Hydraulic oil cylinder and freight carriage jacking device

Abstract

The invention discloses a hydraulic oil cylinder and a freight carriage jacking device, and relates to the technical field of hydraulic oil cylinders, the hydraulic oil cylinder comprises an oil cylinder body, an oil cylinder cover is fixedly mounted at the upper end of the oil cylinder body, a piston ejector rod is arranged in the oil cylinder body, a piston body is arranged on the circumferential surface of the piston ejector rod, and a baffle ring is fixedly mounted on the inner wall of the oil cylinder body. According to the safety oil cylinder, the two safety supporting rods are arranged, the oil cylinder body and the piston ejector rod can be additionally supported, when a truck carries out goods loading and unloading and other operations, if a hydraulic oil cylinder breaks down, the hydraulic oil cylinder can be prevented from breaking down, and the safety oil cylinder can be prevented from breaking down. If the conditions such as sudden damage of a sealing piece and breakage of an oil pipe occur, the safety supporting rod can play a role immediately, the container is prevented from falling accidentally, and serious injury to operators and damage to goods and vehicles are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, and in particular to a hydraulic cylinder and a freight carriage jacking device. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] The current hydraulic cylinders are found to have at least the following technical problems:

[0004] First, the original hydraulic cylinder lacks an effective additional support mechanism. If a hydraulic cylinder failure occurs during truck loading and unloading operations, it is easy to cause the cargo box to drop unexpectedly, causing personal injury and damage to cargo and vehicles.

[0005] Second, the hydraulic cylinders used to lift truck compartments in the past were unable to share the weight when stationary, causing the hydraulic cylinders to be under greater pressure and shortening their service life.

[0006] Third, the hydraulic cylinders in the past lacked stability after the cargo box was lifted, and were easily affected by factors such as wind resistance and vehicle sway, increasing the risk of the cargo box overturning.

[0007] Fourth, in the past, when the piston push rod of the hydraulic cylinder was recovered, it was impossible to effectively clean the dust particles on its surface, which easily led to damage to the sealing ring and inconvenient replacement of the cleaning parts. Summary of the invention

[0008] 1. Technical issues to be resolved

[0009] In view of the deficiencies in the prior art, the present invention provides a hydraulic cylinder and a freight carriage jacking device to solve the above-mentioned technical problems.

[0010] (II) Technical solution

[0011] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0012] A hydraulic cylinder comprises a cylinder body, a cylinder cover is fixedly installed on the upper end of the cylinder body, a piston push rod is arranged in the cylinder body, a piston body is arranged on the circumferential surface of the piston push rod, a retaining ring is fixedly installed on the inner wall of the cylinder body, a fixing ring is fixedly installed on the upper end of the cylinder cover, a half ring block is connected with the intersection of the fixing ring and the piston push rod by magnetic attraction, cylinder body earrings are fixedly installed on the separated ends of the cylinder body and the piston push rod, two sets of supporting mechanisms are arranged between the cylinder body and the piston push rod, and the supporting mechanism includes a reinforcing A base and a reinforced top plate, a baffle is fixedly installed on the upper end of the reinforced base, a pressure plate is fixedly installed on the baffle, a roller is rotatably arranged on the pressure plate, a rotating shaft is rotatably installed in the reinforced top plate, a safety support rod is fixedly installed on the circumferential surface of the rotating shaft, a spring is provided inside the reinforced top plate, and the spring is fixedly installed on the upper end of the safety support rod, a U-shaped fixing plate is fixedly installed on the side end of the reinforced base in the two groups of support mechanisms, a connecting plate is provided on the side end of the U-shaped fixing plate, and two extrusion blocks are fixedly installed on the upper end of the connecting plate.

