is reduced, and the rear cavity is enlarged, and then discharged through the pressure regulating valve. The second opening ② inhales an appropriate amount of normal pressure air. For another example, the Z axis moves upward under the drive of the motor, and the gas in the balance cylinder enters the cylinder through the first air port ①, and the piston rod 5 drives the piston 6 to move from top to bottom, the front cavity increases, and the rear cavity decreases, and then it is supplemented through the pressure regulating valve. The second opening ② discharges a proper amount of normal pressure air.

[0054] In one embodiment of the present application, the front end cover 3 includes a front end cover 3 main body, the top end of the front end cover 3 main body (the end away from the cylinder 7) has a sealing cover, the bottom end of the front end cover 3 main body is connected to the cylinder 7, the front end cover 3 main body has a hollow structure in the axial direction, and a sealing sleeve 1 and a base 4 are sequentially arranged from the top end to the bottom end, and the sealing rod is sequentially inserted through the sealing cover, the sealing sleeve 1 and the base 4, and a first air port ① is arranged on the side of the front end cover 3 main body, and the first air port ① is connected to the base 4 to form a first air path.

[0055] In one embodiment of the present application, the rear end cover 2 includes a rear end cover 2 main body, the bottom end of the rear end cover 2 main body (the end away from the cylinder 7) has a connecting structure, and the connecting structure is connected to the mating part; the top end of the rear end cover 2 main body is connected to the cylinder 7, and the top end of the rear end cover 2 main body is provided with a base 4, and the piston stop end 14 of the sealing rod can contact the base 4, and the side of the rear end cover 2 main body is provided with a second air port ②, and the second air port ② is connected to the base 4 to form a second air path.

[0056] Optionally, a sealing bushing 1 is provided in the front end cover 3, and the piston rod 5 is passed through the sealing bushing 1. The sealing bushing 1 is provided relatively above the base 4, that is, the bottom end of the base 4 is connected to the cylinder 7, and the sealing bushing 1 is provided at the top end of the base 4. The sealing bushing 1 improves the sealing performance and wear resistance of the front end cover 3.

[0057] Optionally, a sealing groove is provided in the sealing bushing 1, a piston rod sealing ring 15 is provided in the sealing groove, and the piston rod sealing ring 15 is sleeved on the piston rod 5. The sealing rod is penetrated through the sealing bushing 1 and the sealing groove, and the piston rod sealing ring 15 is sleeved on the sealing rod to improve the sealing performance of the front end cover 3.

[0058] Optionally, a connection structure is provided at one end of the rear end cover 2 facing away from the cylinder barrel 7. The connection structure is used to achieve the connection between the balancing cylinder and a matching part (such as a three-coordinate measuring device).

[0059] In one embodiment of the present application, the connection structure includes but is not limited to a single earring 11, and the single earring 11 is provided on the mating piece. When the two single earrings 11 are arranged opposite to each other, they are hingedly connected by a pin.

[0060] Optionally, the second gas circuit is provided with a muffler 12. By providing the muffler 12, the noise generated during the operation of the second gas circuit and the balancing cylinder can be reduced, and the performance of the balancing cylinder can be improved.

[0061] The following further introduces the use of the rod end seal assembly and the balancing cylinder.

[0062] Install the static seal ring 9 in the first seal groove, install the seal ring 8 in the second seal groove, install the wear-resistant ring 10 in the installation groove, and assemble the seals into a rod end seal assembly.

[0063] The driving end of the piston rod 5 is inserted through the avoidance groove, the shaft hole and the static seal ring 9, and the piston stop end 14 is located in the avoidance groove. Assemble the rear end cover 2 and the cylinder barrel 7, place the stop end of the piston rod 5 and the rod end seal assembly in the cylinder barrel 7, and the piston 6 divides the hollow structure of the cylinder barrel 7 into a front cavity and a rear cavity; assemble the front end cover 3 and the cylinder barrel 7, and the driving end is inserted through the base 4, the sealing bushing 1, the piston rod seal ring 15 and the front end cover 3, and extends out of the cylinder barrel 7. A mounting nut 13 is provided on the front end cover 3, and a single earring 11 is provided on the rear end cover 2. The first air port ① and the second air port ② are respectively provided on the front end cover 3 and the rear end cover 2, and a muffler 12 is installed on the second air path. The first air path is connected to the front cavity through the base 4 in the front end cover 3, and the second air path is connected to the rear cavity through the base 4 in the rear end cover 2.

[0064] When the piston rod 5 is inserted into the piston 6, the piston rod 5 and the shaft hole are in clearance; the avoidance groove cover is arranged outside the piston stop end 14 of the piston 6, and the piston stop end 14 can drive the piston 6 to slide upward and stop the piston 6 downward; the static seal ring 9 is arranged in the first seal groove, and when the piston rod 5 is inserted into the first seal groove, the static seal ring 9 is sleeved on the piston rod 5. When the piston 6 is located in the cylinder 7, the piston 6 and the cylinder 7 are in clearance, and the seal ring 8 is sleeved outside the piston 6 and embedded in the second seal groove.

