Brake oil cylinder with spring convenient to replace

Abstract

The invention relates to a brake oil cylinder convenient for replacing a spring, which belongs to the technical field of hydraulic oil cylinders and comprises a cylinder body, a piston rod and a cylinder cover, a spring seat is arranged at the front end of the piston rod, a buffer spring is arranged between the spring seat and the cylinder body, a rotating ring is rotatably arranged in the spring seat, a guide rail is fixedly arranged on the rotating ring, and a plurality of arc-shaped bumps a are circumferentially arranged on the guide rail. A plurality of arc-shaped protruding blocks b are arranged on the circumference of the rotating ring, a plurality of supporting rods a and a plurality of supporting rods b are arranged on the circumference of the spring seat in a sliding mode, arc-shaped clamping plates are connected to the bottoms of the supporting rods a and the bottoms of the supporting rods b, and when the rotating ring rotates, the arc-shaped protruding blocks a and the arc-shaped protruding blocks b make contact with the supporting rods a and the supporting rods b correspondingly to drive the arc-shaped clamping plates to clamp the piston rod. The spring seat can be taken down only by rotating the rotating ring clockwise to enable the arc-shaped clamping plate to rise and reset to relieve clamping on the piston rod, and then the buffer spring can be taken down, so that the replacement mode is simpler and more convenient, and the replacement time is effectively saved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, and in particular to a brake cylinder which is convenient for replacing a spring. Background Art

[0002] The brake cylinder is a common hydraulic brake system component. Due to its reliability and key role in the hydraulic brake system, it is used in almost all mobile machinery that requires precise speed control and stopping. It is responsible for converting the pressure of the oil into mechanical force. The brake fluid is compressed in the cylinder, pushing the piston to move, thereby achieving the braking effect. The buffer spring is an important component in the brake cylinder. It can reduce the impact and vibration of the piston rod, prevent the piston from being over-compressed, and avoid damage to the internal structure of the cylinder. In addition, the buffer spring can help the piston rod quickly return to the initial position to prepare for the next braking, thereby improving the response speed of the brake system. Long-term use and frequent braking operations may cause fatigue, deformation or damage to the buffer spring, resulting in a decrease in the performance of the buffer spring. Therefore, the buffer spring needs to be replaced and maintained regularly. When replacing the buffer spring, the brake cylinder of the prior art usually needs to completely disassemble the entire brake cylinder and then remove the buffer spring. The replacement method is relatively cumbersome and inconvenient, and the replacement time is too long.

[0003] A Chinese invention patent with the announcement number CN118622884A discloses a brake oil cylinder with an easily replaceable spring, belonging to the technical field of hydraulic oil cylinders. It includes a cylinder body, one end of which is closed as the tail end, and a connecting hole is arranged in the center of the tail end, and the other end is open as the front end, and a front end cover with a central opening is arranged at the front end, and a piston push assembly is arranged in the inner cavity of the cylinder body through the central opening of the front end cover, and a composite bushing assembly is arranged at the tail end of the cylinder body and the outer end of the piston push assembly, and a relief spring is arranged on the cylinder body jacket between the composite bushing assemblies, wherein the composite bushing assembly includes a connecting piece and a spring seat detachably connected to the connecting piece. Through the present invention, the detachably connected spring seat enables the oil cylinder to be quickly replaced by only disassembling the spring seat when replacing the relief spring, and at the same time, the spring seat and the connecting piece are connected by a rotating clamping method, so that maintenance personnel can quickly disassemble the spring seat.

[0004] However, the connection method between the spring seat and the connecting piece is still relatively complicated, and the spring seat and the connecting piece are not convenient to disassemble. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and provide a brake cylinder that is easy to replace a spring, comprising a cylinder body and a piston rod slidably arranged in the cylinder body, a cylinder cover is arranged between the cylinder body and the piston rod, a spring seat is arranged at the front end of the piston rod, a buffer spring is arranged between the spring seat and the cylinder body, a rotating ring is rotatably arranged in the spring seat, a guide rail is fixedly arranged on the rotating ring, a plurality of arc-shaped protrusions a are circumferentially arranged on the guide rail, a plurality of arc-shaped protrusions b are circumferentially arranged on the rotating ring, a plurality of support rods a and support rods b are circumferentially slidably arranged on the spring seat, and an arc-shaped clamping plate is fixedly connected to the bottom of the support rods a and support rods b, thereby solving the problem that the brake cylinder in the prior art is complicated and inconvenient to disassemble and assemble when replacing the buffer spring.