[0013] Preferably: two safety support rods are respectively slidably installed between the two extrusion blocks and the reinforced base, a groove is provided at the lower end of the safety support rod, the pressure plate and the roller are both located in the groove provided in the safety support rod, the circumferential surfaces of the cylinder body and the cylinder cover are penetrated by pipe joints, the upper end of the piston push rod is slidably installed on the cylinder cover, and a push block is fixedly installed on the upper end of the piston push rod.

[0014] Preferably: the two reinforced bases are fixedly mounted on the circumferential surface of the lower end of the cylinder body, the two reinforced top plates are respectively fixedly mounted on both sides of the top block, a T-shaped fixing rod is fixedly mounted on the side end of the U-shaped fixing plate, the connecting plate is slidably mounted on the outer surface of the T-shaped fixing rod, a tension spring is installed between the connecting plate and the U-shaped fixing plate, and the tension spring is sleeved on the outer surface of the T-shaped fixing rod.

[0015] A freight car jacking device comprises two mounting frames, which are respectively mounted on two cylinder earrings, and the two mounting frames are both U-shaped. High-strength bolts penetrate and connect the two mounting frames and the cylinder earrings, and mounting plates are fixedly mounted on the separated ends of the two mounting frames, and the lower end of the mounting plate located below is connected to an extension plate by bolts.

[0016] (III) Beneficial effects

[0017] 1. The present invention provides two safety support bars to provide additional support to the cylinder body and the piston push rod, so that when the truck is performing operations such as loading and unloading cargo, if the hydraulic cylinder fails, such as sudden damage to the seal, rupture of the oil pipe, etc., the safety support bar can immediately play a role to prevent the cargo box from accidentally falling, avoiding serious injury to the operator and damage to the cargo and the vehicle.

[0018] Second: The present invention provides two safety support bars, so that when the cargo box is lifted to a certain height, the two safety support bars can provide additional support points for the entire system, thereby increasing stability and reducing the risk of overturning of the cargo box due to factors such as wind resistance and vehicle shaking.

[0019] 3. The present invention provides two safety support bars on the cylinder body and the piston push rod, so that the safety support bars can share part of the weight when the truck compartment is stationary, reduce the pressure on the hydraulic cylinder, and thus extend the service life of the cylinder. In particular, for truck hydraulic cylinders that are in a high-load working state for a long time, the service life of the hydraulic cylinder is effectively improved.

[0020] Fourth: The present invention provides connecting plates, extrusion blocks, springs, rotating shafts and other structures, so that when the hydraulic cylinder is not in use, the truck compartment can automatically retract the two safety support rods, and then overlap the cylinder body and the piston push rod to complete the folding of the hydraulic cylinder without the need for separate operation by the staff, which is very convenient.

[0021] 5. The present invention provides a wiping cloth on the inner surface of the half-ring block, and the half-ring block is connected to the fixed ring by magnetic attraction. When the hydraulic cylinder contracts, the circumferential surface of the piston push rod will contact the wiping cloth on the half-ring block, so that the wiping cloth on the half-ring block can clean some dust particles on the piston push rod, avoiding the dust particles from contacting the sealing ring when the piston push rod is recovered, thereby causing damage to the sealing ring. In addition, the magnetic attraction design between the half-ring block and the fixed ring can facilitate the replacement of the wiping cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0023] Figure 1 This is the initial state diagram of the hydraulic cylinder of the present invention;

[0024] Figure 2 This is a diagram showing the jacking state of the hydraulic cylinder of the present invention;

[0025] Figure 3 This is a diagram of the hydraulic cylinder stowing process of the present invention;

[0026] Figure 4 It is a structural diagram of the oil cylinder body of the present invention;

[0027] Figure 5 This is a structural diagram of the reinforced base of the present invention;

[0028] Figure 6 It is a structural diagram of the piston push rod of the present invention;

[0029] Figure 7 It is a structural diagram of the safety support rod of the present invention;

[0030] Figure 8 For the present invention Figure 6 A magnified view of the structure at A;

[0031] Fig. 9 For the present invention Figure 7 Enlarged view of the structure at B.

