Oil cylinder and shear fork type lifting platform using same

Abstract

The utility model provides an oil cylinder and a scissors fork type lifting platform using the oil cylinder, the oil cylinder comprises a cylinder barrel, an oil inlet and outlet pipe and a boosting rod, the oil inlet and outlet pipe is arranged at the bottom of the cylinder barrel and communicated with an inner cavity of the cylinder barrel, the oil cylinder further comprises a spring and a hollow plunger rod, and the hollow plunger rod is sleeved inside the cylinder barrel; a through hole is formed in the end, close to the bottom of the cylinder barrel, of the hollow plunger rod, a part of the boosting rod penetrates through the through hole to be arranged in the hollow plunger rod, the spring is arranged in the hollow plunger rod, one end of the spring abuts against the hollow plunger rod, and the other end of the spring abuts against the boosting rod. A spring and a boosting rod are arranged in a hollow plunger rod, a part of initial thrust is provided at the starting moment of a lifting platform, the burden of a hydraulic system is relieved, oil pressure needed during starting is reduced, energy consumption is saved, and the service life of the hydraulic system is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lifting mechanism especially to a scissors type lifting platform with an oil cylinder and using the oil cylinder. BACKGROUND

[0002] The structural features of the scissors type lifting platform determine that the scissors type lifting platform is in the most compact state when being at the lowest position, and a large initial thrust is needed when unfolding the scissors mechanism and lifting the platform, in order to overcome the initial mechanical resistance of the scissors mechanism, the hydraulic system must provide sufficient oil pressure to make the lifting platform smoothly rise, and with the rising of the lifting platform, the scissors mechanism gradually unfolds, and the required thrust will gradually decrease, using the hydraulic system with larger oil pressure will not only increase energy consumption, but also cause resource waste.

[0003] Therefore, a scissors type lifting platform with an auxiliary oil cylinder is needed to ensure that the lifting platform can normally rise under limited pressure. SUMMARY

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims to design an oil cylinder and a scissors type lifting platform using the oil cylinder, which can provide part of the initial thrust at the moment of starting the lifting platform, reduce the burden of the hydraulic system, reduce the required oil pressure at the time of starting, save energy consumption, and prolong the service life of the hydraulic system.

[0005] To achieve the above-mentioned purpose, the utility model provides an oil cylinder, which comprises a cylinder barrel, an inlet and outlet oil pipe and a boost rod, the inlet and outlet oil pipe is arranged at the bottom of the cylinder barrel and communicates with the inner cavity of the cylinder barrel, further comprising a spring and a hollow plunger rod, the hollow plunger rod is sleeved in the inside of the cylinder barrel, one end of the hollow plunger rod close to the bottom of the cylinder barrel is provided with a through hole, a part of the boost rod passes through the through hole and is arranged in the inside of the hollow plunger rod, the spring is arranged in the inside of the hollow plunger rod, one end of the spring abuts against the hollow plunger rod, and the other end abuts against the boost rod.

[0006] Further, the boost rod is provided with a first column body and a second column body with a smaller cross-sectional area than the first column body, the cross-sectional area of the first column body is larger than that of the through hole, and the cross-sectional area of the second column body is smaller than that of the through hole.

[0007] Further, the cylinder barrel is sequentially provided with an expansion port and an oil cavity from top to bottom, and the cross-sectional area of the expansion port is smaller than that of the oil cavity.

[0008] Further, the inside surface of the expansion port is provided with a plurality of oil seals arranged at an upper and lower interval.

[0009] Further, the outside surface and the inside surface of the piston are both embedded with a plurality of oil seals arranged at an upper and lower interval.

[0010] Further, the inner side surface of the telescopic port is further provided with a wear-resistant ring.

[0011] Further, the upper end of the hollow plunger rod is provided with a first connecting piece, and the lower end of the cylinder is provided with a second connecting piece.

[0012] Further, one end of the oil inlet and outlet pipe is provided with a first port opened on the inner side bottom surface of the cylinder, and the other end is provided with a second port connected with the oil pump.