[0006] The technical solutions of the present invention are as follows: A brake oil cylinder which is convenient for replacing a spring comprises a cylinder body and a piston rod slidably arranged in the cylinder body, a cylinder cover is arranged between the cylinder body and the piston rod, a spring seat is arranged at the front end of the piston rod, a buffer spring is arranged between the spring seat and the cylinder body, a rotating ring is rotatably arranged in the spring seat, a guide rail is fixedly arranged on the rotating ring, a plurality of arc-shaped protrusions a are circumferentially arranged on the guide rail, a plurality of arc-shaped protrusions b are circumferentially arranged on the rotating ring, a plurality of support rods a and support rods b are circumferentially slidably arranged on the spring seat, an arc-shaped clamping plate is fixedly connected to the bottom of the support rod a and support rod b, and when the rotating ring rotates, the arc-shaped protrusions a and the arc-shaped protrusions b respectively contact the support rod a and support rod b to drive the arc-shaped clamping plate to clamp the piston rod.

[0007] As a preference, a rotation groove is provided on the spring seat, a limiting groove is provided on the inner side of the spring seat, limiting holes are provided at both ends of the limiting groove, and a plurality of through holes a and through holes b are respectively provided on the spring seat for the support rod a and the support rod b.

[0008] As a preferred embodiment, a plurality of threaded holes a are provided on the front side of the spring seat, and fastening bolts are provided in the threaded holes a.

[0009] As a preferred embodiment, sliders are fixedly provided at the upper and lower ends of the rotating ring corresponding to the limit grooves, limit blocks are fixedly provided at the two ends of the slider corresponding to the limit holes, and a threaded hole b is opened on the front side of the slider corresponding to the threaded hole a.

[0010] As a preference, the support rod a and the support rod b are respectively sleeved with a return spring a and a return spring b, the top of the support rod a is fixedly provided with a spherical block a, and the top of the support rod b is fixedly provided with a spherical block b.

[0011] As a preferred embodiment, an anti-slip pad is provided at the bottom of the arc-shaped clamping plate.

[0012] As a preferred embodiment, the front end of the piston rod is fixedly provided with a rod head, the front end of the piston rod is provided with an oil inlet, the tail end of the piston rod is sequentially provided with a one-way valve, a return oil valve base, a return oil valve core, an return oil valve body, a piston body and a piston end cover, and a unloading spring is provided between the return oil valve base and the return oil valve core.

[0013] As a preferred embodiment, a dust ring, an O-ring, a sealing ring, a step seal, a baffle and a steel-backed bearing are arranged between the piston rod and the cylinder cover.

[0014] As a preferred embodiment, a Gly ring and a support ring are provided between the piston rod and the cylinder body.

[0015] As another preferred embodiment, an oil return port is provided at the rear end of the cylinder body.

[0016] The present invention has the following beneficial effects.

[0017] The spring seat in the present invention is provided with a plurality of support rods a and support rods b for circumferential sliding, and the bottoms of the support rods a and support rods b are fixedly connected with an arc-shaped clamping plate. When installing the spring seat, it is only necessary to rotate the rotating ring counterclockwise, and the arc-shaped protrusions a and arc-shaped protrusions b provided on the rotating ring cooperate with the support rods a and support rods b to make the arc-shaped clamping plate descend to clamp the piston rod. When disassembling the spring seat, it is only necessary to rotate the rotating ring clockwise to make the arc-shaped clamping plate rise and reset to release the clamping of the piston rod, so that the spring seat can be removed, and then the buffer spring can be removed, so that the replacement of the buffer spring is simpler and more convenient, and the replacement time is effectively saved.

[0018] The present invention is provided with a rotating ring, which is rotatably arranged in the spring seat, and the sliding blocks arranged at the upper and lower ends of the rotating ring cooperate with the limiting holes at the two ends of the limiting groove inside the spring seat to limit and fix the rotating ring, and fix the arc-shaped clamping plate after the piston rod is clamped, so that the spring seat can be firmly and stably limited on the piston rod.