[0032] Legend: 11. Cylinder body; 12. Reinforced base; 13. Baffle; 14. U-shaped fixing plate; 15. Pipe joint; 16. Baffle ring; 17. Piston push rod; 18. Piston body; 19. Cylinder head; 21. Connecting plate; 22. Tension spring; 23. Extrusion block; 24. T-shaped fixing rod; 31. Mounting frame; 32. Extension plate; 33. Mounting plate; 34. High-strength bolt; 35. Cylinder body earring; 36. Push block; 41. Fixing ring; 42. Half ring block; 43. Reinforced top plate; 44. Safety support rod; 45. Rotating shaft; 46. Spring; 51. Pressure plate; 52. Roller; 53. Slot. DETAILED DESCRIPTION

[0033] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0034] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9As shown, in view of the problems existing in the prior art, the present invention provides a hydraulic cylinder, including a cylinder body 11, a cylinder cover 19 is fixedly installed on the upper end of the cylinder body 11, a piston push rod 17 is arranged in the cylinder body 11, a piston body 18 is arranged on the circumferential surface of the piston push rod 17, a retaining ring 16 is fixedly installed on the inner wall of the cylinder body 11, a fixing ring 41 is fixedly installed on the upper end of the cylinder cover 19, a half ring block 42 is connected to the intersection of the fixing ring 41 and the piston push rod 17 by magnetic attraction, cylinder body earrings 35 are fixedly installed on the separated ends of the cylinder body 11 and the piston push rod 17, two groups of supporting mechanisms are arranged between the cylinder body 11 and the piston push rod 17, and the supporting mechanism is provided on the inner wall of the cylinder body 11. The support mechanism includes a reinforced base 12 and a reinforced top plate 43. A baffle 13 is fixedly installed on the upper end of the reinforced base 12. A pressure plate 51 is fixedly installed on the baffle 13. A roller 52 is rotatably arranged on the pressure plate 51. A rotating shaft 45 is rotatably installed in the reinforced top plate 43. A safety support rod 44 is fixedly installed on the circumferential surface of the rotating shaft 45. A spring 46 is arranged inside the reinforced top plate 43. The spring 46 is fixedly installed on the upper end of the safety support rod 44. A U-shaped fixing plate 14 is fixedly installed on the side end of the reinforced base 12 in the two groups of support mechanisms. A connecting plate 21 is arranged on the side end of the U-shaped fixing plate 14. Two extrusion blocks 23 are fixedly installed on the upper end of the connecting plate 21. Figure 1 As shown, when the hydraulic cylinder is lifting the truck compartment, the hydraulic oil cylinder is connected to the pipe joints 15 on the cylinder body 11 and the cylinder head 19 respectively through the hydraulic oil supply system (the prior art), and then the oil is supplied through the pipe joint 15 on the cylinder body 11, so as to generate an extrusion force on the piston body 18 inside the cylinder body 11, so that it moves upward. At this time, the piston push rod 17 fixedly connected to the piston body 18 moves upward, driving the top block 36 and two reinforcing top plates 43 and the mounting frame 31 at the upper end of the piston push rod 17 to move upward. When the device is in use, the mounting plate 33 at the upper end is connected to the bottom of the truck compartment by bolts, and the mounting plate 33 and the extension plate 32 at the lower end are connected by bolts. It is connected to the truck frame, so when the mounting plate 33 at the upper end moves up, it will drive the truck compartment to move up, thereby completing the jacking work of the truck compartment, and the installation method of the hydraulic oil pump and the rotatability between the mounting frame 31 and the cylinder body earring 35 make the hydraulic oil pump suitable for jacking work of the side-rolling truck compartment. The present invention provides two safety support rods 44 on the cylinder body 11 and the piston push rod 17, so that the safety support rod 44 can share part of the weight when the truck compartment is stationary, reduce the pressure on the hydraulic cylinder, thereby extending the service life of the cylinder, especially for the truck hydraulic cylinder that is in a high-load working state for a long time, effectively improving the service life of the hydraulic cylinder.