[0013] Further, a scissor lift table comprises a table top, a bottom plate, a first supporting rod and a second supporting rod, the table top is arranged above the bottom plate, the middle part of the first supporting rod is hinged with the middle part of the second supporting rod, the upper ends of the first supporting rod and the second supporting rod are respectively hinged with the left and right ends of the table top, the lower ends of the first supporting rod and the second supporting rod are respectively hinged with the left and right ends of the bottom plate, and the oil cylinder is arranged, one end of the oil cylinder is hinged with the upper half of the first supporting rod, and the other end of the oil cylinder is hinged with the lower half of the second supporting rod.

[0014] Further, the first traction piece is fixed between the upper end of the first supporting rod and the middle part of the first supporting rod, the second traction piece is fixed between the lower end of the second supporting rod and the middle part of the second supporting rod, the first connecting piece is hinged with the first traction piece, and the second connecting piece is hinged with the second traction piece.

[0015] After the above technical scheme is adopted, the beneficial effects of the oil cylinder and the scissor lift table using the oil cylinder are as follows: the oil cylinder and the scissor lift table using the oil cylinder can provide a part of initial thrust in the starting moment through the spring and the boost rod arranged in the hollow plunger rod when the lift table is lifted, the burden of the hydraulic system is reduced, the oil pressure required in the starting moment is reduced, the energy consumption can be saved, the pressure requirement of the hydraulic pump and other hydraulic elements is reduced, and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 The state diagram of the first stage of the oil cylinder related to the embodiments of the utility model is shown;

[0017] Fig. 2 The state diagram of the second stage of the oil cylinder related to the embodiments of the utility model is shown;

[0018] Fig. 3 The state diagram of the third stage of the oil cylinder related to the embodiments of the utility model is shown;

[0019] Fig. 4 The state diagram of the first stage of the scissor lift table related to the embodiments of the utility model is shown;

[0020] Fig. 5 Figure 2 is a state diagram of a second stage of the scissor lift platform according to an embodiment of the present application;

[0021] Fig. 6 Figure 3 is a state diagram of a third stage of the scissor lift platform according to an embodiment of the present application.

[0022] The reference signs are: 1, scissor lift platform; 11, platform; 12, bottom plate; 13, first support rod; 14, second support rod; 15, first traction member; 16, second traction member;

[0023] 2, oil cylinder; 21, inlet and outlet oil pipe; 22, cylinder barrel; 221, telescopic port; 222, oil cavity; 223, oil seal; 224, wear ring; 23, boost rod; 231, first column body; 232, second column body; 24, spring; 25, hollow plunger rod; 26, first connecting member; 27, first traction member;

[0024] 3, hydraulic oil. DETAILED DESCRIPTION

[0025] The technical scheme of the present application will be further described below through embodiments:

[0026] The present application provides an oil cylinder and a scissor lift platform using the same, as shown in the drawings, Figs. 1-3 An oil cylinder 2 comprises a cylinder barrel 22, an inlet and outlet oil pipe 21, a boost rod 23, a spring 24 and a hollow plunger rod 25. The inlet and outlet oil pipe 21 is arranged at the bottom of the cylinder barrel 22 and communicates with the inner cavity of the cylinder barrel 22. The hollow plunger rod 25 is sleeved in the inside of the cylinder barrel 22. The lower end of the hollow plunger rod 25 is provided with a through hole, the boost rod 23 passes through the through hole, the spring 24 is arranged in the inside of the hollow plunger rod 25, one end of the spring 24 abuts against the hollow plunger rod 25, and the other end of the spring 24 abuts against the boost rod 23.

[0027] Specifically, the boost rod 23 is provided with a first column body 231 and a second column body 232 with a smaller cross-sectional area than the first column body 231. The cross-sectional area of the first column body 231 is larger than the cross-sectional area of the inlet and outlet of the boost rod 23, and the cross-sectional area of the second column body 232 is smaller than the cross-sectional area of the inlet and outlet of the boost rod 23.