[0019] In summary, the present invention has the advantages of convenient disassembly and assembly, firm and stable connection, good linkage effect, ingenious structure, etc., and is suitable for the technical field of hydraulic cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 The cross-sectional structure diagram of the brake oil cylinder which is convenient for replacing the spring; Figure 2 for Figure 1 A magnified schematic diagram of point A; Figure 3 It is a schematic diagram of the cross-sectional structure of the spring seat; Figure 4 is a schematic diagram of the structure of the rotating ring; Figure 5is a schematic diagram of the position structure of the rotating ring; Figure 6 It is a schematic diagram of the position structure of the arc splint; Figure 7 It is a schematic diagram of the state when the arc-shaped clamping plate does not clamp the piston rod; Figure 8 is a schematic diagram of the state when the arc-shaped protrusion a is not in contact with the support rod a; Fig. 9 It is a schematic diagram of the state when the arc-shaped clamping plate clamps the piston rod; Fig.10 It is a schematic diagram of the state after the arc-shaped protrusion a squeezes the support rod a to drive the support rod a and the arc-shaped clamping plate to descend; Fig.11 It is a schematic diagram of the structure when the arc-shaped clamp clamps the piston rod.

[0021] In the figure: cylinder body 1, piston rod 2, cylinder head 3, spring seat 4, buffer spring 5, rotating ring 6, Gly ring 11, support ring 12, oil return port 13, rod head 21, oil inlet 22, one-way valve 23, oil return valve base 24, oil return valve core 25, oil return valve body 26, piston body 27, piston end cover 28, unloading spring 29, dust ring 31, O-ring 32, sealing ring 33, Step seal 34, baffle 35, steel back bearing 36 , support rod a41, support rod b42, arc-shaped clamping plate 43, rotating groove 44, limiting groove 45, limiting hole 46, through hole a47, through hole b48, threaded hole a49, fastening bolt 410, return spring a411, return spring b412, spherical block a413, spherical block b414, anti-slip pad 415, guide rail 61, arc-shaped protrusion a62, arc-shaped protrusion b63, slider 64, limiting block 65, threaded hole b66. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0023] Embodiment 1

[0024] like Figures 1 to 11As shown, a brake cylinder which is convenient for replacing a spring comprises a cylinder body 1 and a piston rod 2 which is slidably arranged in the cylinder body 1, a cylinder cover 3 is arranged between the cylinder body 1 and the piston rod 2, a spring seat 4 is arranged at the front end of the piston rod 2, a buffer spring 5 is arranged between the spring seat 4 and the cylinder body 1, a rotating ring 6 is rotatably arranged in the spring seat 4, a guide rail 61 is fixedly arranged on the rotating ring 6, a plurality of arc-shaped protrusions a62 are arranged on the circumference of the guide rail 61, a plurality of arc-shaped protrusions b63 are arranged on the circumference of the rotating ring 6, a plurality of support rods a41 and support rods b42 are slidably arranged on the spring seat 4, an arc-shaped clamping plate 43 is fixedly connected to the bottom of the support rods a41 and b42, and when the rotating ring 6 rotates, the arc-shaped protrusions a62 and the arc-shaped protrusions b63 respectively contact the support rods a41 and b42 to drive the arc-shaped clamping plate 43 to clamp the piston rod 2. A plurality of support rods a41 and b42 are provided on the spring seat 4 for circular sliding. The bottom of the support rods a41 and b42 are fixedly connected with an arc-shaped clamping plate 43. When installing the spring seat 4, it is only necessary to rotate the rotating ring 6 counterclockwise, and the arc-shaped protrusions a62 and b63 provided on the rotating ring 6 cooperate with the support rods a41 and b42 to make the arc-shaped clamping plate 43 descend to clamp the piston rod 2. When disassembling the spring seat 4, it is only necessary to rotate the rotating ring 6 clockwise to make the arc-shaped clamping plate 43 rise and reset to release the clamping of the piston rod 2, so that the spring seat 4 can be removed, and then the buffer spring 5 can be removed, making the replacement of the buffer spring 5 simpler and more convenient, and effectively saving the replacement time; the arc-shaped protrusion a62 and the arc-shaped protrusion b63 are on the same horizontal plane.

[0025] like Figure 3 , Figure 8 and Fig.10 As shown, a rotation groove 44 is provided on the spring seat 4, a limiting groove 45 is provided on the inner side of the spring seat 4, and limiting holes 46 are provided at both ends of the limiting groove 45. A plurality of through holes a47 and through holes b48 are provided on the spring seat 4 for the support rod a41 and the support rod b42, respectively. The rotation groove 44 is used to install the rotating ring 6 so that the rotating ring 6 can be stably rotated and arranged in the spring seat 4; the sliders 64 provided at the upper and lower ends of the rotating ring 6 are slidably arranged in the limiting groove 45, which plays a limiting role on the rotating ring 6 to prevent the rotating ring 6 from deflecting and shaking during operation; the size of the limiting hole 46 matches the limiting blocks 65 provided at both ends of the slider 64, and the limiting blocks 65 can play a fixing role on the rotating ring 6 after being inserted into the limiting blocks 46; the through holes a47 and through holes b48 provided on the spring seat 4 are used to install the support rods a41 and b42, and the support rods a41 and b42 can slide up and down along the through holes a47 and through holes b48.