[0035] The two safety support rods 44 are respectively slidably installed between the two extrusion blocks 23 and the reinforced base 12, and a groove 53 is provided at the lower end of the safety support rod 44. The pressure plate 51 and the roller 52 are both located in the groove 53 provided on the safety support rod 44. The circumferential surfaces of the cylinder body 11 and the cylinder cover 19 are penetrated by a pipe joint 15, and the upper end of the piston push rod 17 is penetrated and slidably installed on the cylinder cover 19, and the upper end of the piston push rod 17 is fixedly installed with a top block 36. When the hydraulic cylinder is lifted, the cylinder body earring 35 drives the two reinforced top plates 43 to move up. At this time, the two reinforced top plates 43 drive the two safety support rods 44 to move upward, and the lower ends of the two safety support rods 44 will slowly move up from between the extrusion block 23 and the reinforced base 12. When the lower end of the safety support rod 44 moves up to be flush with the reinforced base 12, the piston push rod 17 in the cylinder body 11 completes the lifting stroke. Figure 2 As shown in, at this time, under the tension of the tension spring 22, and the side end of the tension spring 22 is fixedly connected to the U-shaped fixing plate 14, the connecting plate 21 will drive the two extrusion blocks 23 to squeeze the safety support rod 44, so that the safety support rod 44 can be squeezed into the upper end of the reinforced base 12 and fit with the baffle 13. At this time, the piston push rod 17 is controlled to move slightly downward through the pressure oil supply system, so that the bottom of the safety support rod 44 can be tightly fitted with the reinforced base 12. At the same time, the extrusion block 23 can squeeze the safety support rod 44, thereby completing the fixing of the safety support rod 44. At this time, the safety support rod 44 provides a certain support between the piston push rod 17 and the cylinder body 11. Function: The two safety support rods 44 provided in the present invention can provide additional support to the cylinder body 11 and the piston push rod 17, so that when the truck is performing operations such as loading and unloading cargo, if the hydraulic cylinder fails, such as sudden damage to the seal, rupture of the oil pipe, etc., the safety support rod 44 can immediately play a role to prevent the cargo box from accidentally falling, thereby avoiding serious injury to the operator and damage to the cargo and the vehicle. The two safety support rods 44 provided in the present invention can provide additional support points for the entire system when the cargo box is lifted to a certain height, thereby increasing stability and reducing the risk of the cargo box overturning due to factors such as wind resistance and vehicle shaking.

[0036] The two reinforcing bases 12 are fixedly mounted on the circumferential surface of the lower end of the cylinder body 11, the two reinforcing top plates 43 are respectively fixedly mounted on both sides of the top block 36, the side ends of the U-shaped fixing plate 14 are fixedly mounted with a T-shaped fixing rod 24, the connecting plate 21 is slidably mounted on the outer surface of the T-shaped fixing rod 24, and a tension spring 22 is installed between the connecting plate 21 and the U-shaped fixing plate 14, and the tension spring 22 is sleeved on the outer surface of the T-shaped fixing rod 24, such as Figure 3As shown, after the unloading of the truck compartment is completed, the piston push rod 17 is controlled by the hydraulic oil supply system to continue to move upward, and automatically stops when the piston body 18 moves to the position of the retaining ring 16. At this time, the safety support rod 44 is separated from the extrusion block 23, and under the elastic force of the spring 46, the safety support rod 44 can be rotated through the center point of the rotating shaft 45, so that the bottom of the safety support rod 44 can be moved to the upper end of the extrusion block 23. At this time, the pipe joint 15 on the cylinder head 19 is supplied with oil through the hydraulic oil supply system. , control the piston push rod 17 and the piston body 18 to move downward. Since the safety support rod 44 is in an inclined state, and the force applied downward by the upper end of the safety support rod 44 is in a vertical direction, the safety support rod 44 will squeeze the extrusion block 23. Through the design of the inclined surface at the upper end of the extrusion block 23, the extrusion block 23 can be moved to the right, and the pressure plate 51 and the roller 52 will contact the side of the safety support rod 44, thereby preventing the safety support rod 44 from moving to the left. When the safety support rod 44 is completely moved downward, it will return to the position as shown in the figure. Figure 1 In the state of being between the extrusion block 23 and the reinforced base 12, the present invention arranges the connecting plate 21 and the extrusion block 23 as well as the spring 46 and the rotating shaft 45 and other structures, so that when the hydraulic cylinder is not in use, the truck compartment can automatically retract the two safety support rods 44, and then overlap the cylinder body 11 and the piston push rod 17, thereby completing the retraction of the hydraulic cylinder, without the need for staff to operate separately, which is very convenient.

