Jacking device for detection

Abstract

The utility model relates to a jacking device for detection, which comprises a fixed base and a jacking platform, the fixed base is connected with a cross beam through two upright posts, two guide polish rods are respectively mounted between the fixed base and the cross beam, linear bearings are respectively mounted on the two guide polish rods in a sliding manner, and the jacking platform is fixed on the two linear bearings. A cylinder is vertically mounted on the fixed base and located between the two stand columns, a piston rod of the cylinder is upward and connected with a movable chain wheel seat, a movable chain wheel is rotatably mounted on the movable chain wheel seat, a fixed chain wheel seat staggered with the movable chain wheel seat is mounted on the bottom face of the cross beam, and a fixed chain wheel is rotatably mounted on the fixed chain wheel seat. A second connecting point is arranged on the bottom surface of the cross beam in the rotating surface of the fixed chain wheel; a chain is fixedly connected between the first connecting point and the second connecting point. The air cylinder load can be effectively reduced, the service life is prolonged, meanwhile, the lifting distance of the jacking platform is increased, and the overall flexibility is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to a jacking device for detection. Background Art

[0002] At present, most universal testing machines used to detect and test various characteristics adopt a screw-nut mechanism to achieve the jacking function. During the use of the jacking platform driven by the screw-nut mechanism, if there is foreign matter on the screw, the nut will be stuck (blocked) on the screw. At this time, under the action of the load and the limit rod, the screw cannot rotate normally. Due to the working principle of the motor, if the output shaft does not rotate, the resistance inside the motor will decrease, the current will increase, and the heat will increase. In this state for a certain period of time, it will cause the motor to burn out. In addition, when the jacking platform of the existing technology faces large-mass specimens, the load between the screw and nut is large, which is easy to wear, resulting in a decrease in service life. In addition, in order to meet the needs of different height detection, a longer screw needs to be configured to meet the height requirements. The equipment is large in size and occupies a large space, which is not easy to transport and transfer. Utility Model Content

[0003] In response to the deficiencies of the existing technology, the utility model provides a jacking device for detection, which can effectively reduce the cylinder load, extend the service life and increase the lifting distance of the jacking platform. It has a small size, occupies little space and has good overall flexibility.

[0004] The utility model is achieved through the following technical solutions:

[0005] A jacking device for detection is provided, including a fixed base and a jacking platform, a fixed base is connected to a crossbeam through two columns, two guide light rods arranged at intervals are vertically installed between the fixed base and the crossbeam, linear bearings are slidably installed on the two guide light rods, the jacking platform is fixed on the two linear bearings, a cylinder is vertically installed on the fixed base in the middle of the two columns, the piston rod of the cylinder is upward and connected to a movable sprocket seat, a movable sprocket is rotatably installed on the movable sprocket seat, a fixed sprocket seat staggered with the movable sprocket seat is installed on the bottom surface of the crossbeam, a fixed sprocket is rotatably installed on the fixed sprocket seat, a first connection point is provided on the side of the lifting platform facing the cylinder, a second connection point is provided on the bottom surface of the crossbeam within the rotating surface of the fixed sprocket, a chain is fixedly connected between the first connection point and the second connection point, and the chain is sequentially wound around the fixed sprocket and the movable sprocket through the first connection point and then connected to the second connection point.

[0006] Furthermore, the air inlet of the cylinder is connected to the lower induced check valve, and the air outlet of the cylinder is connected to the upper induced check valve. The upper and lower induced check valves are symmetrically arranged about the cylinder. The induced check valve is provided with a pilot port, an air inlet and an air outlet. The air outlet of the lower induced check valve is connected to the air inlet of the cylinder, and the air outlet of the upper induced check valve is connected to the air outlet of the cylinder.

[0007] By installing induced check valves at the air inlet and outlet of the cylinder respectively, it can effectively prevent the cylinder from losing power after accidental air failure and the jacking platform from falling due to its own weight, thereby effectively improving the safety of use.

[0008] Furthermore, a lower speed regulating valve is installed at the air inlet above the lower induction check valve, and the other interface of the lower speed regulating valve is connected to the pilot port of the upper induction check valve and the double-control solenoid valve through a three-way connection; an upper speed regulating valve is installed at the air inlet below the upper induction check valve, and the other interface of the upper speed regulating valve is connected to the pilot port of the lower induction check valve and the double-control solenoid valve through a three-way connection.

[0009] By configuring the speed control valve and the double-control solenoid valve, the speed of the cylinder piston rod can be effectively adjusted to meet the use requirements of different field mirrors. At the same time, the double-control solenoid valve can be conveniently coordinated with the two induced check valves to realize the anti-fall function of air-off holding.