[0026] like Figure 3 and Fig. 9As shown, a plurality of threaded holes a49 are provided on the front of the spring seat 4, and a fastening bolt 410 is provided in the threaded hole a49. The threaded hole a49 matches the threaded hole b66 provided on the rotating ring 6 in size. When the rotating ring 6 completes the rotation and the limit block 65 is plugged into the limit hole 46, the threaded hole a49 and the threaded hole b66 are in opposite positions. The fastening bolt 410 can be threadedly connected with the threaded hole a49 and the threaded hole b66, further playing a limiting and fixing role for the rotating ring 6, and then when the arc clamping plate 43 clamps the piston rod 2, the arc clamping plate 43 can firmly clamp the piston rod 2 so that the spring seat 2 can be firmly connected with the piston rod 2 and move with the piston rod 2; the fastening bolt 410 is usually kept in the threaded hole a49, and when the rotating ring 6 needs to be fixed, the fastening bolt 410 can be screwed into the threaded hole b66, and when the rotating ring 6 needs to be rotated, the fastening bolt 410 can be screwed outward to exit the threaded hole b66.

[0027] like Figure 4 , Figure 5 , Figure 8 and Fig.10 As shown, sliders 64 are fixedly provided at the upper and lower ends of the rotating ring 6 corresponding to the limiting grooves 45, and limiting blocks 65 are fixedly provided at the two ends of the slider 64 corresponding to the limiting holes 46, and a threaded hole b66 is provided on the front side of the slider 64 corresponding to the threaded hole a49. The rotating ring 6 is rotatably provided in the spring seat 4, and the sliders 64 provided at the upper and lower ends of the rotating ring 6 cooperate with the limiting holes 46 provided at the two ends of the limiting grooves 45 inside the spring seat 4 to limit and fix the rotating ring 6, and fix the arc-shaped clamping plate 43 after the piston rod 2 is clamped, so that the spring seat 4 can be firmly and stably limited on the piston rod 2; when the buffer spring 5 is replaced, the spring seat 4 is firstly sleeved on the piston rod 2, and then the rotating ring 6 is rotated counterclockwise to contact the support rods a41 and b42 through the arc-shaped protrusions a62 and the arc-shaped protrusions b63, so as to drive the support rods a41 and b42 and the arc-shaped clamping plate 43 to descend, and the multiple arc-shaped clamping plates 43 are retracted inward to clamp the piston rod 2, and the slider 64 After rotating into place along the limiting groove 45, the limiting block 65 is inserted into the limiting hole 46. At this time, the fastening bolt 410 is screwed into the threaded hole b66 to complete the limiting fixation of the rotating ring 6; when the buffer spring 5 needs to be replaced, the spring seat 4 needs to be removed, and the fastening bolt 410 is first withdrawn from the threaded hole b66, and then the rotating ring 6 is rotated clockwise, so that the arc-shaped protrusion a62 and the arc-shaped protrusion b63 gradually release the squeezing of the support rod a41 and the support rod b42, so that the support rod a41 and the support rod b42 rise and reset under the drive of the return spring a411 and the return spring b412, so that the arc-shaped clamping plate 43 releases the clamping of the piston rod 2, and then the spring seat 4 is removed, and the buffer spring 5 can be removed from the cylinder body 1 for replacement.

[0028] like Figure 6 , Figure 8, Fig.10 As shown, a return spring a411 and a return spring b412 are respectively sleeved on the support rod a41 and the support rod b42, a spherical block a413 is fixedly provided on the top end of the support rod a41, and a spherical block b414 is fixedly provided on the top end of the support rod b42. When the arc-shaped protrusion a62 and the arc-shaped protrusion b63 release the squeezing of the support rod a41 and the support rod b42, the support rod a41 and the support rod b42 can rise and reset respectively driven by the return spring a411 and the return spring b412, thereby driving the arc-shaped clamping plate 43 to rise and release the clamping of the piston rod 2; by providing the spherical member a413, the guide rail 61 and the arc-shaped protrusion a62 can contact with the support rod a41 more smoothly without any obstruction; by providing the spherical member b414, the protrusion b63 can contact with the support rod b42 more smoothly, avoiding the obstruction that affects the movement of the support rod a41 and the support rod b42; the size of the front end of the rotating ring 6 is larger than the size of the rear end, so the height of the support rod b42 is lower than the support rod a41.