[0028] Specifically, the cylinder barrel 22 is sequentially provided with a telescopic port 221 and an oil cavity 222 from top to bottom. The cross-sectional area of the telescopic port 221 is smaller than the cross-sectional area of the oil cavity 222.

[0029] Specifically, the inner side surface of the telescopic port 221 is provided with a plurality of oil seals 223 arranged at intervals in the up-down direction. The oil seals 223 contact the outer side surface of the hollow plunger rod 25, so that the cylinder barrel 22 becomes a sealed cavity, preventing the hydraulic oil 3 from overflowing and air from entering.

[0030] Specifically, the inner surface of the telescopic port 221 is also provided with a wear-resistant ring 224, which contacts the outer surface of the hollow plunger rod 25 so that the hollow plunger rod 25 can slide along the axial direction of the cylinder 22 in the channel of the cylinder 22, thereby reducing the influence of resistance on the hollow plunger rod 25.

[0031] Preferably, in this embodiment, the inlet and outlet oil pipe 21 passes through the bottom of the cylinder 22. One end of the inlet and outlet oil pipe 21 is provided with a first port located on the bottom surface of the inner side of the cylinder 22, and the other end is provided with a second port connected to the oil pump. In other embodiments, the first port can also be provided at other positions inside the cylinder 22, as long as the inlet and outlet oil pipe 21 can connect the inner cavity of the cylinder 22 with the external oil pump.

[0032] Specifically, the upper end of the hollow plunger rod 25 is provided with a first connector 26, and the lower end of the cylinder 22 is provided with a second connector 27, for connecting with the scissor lift platform 1.

[0033] Preferably, in this embodiment, the first connector 26 and the second connector 27 are in the shape of an annulus. However, in other embodiments, the first connector 26 and the second connector 27 may be in other shapes, as long as they can achieve the effect of rotating connection with the scissor lift platform 1.

[0034] In practical applications, in the first stage, the oil pump draws out the hydraulic oil 3. At this time, the cylinder 22 is under negative pressure. At this time, the push rod 23 and the hollow plunger rod 25 are both located at the bottom of the cylinder 22, and the spring 24 is kept in a compressed state due to the negative pressure.

[0035] Second stage: The oil pump starts pumping oil into the cylinder 22. At this time, the negative pressure decreases, the spring 24 returns to its original state to provide elastic force, and the hydraulic oil 3 is injected into the cylinder 22 to drive the hollow plunger rod 25 to rise. At this time, the lower end of the push rod 23 is still in contact with the inner bottom surface of the cylinder 22.

[0036] Third stage: When the hollow plunger rod 25 rises to the point where the first column 231 of the booster rod 23 abuts against the through hole, the oil pump continues to pump oil into the cylinder 22. Under the pressure provided by the hydraulic oil 3, the hollow plunger rod 25 is lifted, which drives the booster rod 23 to rise upward.

[0037] Specifically, such as Figs. 4-6 As shown, a scissor lift platform 1 includes a platform 11, a base plate 12, a first connecting member 26, a first support rod 13, a second support rod 14, and a hydraulic cylinder 2. The platform 11 is located above the base plate 12. The middle part of the first support rod 13 is hinged to the middle part of the second support rod 14. The upper ends of the first support rod 13 and the second support rod 14 are respectively hinged to the left and right ends of the platform 11, and the lower ends of the first support rod 13 and the second support rod 14 are respectively hinged to the left and right ends of the base plate 12.

[0038] More specifically, the scissor lift 1 further comprises a first traction member 15 and a second traction member 16, the first traction member 15 is fixed between the upper end of the first support rod 13 and the middle part of the first support rod 13, and the second traction member 16 is fixed between the lower end of the second support rod 14 and the middle part of the second support rod 14. The first connecting member 26 is hinged to the first traction member 15, and the first connecting member 26 is located between the first support rod 13 and the first traction member 15; the second connecting member 27 is hinged to the second traction member 16, and the second connecting member 26 is located between the second support rod 14 and the second traction member 16. When the scissor lift 1 is raised, the oil cylinder 2 moves under the action of the first traction member 15 and the second traction member 16, so as to adjust the power direction of the oil cylinder 2 to the scissor lift 1, and reduce the dispersion of force.