[0010] Beneficial effects of the utility model:

[0011] This utility model's lifting device utilizes a movable sprocket, a fixed sprocket, and a chain to form a combined lifting mode of fixed and movable pulleys. This, in conjunction with a pneumatic cylinder, allows the lifting platform to be raised and lowered. This not only effectively reduces the load on the cylinder, but also allows the lifting platform to have a stroke twice the length of the cylinder piston rod, meeting the requirements of various testing and inspection tests, and expanding the platform's applicability. The overall design occupies minimal space, is convenient for transportation and transfer, and offers high flexibility.

[0012] The air inlet and outlet of the cylinder are respectively installed with induced check valves, which are used in conjunction with the double-control solenoid valve and the speed regulating valve. This can not only realize the flexible adjustment of the extension and retraction speed of the cylinder piston rod to meet different lifting speed requirements, but also effectively prevent the cylinder from losing power after an accidental gas outage, and the occurrence of the jacking platform falling, thereby greatly improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 2 This is a schematic diagram of the connection structure between the cylinder, chain and jacking platform in the utility model.

[0015] Figure 3 This is a schematic diagram of the connection between the jacking platform and the guide light rod in the utility model.

[0016] Figure 4 This is a schematic diagram of the gas circuit connection of the cylinder in the utility model.

[0017] As shown in the figure:

[0018] 1. Fixed base, 2. Lifting platform, 3. Column, 4. Beam, 5. Guide light rod, 6. Cylinder, 7. Movable sprocket seat, 8. Movable sprocket, 9. Chain, 10. Fixed sprocket seat, 11. Fixed sprocket, 12. Second connection point, 13. First connection point, 14. Linear bearing, 15. Lower induced check valve, 16. Pilot port, 17. Upper induced check valve, 18. Lower speed regulating valve, 19. Upper speed regulating valve, 20. Three-way valve, 21. Double-control solenoid valve. DETAILED DESCRIPTION

[0019] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0020] A jacking device for detection includes a fixed base 1 and a jacking platform 2. The fixed base 1 is connected to a crossbeam 4 through two columns 3. Two guide light rods 5 set at intervals are vertically installed between the fixed base 1 and the crossbeam 4. Linear bearings 14 are slidably installed on the two guide light rods 5. The jacking platform 2 is fixed on the two linear bearings 14. A cylinder 6 is vertically installed in the middle of the two columns 3 on the fixed base 1. The piston rod of the cylinder 6 is upward and connected to a movable sprocket seat 7. A movable sprocket seat 7 is rotatably installed on the movable sprocket seat Sprocket 8, the bottom surface of the crossbeam 4 is equipped with a fixed sprocket seat 10 which is staggered with the movable sprocket seat 8, and a fixed sprocket 11 is rotatably installed on the fixed sprocket seat 10. A first connection point 13 is provided on the side of the lifting platform 2 facing the cylinder 6, and a second connection point 12 is provided on the bottom surface of the crossbeam 4 within the rotating surface of the fixed sprocket 11. A chain 9 is fixedly connected between the first connection point 13 and the second connection point 12. The chain 9 is wound around the fixed sprocket 11 and the movable sprocket 8 in sequence through the first connection point 13 and is connected to the second connection point 12.

[0021] The air inlet of the cylinder 6 is connected to the lower induction check valve 15, and the air outlet of the cylinder 6 is connected to the upper induction check valve 17. The upper and lower induction check valves are symmetrically arranged about the cylinder 6. The induction check valves are provided with a pilot port 16, an air inlet, and an air outlet. The air outlet of the lower induction check valve 15 is connected to the air inlet of the cylinder 6, and the air outlet of the upper induction check valve 17 is connected to the air outlet of the cylinder 6. The lower speed regulating valve 18 is installed at the air inlet above the lower induction check valve 15. The other port of the lower speed regulating valve 18 is connected to the pilot port 16 of the upper induction check valve 17 and the dual-control solenoid valve 21 respectively through a tee 20. The upper speed regulating valve 18 is installed at the air inlet below the upper induction check valve 15. The other port of the upper speed regulating valve 18 is connected to the pilot port 16 of the lower induction check valve and the dual-control solenoid valve 21 respectively through a tee 20.