[0029] like Figure 1 and Figure 2 As shown, a rod head 21 is fixedly provided at the front end of the piston rod 2, an oil inlet 22 is provided at the front end of the piston rod 2, and a one-way valve 23, an oil return valve base 24, an oil return valve core 25, an oil return valve body 26, a piston body 27 and a piston end cover 28 are provided at the rear end of the piston rod 2 in sequence, and a force unloading spring 29 is provided between the oil return valve base 24 and the oil return valve core 25. When the oil inlet 22 is passed through the oil, the one-way valve 23 and the oil return valve core 25 are closed, and the hydraulic oil enters the rod cavity opened inside the piston rod 2 through the oil inlet 22, thereby pushing the piston to move rightward, and at the same time driving the piston rod 2 to compress the buffer spring 5; when the oil inlet 22 is not passed through the oil to release the pressure, the buffer spring 5 is reset to drive the piston rod 2 to move leftward, at this time the one-way valve 23 and the oil return valve core 25 are opened, and the hydraulic oil in the rod cavity enters the rodless cavity opened in the cylinder body 1 and then is discharged through the oil return port 13.

[0030] like Figure 1 As shown, a dust ring 31, an O-ring 32, a sealing ring 33, a step seal 34, a baffle 35 and a steel back bearing 36 are arranged between the piston rod 2 and the cylinder head 3. The dust ring 31 is provided to prevent dust and dirt, and the O-ring 32, the sealing ring 33 and the step seal 34 are provided to achieve a good sealing effect. The baffle 35 is made of polytetrafluoroethylene, which plays a buffering role for the sealing ring 33 when the sealing ring 33 is subjected to ultra-high pressure. The sealing ring 33 cooperates with the baffle 35 to achieve a good sealing effect.

[0031] like Figure 2 As shown, a Gly ring 11 and a support ring 12 are arranged between the piston rod 2 and the cylinder body 1 .

[0032] like Figure 1 As shown, an oil return port 13 is provided at the rear end of the cylinder body 1.

[0033] Embodiment 2

[0034] like Figure 6 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The difference between the second embodiment and the first embodiment is that an anti-skid pad 415 is provided at the bottom of the arc-shaped clamping plate 43. The anti-skid pad 415 can be made of a flexible material such as rubber or silicone. The anti-skid pad 415 can avoid unnecessary wear on the surface of the piston rod 2 when the arc-shaped clamping plate 43 clamps the piston rod 2, and can enhance the friction between the arc-shaped clamping plate 43 and the piston rod 2, so that the arc-shaped clamping plate 43 can clamp the piston rod 2 more firmly.

[0035] The working process is as follows.

[0036] When the buffer spring 5 needs to be replaced, the spring seat 4 needs to be removed, the fastening bolt 410 is first withdrawn from the threaded hole b66, and then the rotating ring 6 is rotated clockwise so that the arc-shaped protrusions a62 and the arc-shaped protrusions b63 gradually release the squeezing of the support rods a41 and b42, so that the support rods a41 and b42 rise and reset under the drive of the return springs a411 and b412, so that the arc-shaped clamping plate 43 releases the clamping of the piston rod 2, and then the spring seat 4 is removed, and then the buffer spring 5 can be removed from the cylinder body 1 for replacement; when the buffer spring 5 is replaced, the spring seat 4 is first sleeved on the piston rod 2, and then the rotating ring 6 is rotated counterclockwise to contact the support rods a41 and b42 through the arc-shaped protrusions a62 and the arc-shaped protrusions b63, driving the support rods a41 and b42 to move upward and downward. The rod b42 and the arc-shaped clamping plate 43 descend, and the multiple arc-shaped clamping plates 43 are retracted inward to clamp the piston rod 2. After the slider 64 rotates to the position along the limit groove 45, the limit block 65 is inserted into the limit hole 46. At this time, the fastening bolt 410 is screwed into the threaded hole b66 to complete the limit fixation of the rotating ring 6; when the oil inlet 22 is flowing with oil, the one-way valve 23 and the return oil valve core 25 are closed, and the hydraulic oil enters the rod chamber opened inside the piston rod 2 through the oil inlet 22, thereby pushing the piston to the right, and at the same time driving the piston rod 2 to compress the buffer spring 5; when the oil inlet 22 is not flowing with oil to release pressure, the buffer spring 5 is reset to drive the piston rod 2 to move to the left. At this time, the one-way valve 23 and the return oil valve core 25 are opened, and the hydraulic oil in the rod chamber enters the rodless chamber opened in the cylinder body 1 and is then discharged through the return oil port 13.