[0037] A freight car jacking device comprises two mounting frames 31, which are respectively mounted on two cylinder earrings 35. Both mounting frames 31 are U-shaped, and high-strength bolts 34 are penetrated and connected between the two mounting frames 31 and the cylinder earrings 35. Mounting plates 33 are fixedly mounted on the separated ends of the two mounting frames 31, and the lower end of the mounting plate 33 located below is connected to an extension plate 32 by bolts. Since a wiping cloth is provided on the inner surface of a semi-ring block 42, and the semi-ring block 42 is connected to a fixing ring 41 by magnetic attraction, when the hydraulic cylinder contracts, the circumferential surface of the piston push rod 17 will contact the wiping cloth on the semi-ring block 42, so that the wiping cloth on the semi-ring block 42 can clean some particle dust on the piston push rod 17, so as to avoid the particle dust from contacting the sealing ring when the piston push rod 17 is recovered, thereby damaging the sealing ring. In addition, the magnetic attraction design between the semi-ring block 42 and the fixing ring 41 can facilitate the replacement of the wiping cloth.

[0038] Working principle:

[0039] The first step, such as Figure 1As shown, when the hydraulic cylinder is lifting the truck compartment, the hydraulic oil cylinder is connected to the pipe joints 15 on the cylinder body 11 and the cylinder head 19 respectively through the hydraulic oil supply system (the prior art), and then the oil is supplied through the pipe joint 15 on the cylinder body 11, so as to generate an extrusion force on the piston body 18 inside the cylinder body 11, so that it moves upward. At this time, the piston push rod 17 fixedly connected to the piston body 18 moves upward, driving the top block 36 and two reinforcing top plates 43 and the mounting frame 31 at the upper end of the piston push rod 17 to move upward. When the device is in use, the mounting plate 33 at the upper end is connected to the bottom of the truck compartment by bolts, and the mounting plate 33 and the extension plate 32 at the lower end are connected by bolts. It is connected to the truck frame, so when the mounting plate 33 at the upper end moves up, it will drive the truck compartment to move up, thereby completing the jacking work of the truck compartment, and the installation method of the hydraulic oil pump and the rotatability between the mounting frame 31 and the cylinder body earring 35 make the hydraulic oil pump suitable for jacking work of the side-rolling truck compartment. The present invention provides two safety support rods 44 on the cylinder body 11 and the piston push rod 17, so that the safety support rod 44 can share part of the weight when the truck compartment is stationary, reduce the pressure on the hydraulic cylinder, thereby extending the service life of the cylinder, especially for the truck hydraulic cylinder that is in a high-load working state for a long time, effectively improving the service life of the hydraulic cylinder.

