Wireless transmission type double-column lifting machine

Abstract

This utility model discloses a wireless transmission type dual-post lift, comprising two opposing lifting post units. Each lifting post unit includes a post, a lifting section, a control box, a hydraulic drive device, and two support arms mounted on the lifting section. The hydraulic drive device includes an oil pump, a valve block, and an oil reservoir. The valve block is equipped with a first solenoid valve, a second solenoid valve, a check valve, and an oil outlet connector. The lifting cylinder is connected to the oil reservoir via the parallel first and second solenoid valves. This utility model achieves lifting while simultaneously controlling the oil volume in the rodless chamber of the lifting cylinder through the second solenoid valve. When one side is higher, releasing hydraulic oil reduces the lifting speed or increases the lowering speed on that side, achieving synchronization of the two posts. It has advantages such as low cost, good real-time performance, and simple control logic.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle maintenance equipment, and specifically relates to a two-post lift. Background Technology

[0002] Two-post lifts are one of the main pieces of equipment in car repair. When using them, it is necessary to ensure that the two posts are raised and lowered synchronously, otherwise it may cause a safety accident.

[0003] Traditional two-post lifts employ a balancing steel cable forced synchronization mechanism, which has inherent drawbacks: First, due to the limited length of the balancing steel cable, the distance between the two posts is fixed and cannot be adjusted, requiring customized equipment for different vehicle widths; second, the traditional solution distinguishes between the main and auxiliary posts, necessitating separate manufacturing during production and strict differentiation during installation, increasing manufacturing difficulty and installation complexity. Although those skilled in the art have attempted to develop two-post lifts with adjustable post spacing, only limited dimensional adjustments have been achieved, and the structural complexity has significantly increased.

[0004] With the development of wireless communication and hydraulic control technologies, wireless transmission-based synchronous control schemes have emerged in existing technologies, such as the wirelessly independently controlled two-post lift disclosed in Chinese utility model patent CN222647540U. This scheme employs a completely independent main and auxiliary column design. The auxiliary column transmits height information to the main column via WiFi. The main column judges the height difference in real time, and when the difference is too large, it uses a proportional valve to adjust the lifting speed, ultimately achieving synchronization. Although this scheme eliminates the balance wire rope mechanism, it still has the following technical drawbacks: the proportional valve control scheme is not only costly but also suffers from response lag and is prone to over-adjustment. Utility Model Content

[0005] This invention proposes a wireless transmission type dual-column lift, the purpose of which is to solve the problems of high cost and slow response of synchronous control through proportional valves.

[0006] The technical solution of this utility model is as follows:

[0007] A wireless transmission type dual-post lift includes two lifting post units arranged opposite each other. Each lifting post unit includes a column, a lifting part, a control box, a hydraulic drive device, and two support arms installed on the lifting part.

[0008] The column includes a column body and a lifting cylinder and a displacement sensor installed in the column body. The lifting cylinder is used to drive the lifting part to move up and down along the column. The displacement sensor is used to detect the height of the lifting part and send the height information to the control box.

[0009] The hydraulic drive device includes an oil pump;

[0010] The control box is electrically connected to the control terminal of the oil pump and is used to control the lifting cylinder movement through the hydraulic drive device.

[0011] The control boxes of the two lifting column units are also connected wirelessly.

[0012] The hydraulic drive device also includes a valve block and an oil storage tank. The valve block is equipped with a first solenoid valve, a second solenoid valve, a check valve, and an oil outlet connector.

[0013] The oil pump is mounted on the valve block. The oil inlet of the oil pump is connected to the oil storage tank, and the oil outlet is connected to the oil outlet connector through a one-way valve. The oil outlet connector is connected to the rodless chamber of the lifting cylinder.

[0014] The oil inlet of the first solenoid valve is connected to the rodless chamber of the lifting cylinder, and the oil outlet is connected to the oil storage tank.

[0015] The oil inlet of the second solenoid valve is connected to the rodless chamber of the lifting cylinder, and the oil outlet is connected to the oil storage tank.

[0016] The control terminals of the first and second solenoid valves are both electrically connected to the control box.

[0017] As a further improvement to the wireless transmission dual-column lift: the displacement sensor is a pull-wire sensor installed on the upper end of the column, and the extended end of the pull-wire sensor is fixedly connected to the lifting part.

[0018] As a further improvement to the wireless transmission type dual-column lift: the lifting part includes a square cylindrical lifting seat, which is set in the inner cavity of the column, and a slider that slides and engages with the inner wall of the column is installed on its outer surface.

[0019] As a further improvement to the wireless transmission dual-post lift: the position of the lifting cylinder corresponds to the position of the inner cavity of the lifting seat, the lower end is fixedly connected to the column, and the upper end is equipped with a roller; a chain is also provided in the column, one end of the chain is fixedly connected to the column, and the other end is fixedly connected to the lifting seat; the roller cooperates with the chain.

[0020] As a further improvement to the wireless transmission type two-post lift: the lifting part also includes a locking bar installed on the lifting seat, and the locking bar is provided with a plurality of locking holes evenly distributed in the vertical direction;

[0021] The lifting column unit also includes a locking mechanism mounted on the column body, the locking mechanism including a rotatable locking block for engaging with a keyhole.