[0037] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front and back", "left and right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0038] Of course, in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0039] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A brake oil cylinder for facilitating spring replacement, comprising a cylinder body (1) and a piston rod (2) slidably arranged in the cylinder body (1), a cylinder cover (3) being arranged between the cylinder body (1) and the piston rod (2), characterized in that: A spring seat (4) is provided at the front end of the piston rod (2), a buffer spring (5) is provided between the spring seat (4) and the cylinder body (1), a rotating ring (6) is rotatably provided in the spring seat (4), a guide rail (61) is fixedly provided on the rotating ring (6), a plurality of arc-shaped protrusions a (62) are circumferentially provided on the guide rail (61), a plurality of arc-shaped protrusions b (63) are circumferentially provided on the rotating ring (6), a plurality of support rods a (41) and support rods b (42) are slidably provided on the spring seat (4), an arc-shaped clamping plate (43) is fixedly connected to the bottom of the support rods a (41) and support rods b (42), and when the rotating ring (6) rotates, the arc-shaped protrusions a (62) and the arc-shaped protrusions b (63) respectively contact the support rods a (41) and support rods b (42) to drive the arc-shaped clamping plate (43) to clamp the piston rod (2).

2. A brake oil cylinder for easy spring replacement according to claim 1, characterized in that: The spring seat (4) is provided with a rotation groove (44), the inner side of the spring seat (4) is provided with a limit groove (45), both ends of the limit groove (45) are provided with limit holes (46), and the spring seat (4) is provided with a plurality of through holes a (47) and through holes b (48) for the support rod a (41) and the support rod b (42), respectively.

3. A brake oil cylinder for easy replacement of springs according to claim 2, characterized in that: A plurality of threaded holes a (49) are provided on the front side of the spring seat (4), and fastening bolts (410) are arranged in the threaded holes a (49).

4. A brake oil cylinder for easy spring replacement according to claim 3, characterized in that: Slide blocks (64) are fixedly provided at the upper and lower ends of the rotating ring (6) corresponding to the limit grooves (45), limit blocks (65) are fixedly provided at the two ends of the slide block (64) corresponding to the limit holes (46), and a threaded hole b (66) is provided on the front side of the slide block (64) corresponding to the threaded hole a (49).

5. A brake oil cylinder for easy spring replacement according to claim 4, characterized in that: The support rod a (41) and the support rod b (42) are respectively sleeved with a return spring a (411) and a return spring b (412); a spherical block a (413) is fixedly provided at the top end of the support rod a (41), and a spherical block b (414) is fixedly provided at the top end of the support rod b (42).

6. A brake oil cylinder for easy spring replacement according to claim 5, characterized in that: An anti-slip pad (415) is provided at the bottom of the arc-shaped clamping plate (43).

7. A brake oil cylinder for easy spring replacement according to claim 6, characterized in that: A rod head (21) is fixedly provided at the front end of the piston rod (2), an oil inlet (22) is provided at the front end of the piston rod (2), a one-way valve (23), an oil return valve base (24), an oil return valve core (25), an oil return valve body (26), a piston body (27) and a piston end cover (28) are sequentially provided at the rear end of the piston rod (2), and a force unloading spring (29) is provided between the oil return valve base (24) and the oil return valve core (25).

8. A brake oil cylinder for easy spring replacement according to claim 7, characterized in that: A dust ring (31), an O-ring (32), a sealing ring (33), a step seal (34), a baffle (35) and a steel back bearing (36) are arranged between the piston rod (2) and the cylinder cover (3).

9. A brake oil cylinder for easy spring replacement according to claim 8, characterized in that: A Gly ring (11) and a support ring (12) are provided between the piston rod (2) and the cylinder body (1).

10. A brake oil cylinder for easy spring replacement according to claim 9, characterized in that: An oil return port (13) is provided at the rear end of the cylinder body (1).

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