[0040] In the second step, while the hydraulic cylinder is jacking up, the cylinder earring 35 drives the two reinforcing top plates 43 to move up. At this time, the two reinforcing top plates 43 drive the two safety support rods 44 to move upward, and the lower ends of the two safety support rods 44 will slowly move up from between the extrusion block 23 and the reinforcing base 12. When the lower ends of the safety support rods 44 move up to the same position as the reinforcing base 12, the piston push rod 17 in the cylinder body 11 completes the jacking stroke. Figure 2As shown in, at this time, under the tension of the tension spring 22, and the side end of the tension spring 22 is fixedly connected to the U-shaped fixing plate 14, the connecting plate 21 will drive the two extrusion blocks 23 to squeeze the safety support rod 44, so that the safety support rod 44 can be squeezed into the upper end of the reinforced base 12 and fit with the baffle 13. At this time, the piston push rod 17 is controlled to move slightly downward through the pressure oil supply system, so that the bottom of the safety support rod 44 can be tightly fitted with the reinforced base 12. At the same time, the extrusion block 23 can squeeze the safety support rod 44, thereby completing the fixing of the safety support rod 44. At this time, the safety support rod 44 provides a certain support between the piston push rod 17 and the cylinder body 11. Function: The two safety support rods 44 provided in the present invention can provide additional support to the cylinder body 11 and the piston push rod 17, so that when the truck is performing operations such as loading and unloading cargo, if the hydraulic cylinder fails, such as sudden damage to the seal, rupture of the oil pipe, etc., the safety support rod 44 can immediately play a role to prevent the cargo box from accidentally falling, thereby avoiding serious injury to the operator and damage to the cargo and the vehicle. The two safety support rods 44 provided in the present invention can provide additional support points for the entire system when the cargo box is lifted to a certain height, thereby increasing stability and reducing the risk of the cargo box overturning due to factors such as wind resistance and vehicle shaking.

[0041] The third step is Figure 3 As shown, after the unloading of the truck compartment is completed, the piston push rod 17 is controlled by the hydraulic oil supply system to continue to move upward, and automatically stops when the piston body 18 moves to the position of the retaining ring 16. At this time, the safety support rod 44 is separated from the extrusion block 23, and under the elastic force of the spring 46, the safety support rod 44 can be rotated through the center point of the rotating shaft 45, so that the bottom of the safety support rod 44 can be moved to the upper end of the extrusion block 23. At this time, the pipe joint 15 on the cylinder head 19 is supplied with oil through the hydraulic oil supply system. , control the piston push rod 17 and the piston body 18 to move downward. Since the safety support rod 44 is in an inclined state, and the force applied downward by the upper end of the safety support rod 44 is in a vertical direction, the safety support rod 44 will squeeze the extrusion block 23. Through the design of the inclined surface at the upper end of the extrusion block 23, the extrusion block 23 can be moved to the right, and the pressure plate 51 and the roller 52 will contact the side of the safety support rod 44, thereby preventing the safety support rod 44 from moving to the left. When the safety support rod 44 is completely moved downward, it will return to the position as shown in the figure. Figure 1 In the state of being between the extrusion block 23 and the reinforced base 12, the present invention arranges the connecting plate 21 and the extrusion block 23 as well as the spring 46 and the rotating shaft 45 and other structures, so that when the hydraulic cylinder is not in use, the truck compartment can automatically retract the two safety support rods 44, and then overlap the cylinder body 11 and the piston push rod 17, thereby completing the retraction of the hydraulic cylinder, without the need for staff to operate separately, which is very convenient.

[0042] In the fourth step, since a wiping cloth is provided on the inner surface of the semi-ring block 42 and the semi-ring block 42 is connected to the fixing ring 41 by magnetic attraction, when the hydraulic cylinder contracts, the circumferential surface of the piston push rod 17 will contact the wiping cloth on the semi-ring block 42, so that the wiping cloth on the semi-ring block 42 can clean some dust particles on the piston push rod 17, avoiding the dust particles from contacting the sealing ring when the piston push rod 17 is recovered, thereby causing damage to the sealing ring. In addition, the magnetic attraction design between the semi-ring block 42 and the fixing ring 41 makes it very convenient to replace the wiping cloth.