[0022] When the utility model is in use, when it is necessary to control the jacking platform 2 to rise, the cylinder 6 can be started, and the piston rod of the cylinder 6 can be retracted downward. At this time, the end of the piston rod pulls the movable sprocket seat 7 down, and the movable sprocket 8 in the movable sprocket seat 7 rotates. The fixed sprocket 11 on the bottom surface of the beam 4 rotates synchronously with the chain 9. The chain 9 can be used to apply an upward force to the jacking platform 2. The jacking platform 2 can move upward along the length direction of the guide light rod 5 through the limiting and guiding effect of the linear bearing 14 and the guide light rod 5, thereby realizing the lifting action of the jacking platform 2 driving the detection sample to rise.

[0023] When it is necessary to control the jacking platform 2 to descend, the piston rod of the cylinder 6 is pushed upward in the opposite direction. At this time, the end of the piston rod pushes the movable sprocket seat 7 to rise, and the movable sprocket 8 in the movable sprocket seat 7 rotates and pushes the chain 9 upward at the same time. The fixed sprocket 11 on the bottom of the beam 4 rotates to lower the chain 9, causing the jacking platform 2 to descend naturally.

[0024] When the jacking platform 2 rises, the double-control solenoid valve 21 connected to the tee introduces the gas into the tee 20 for diversion. The first stream of gas enters the lower induction check valve 15 along the lower speed regulating valve 18. Since the valve disc in the lower induction check valve 15 is not impacted by the air flow and is in a closed state, the air inlet and the air outlet of the lower induction check valve 15 are one-way connected. The gas can only enter the air inlet of the cylinder 6 from the air outlet of the lower induction check valve 15, and increase the gas density in the lower half of the cylinder 6, increase the air pressure, and squeeze the piston rod to move upward. The other stream of gas is connected to the pilot port 16 of the upper induction check valve 17 through the tee and enters the upper induction check valve 17, impacting the valve disc in the upper induction check valve 17, making it in an open state. The air inlet and the air outlet of the upper induction check valve 17 are bidirectionally connected, and the gas in the upper half of the cylinder 6 is discharged from the air outlet, completing the rising action.

[0025] During the operation of the jacking platform 2, if the gas source is disconnected, the jacking platform 2 tends to descend due to its own weight. At this time, there is no ventilation in the upper induced check valve 17 and the lower induced check valve 15, and the valve flaps of both are in a closed state. The gas in the lower half of the cylinder 6 cannot be discharged from the air outlet of the lower induced check valve 15 to the air inlet, and the gas in the upper half of the cylinder 6 cannot be discharged from the air outlet of the upper induced check valve 17 to the air inlet. The gas is squeezed in the cylinder body of the cylinder 6, and the jacking platform 2 cannot descend, forming a self-locking state.

[0026] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A jacking device for testing, comprising a fixed base and a jacking platform, wherein the fixed base is connected to a crossbeam via two columns, and wherein: Two guide light rods with intervals are vertically installed between the fixed base and the crossbeam, and linear bearings are slidably installed on the two guide light rods. The jacking platform is fixed on the two linear bearings, and a cylinder is vertically installed on the fixed base in the middle of the two columns. The piston rod of the cylinder is upward and connected to a movable sprocket seat, and a movable sprocket is rotatably installed on the movable sprocket seat. A fixed sprocket seat staggered with the movable sprocket seat is installed on the bottom surface of the crossbeam, and a fixed sprocket is rotatably installed on the fixed sprocket seat. A first connecting point is provided on the side of the lifting platform facing the cylinder, and a second connecting point is provided on the bottom surface of the crossbeam within the rotating surface of the fixed sprocket. A chain is fixedly connected between the first connecting point and the second connecting point, and the chain is sequentially wrapped around the fixed sprocket and the movable sprocket through the first connecting point and then connected to the second connecting point.

2. The detection lifting device according to claim 1, characterized in that: The air inlet of the cylinder is connected to the lower induced check valve, and the air outlet of the cylinder is connected to the upper induced check valve. The upper and lower induced check valves are symmetrically arranged about the cylinder. The induced check valve is provided with a pilot port, an air inlet and an air outlet. The air outlet of the lower induced check valve is connected to the air inlet of the cylinder, and the air outlet of the upper induced check valve is connected to the air outlet of the cylinder.

3. The detection lifting device according to claim 2, characterized in that: A lower speed regulating valve is installed at the air inlet above the lower induction check valve, and the other interface of the lower speed regulating valve is connected to the pilot port of the upper induction check valve and the double-control solenoid valve through a three-way connection; an upper speed regulating valve is installed at the air inlet below the upper induction check valve, and the other interface of the upper speed regulating valve is connected to the pilot port of the lower induction check valve and the double-control solenoid valve through a three-way connection.

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