[0039] In actual application, the first stage: the oil pump pumps out the hydraulic oil 3 in the oil cylinder 2, so that the cylinder barrel 22 maintains a vacuum state, and the scissor lift 1 maintains a pressing state, at this time the spring 24 is compressed to store a certain elastic force.

[0040] The second stage: when the scissor lift 1 starts, the oil pump starts to pump the hydraulic oil 3 into the cylinder barrel 22, at this time the spring 24 restores to release the elastic potential energy, the negative pressure in the cylinder barrel 22 decreases, and the elastic force provided by the spring 24 and the thrust brought by the injection of the hydraulic oil 3 provide the initial power for the lifting of the scissor lift 1, and the scissor lift 1 can normally rise under the limited pressure provided by the hydraulic oil 3 with the assistance of the spring 24.

[0041] The third stage: the oil pump pumps the hydraulic oil 3 into the cylinder barrel 22 through the inlet and outlet, the hydraulic oil 3 pushes the boost rod 23 and the hollow plunger rod 25 to lift outward, and drives the scissor lift 1 to completely rise.

Claims

1. A hydraulic cylinder, comprising a cylinder barrel, inlet and outlet oil pipes, and a push rod, wherein the inlet and outlet oil pipes are located at the bottom of the cylinder barrel and communicate with the inner cavity of the cylinder barrel, characterized in that: It also includes a spring and a hollow plunger rod, the hollow plunger rod being sleeved inside the cylinder; the lower end of the hollow plunger rod is provided with a through hole, the booster rod passes through the through hole, the spring is located inside the hollow plunger rod, one end of the spring abuts against the hollow plunger rod, and the other end abuts against the booster rod.

2. A hydraulic cylinder according to claim 1, characterized in that: The booster rod has a first column and a second column with a cross-sectional area smaller than the first column. The cross-sectional area of ​​the first column is larger than the cross-sectional area of ​​the through hole, and the cross-sectional area of ​​the second column is smaller than the cross-sectional area of ​​the through hole.

3. A hydraulic cylinder according to claim 1, characterized in that: The cylinder is provided with a telescopic port and an oil chamber from top to bottom, and the cross-sectional area of ​​the telescopic port is smaller than the cross-sectional area of ​​the oil chamber.

4. A hydraulic cylinder according to claim 3, characterized in that: The inner surface of the telescopic port is provided with multiple oil seals arranged at vertical intervals, and the oil seals are in contact with the outer surface of the hollow plunger rod.

5. A hydraulic cylinder according to claim 3, characterized in that: The inner surface of the telescopic port is also provided with a wear-resistant ring, which contacts the outer surface of the hollow plunger rod.

6. A hydraulic cylinder according to claim 1, characterized in that: The upper end of the hollow plunger rod is provided with a first connecting member, and the lower end of the cylinder is provided with a second connecting member.

7. A hydraulic cylinder according to claim 1, characterized in that: One end of the inlet and outlet oil pipe is provided with a first port located on the bottom surface inside the cylinder, and the other end is provided with a second port connected to the oil pump.

8. A scissor lift platform, comprising a platform, a base plate, a first support rod, and a second support rod, wherein the platform is disposed above the base plate, and the middle portions of the first and second support rods are hinged together; the upper ends of the first and second support rods are respectively hinged to the left and right ends of the platform, and the lower ends of the first and second support rods are respectively hinged to the left and right ends of the base plate, characterized in that: It also includes the hydraulic cylinder as described in claim 6, wherein one end of the hydraulic cylinder is hinged to the upper half of the first support rod and the other end is hinged to the lower half of the second support rod.

9. A scissor lift platform according to claim 8, characterized in that: It also includes a first traction member and a second traction member. The first traction member is fixed between the upper end of the first support rod and the middle part of the first support rod, and the second traction member is fixed between the lower end of the second support rod and the middle part of the second support rod. The first connecting member is hinged to the first traction member, and the second connecting member is hinged to the second traction member.

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