[0043] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A hydraulic cylinder, comprising a cylinder body (11), characterized in that: The upper end of the oil cylinder body (11) is fixedly mounted with an oil cylinder cover (19); a piston push rod (17) is arranged inside the oil cylinder body (11); a piston body (18) is arranged on the circumferential surface of the piston push rod (17); a retaining ring (16) is fixedly mounted on the inner wall of the oil cylinder body (11); a fixing ring (41) is fixedly mounted on the upper end of the oil cylinder cover (19); a half ring block (42) is connected to the intersection of the fixing ring (41) and the piston push rod (17) by magnetic attraction; and cylinder body earrings (35) are fixedly mounted on the separated ends of the oil cylinder body (11) and the piston push rod (17); Two groups of supporting mechanisms are arranged between the oil cylinder body (11) and the piston push rod (17), and the supporting mechanism comprises a reinforcing base (12) and a reinforcing top plate (43); a baffle (13) is fixedly mounted on the upper end of the reinforcing base (12); a pressure plate (51) is fixedly mounted on the baffle (13); a roller (52) is rotatably arranged on the pressure plate (51); a rotating shaft (45) is rotatably mounted inside the reinforcing top plate (43); a safety support rod (44) is fixedly mounted on the circumferential surface of the rotating shaft (45); a spring (46) is arranged inside the reinforcing top plate (43); and the spring (46) is fixedly mounted on the upper end of the safety support rod (44); A U-shaped fixing plate (14) is fixedly mounted on the side ends of the reinforcing bases (12) in the two groups of supporting mechanisms, a connecting plate (21) is provided on the side ends of the U-shaped fixing plate (14), and two extrusion blocks (23) are fixedly mounted on the upper ends of the connecting plates (21).

2. A hydraulic cylinder according to claim 1, characterized in that: The two safety support rods (44) are respectively slidably mounted between the two extrusion blocks (23) and the reinforcement base (12).

3. A hydraulic cylinder according to claim 2, characterized in that: A clamping groove (53) is formed at the lower end of the safety support rod (44).

4. A hydraulic cylinder according to claim 3, characterized in that: The pressing plate (51) and the roller (52) are both located in a slot (53) formed on the safety support rod (44).

5. A hydraulic cylinder according to claim 4, characterized in that: The circumferential surfaces of the oil cylinder body (11) and the oil cylinder cover (19) are both penetrated by a pipe joint (15).

6. A hydraulic cylinder according to claim 5, characterized in that: The upper end of the piston push rod (17) is penetrated and slidably mounted on the oil cylinder cover (19); Wherein, a top block (36) is fixedly mounted on the upper end of the piston top rod (17).

7. A hydraulic cylinder according to claim 6, characterized in that: The two reinforcing bases (12) are both fixedly mounted on the circumferential surface of the lower end of the oil cylinder body (11); Wherein, the two reinforced top plates (43) are respectively fixedly mounted on both sides of the top block (36).

8. A hydraulic cylinder according to claim 7, characterized in that: A T-shaped fixing rod (24) is fixedly mounted on the side end of the U-shaped fixing plate (14); The connecting plate (21) is slidably mounted on the outer surface of the T-shaped fixing rod (24).

9. A hydraulic cylinder according to claim 8, characterized in that: A tension spring (22) is installed between the connecting plate (21) and the U-shaped fixing plate (14); Wherein, the tension spring (22) is sleeved on the outer surface of the T-shaped fixing rod (24).

10. A freight carriage jacking device, comprising two mounting frames (31), wherein the two mounting frames (31) are respectively mounted on the two cylinder earrings (35) in claim 1, characterized in that: The two mounting frames (31) are both U-shaped, and high-strength bolts (34) penetrate and connect the two mounting frames (31) and the cylinder body earrings (35); Wherein, the separated ends of the two mounting frames (31) are both fixedly mounted with mounting plates (33), and the lower end of the mounting plate (33) located at the bottom is connected to an extension plate (32) via bolts.

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