[0065] The balancing cylinder (such as the piston rod 5) is connected to the X-axis horizontal slider of the three-dimensional coordinate measuring device. The balancing cylinder (such as the cylinder barrel 7) is connected to the upper and lower mechanisms of the Z-axis of the three-dimensional coordinate measuring device. The balancing cylinder uses a one-way air intake structure, the first air port ① is connected to the compressed air with adjusted air pressure, and the second air port ② is connected to the atmosphere. Compressed air with appropriate air pressure is introduced into the first air port ① to push the output of the balancing cylinder to balance the external load. The actions that the balancing mechanism can achieve include: the first action includes: by providing the first air port with compressed air with adjusted pressure, the force generated by the balancing cylinder and the gravity generated by the Z-axis device are offset, thereby achieving balance. The second action includes: the Z-axis (i.e., the direction of gravity) moves downward under the drive of the motor, the gas in the balancing cylinder is discharged from the cylinder through the first air port ①, the piston rod 5 drives the piston 6 to move from bottom to top, the front cavity is reduced, the rear cavity is enlarged, and then discharged through the pressure regulating valve. The second opening ② inhales an appropriate amount of normal pressure air. The third action includes: the Z axis moves upward under the drive of the motor, the gas in the balance cylinder enters the cylinder through the first air port ①, the piston rod 5 drives the piston 6 to move from top to bottom, the front cavity increases, the rear cavity decreases, and then replenished through the pressure regulating valve. The second opening ② discharges a proper amount of normal pressure air.

[0066] From the above description and practice, it can be known that the rod end seal assembly and the balanced cylinder provided by the present application have the following advantages compared with the prior art: by adopting the above-mentioned rod end seal assembly, a gap is provided between the piston and the piston rod to eliminate the influence of concentricity generated during the assembly process, and the static seal ring is used to improve the sealing of the piston. A gap is provided between the piston and the cylinder barrel to eliminate the influence of concentricity generated during the assembly process, and the seal ring is used to improve the sealing of the piston. A piston with a floating mechanism can float back and forth in the radial direction and in the axial direction in the cylinder barrel, and can form good adaptability within the full stroke of the balanced cylinder, adapt to the different friction response levels of the piston rod and the piston barrel, and eliminate the influence of coaxiality generated during the assembly process, so that the force on the piston is as stable as possible, ensuring the application effect of the product.

[0067] A person skilled in the art should understand that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present application should be included in the protection scope of the present application.

Claims

1. A rod end seal assembly, characterized in that: include: A piston, wherein the piston comprises a top end face and a bottom end face which are arranged opposite to each other, the bottom end face is provided with an avoidance groove, an axial hole is provided through the axial direction of the piston, at least one first sealing groove is provided inside the piston; at least one second sealing groove is provided outside the piston; A static sealing ring, which is arranged in the piston and embedded in the first sealing groove; A sealing ring, which is sleeved outside the piston and embedded in the second sealing groove; When the piston rod, the cylinder barrel and the piston are assembled, the piston rod and the shaft hole are clearance-matched; and the piston and the cylinder barrel are clearance-matched.

2. The rod end seal assembly according to claim 1, characterized in that: A mounting groove is arranged in the circumferential direction of the piston, and a wear-resistant ring sleeve is arranged outside the piston and embedded in the mounting groove.

3. The rod end seal assembly according to claim 2, characterized in that: The second sealing grooves are provided in two numbers, which are respectively provided between the installation groove and the top end surface, and between the installation groove and the bottom end surface.

4. The rod end seal assembly according to any one of claims 1 to 3, characterized in that: The number of the first sealing grooves is two, and the first sealing grooves are sequentially arranged between the avoidance groove and the top end surface at intervals along the axial direction of the piston.

5. A balancing cylinder, characterized in that: include: A cylinder, wherein the two opposite ends of the cylinder are respectively connected with a front cover and a rear cover; the front cover and the rear cover are respectively provided with a first gas path and a second gas path, the first gas path is connected with a gas source, and the second gas path is connected with an external environment; A piston rod, the piston rod comprising a driving end and a stop end which are arranged opposite to each other, the stop end passing through the front end cover and entering into the cylinder barrel, and being provided with a piston stop end head; The rod end seal assembly according to any one of claims 1 to 4, wherein the rod end seal assembly is disposed in the cylinder, the piston divides the cylinder into a front chamber and a rear chamber, and the first gas path and the second gas path are respectively connected to the front chamber and the rear chamber; The piston rod is inserted into the axial hole of the piston, the avoidance groove cover is arranged outside the piston stop end, the static sealing ring in the first sealing groove is sleeved on the piston rod, and the piston rod and the axial hole are clearance-matched; the piston and the cylinder barrel are clearance-matched, and the sealing ring in the second sealing groove is in contact with the cylinder barrel.

6. The balancing cylinder according to claim 5, characterized in that: The front end cover and the rear end cover are both provided with a base at one end facing the cylinder, and the base is provided with a hollow structure. The first gas path and the second gas path are respectively connected with the front cavity and the rear cavity through the corresponding hollow structures of the base.

7. The balancing cylinder according to claim 5 or 6, characterized in that: A sealing bushing is arranged in the front end cover, and the piston rod passes through the sealing bushing.

8. The balancing cylinder according to claim 7, characterized in that: A sealing groove is arranged in the sealing bushing, a piston rod sealing ring is arranged in the sealing groove, and the piston rod sealing ring is sleeved on the piston rod.

9. The balancing cylinder according to claim 5 or 6, characterized in that: The end of the rear end cover facing away from the cylinder barrel is provided with a connection structure.

10. The balancing cylinder according to claim 5 or 6, characterized in that: The second gas path is provided with a muffler.

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