[0022] As a further improvement to the wireless transmission dual-post lift, the locking mechanism further includes a cylinder, a torsion spring, a connecting rod, and a lock seat.

[0023] The lock seat is mounted on the column and has an opening that connects to the inner cavity of the column. The lock block is rotatably mounted on the lock seat and has two protrusions that form a V-groove. One protrusion passes through the opening and is inserted into the lock hole, while the other protrusion is located outside the opening of the lock seat. The torsion spring drives the lock block to rotate, causing the other protrusion to contact the upper edge of the opening.

[0024] One end of the cylinder is rotatably connected to the column body, and the other end is rotatably connected to one end of the connecting rod, while the other end of the connecting rod is rotatably connected to the locking block.

[0025] As a further improvement to the wireless transmission type two-post lift: the lifting seat is connected to a slide, which is located inside the column;

[0026] The inner end of the support arm is rotatably connected to the slide table, and a follower tooth block is fixedly installed on the inner end of the support arm. The axis of the inner end of the support arm rotatably connected to the slide table coincides with the axis of the follower tooth block.

[0027] A locking pin is mounted on the slide table via a sliding fit. A fixed tooth block is fixedly mounted on the locking pin. The locking pin is used to drive the fixed tooth block to move up and down to achieve engagement and disengagement with the follower tooth block.

[0028] A spring is fitted on the outside of the locking pin shaft. The upper end of the spring contacts the top plate of the slide table, and the lower end contacts the fixed tooth block, so as to push the fixed tooth block to a position where it can mesh with the follower tooth block.

[0029] The fixed tooth block also contacts and engages with the slide table to restrict the fixed tooth block from rotating relative to the slide table.

[0030] As a further improvement to the wireless transmission dual-post lift: the main body of the support arm is a telescopic arm, which includes multiple sleeved support arms; for any two sets of sleeved support arms, a limiting groove parallel to the telescopic direction is opened on the inner support arm, and a limiting screw is installed on the outer support arm, the limiting screw cooperating with the limiting groove.

[0031] As a further improvement to the wireless transmission type two-post lift: the hydraulic drive device is installed on the outer side of the upper end of the column, and the control box is fixed to the outer side of the middle part of the column by a support plate.

[0032] As a further improvement to the wireless transmission dual-post lift, the hydraulic drive unit also includes an adjustable throttle valve, which is installed on the pipeline between the oil outlet of the second solenoid valve and the oil reservoir.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] 1. This utility model, while achieving lifting, further controls the oil volume in the rodless chamber of the lifting cylinder via a second solenoid valve. When one side is higher, releasing hydraulic oil reduces the lifting speed or increases the lowering speed on that side, achieving synchronization of the two columns. This solution, based on a common solenoid valve, is not only low-cost but also provides timely response, ensuring real-time synchronous control.

[0035] 2. In this invention, the upward movement is controlled by an oil pump, and the downward movement is controlled by a first solenoid valve. When the two sides are not synchronized, the second solenoid valve on the higher side opens to achieve synchronization control. The three are independent of each other, meaning that regardless of whether it is rising or falling, the second solenoid valve can intervene according to the current state to achieve synchronization without changing the working state of the oil pump and the first solenoid valve, thus greatly simplifying the logic of synchronization control.

[0036] 3. Both lifting column units are equipped with the same control box and hydraulic drive device, eliminating the distinction between primary and secondary units, which facilitates standardized production and simplifies the on-site installation process. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of this utility model;

[0038] Figure 2 An exploded view of the column and lifting section of one of the lifting column units;

[0039] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0040] Figure 4 for Figure 2 A magnified view of part B in the middle section;

[0041] Figure 5 This is a top view of the lifting column unit excluding the support arms; the top of the column is open in the figure.

[0042] Figure 6 for Figure 5 A magnified view of part C in the middle;

[0043] Figure 7 Exploded view of the column, lifting mechanism, locking mechanism, and control box;

[0044] Figure 8 This is a schematic diagram of the locking mechanism.

[0045] Figure 9 This is a 3D view of one of the lifting column units;

[0046] Figure 10 for Figure 9 A magnified view of part D in the middle;

[0047] Figure 11 Exploded view of the lifting section and the support arm section;

[0048] Figure 12 This is a schematic diagram showing the connection between the hydraulic drive device and the lifting cylinder;

[0049] Figure 13 This is a hydraulic schematic diagram of a hydraulic drive device.

[0050] Figure 14 This is an exploded view of the control box section.

[0051] The reference numerals in the figures include:

[0052] 1. Column; 2. Locking mechanism; 3. Control box; 4. Hydraulic drive device; 5. Lifting part; 6. Support arm; 1-1. Column body; 1-2. Lifting cylinder; 1-3. Chain; 1-4. Roller; 1-5. Limit switch; 1-6. Pull-wire sensor; 1-7. Support plate; 2-1. Locking block; 2-2. Torsion spring; 2-3. Cylinder; 2-4. Protective cover; 2-5. Connecting rod; 2-6. Lock seat; 3-1. Box body; 3-2. Power module; 3-3. Controller; 3-4. Contactor; 3-5. Panel; 3-6. Touch screen; 3-7. Emergency stop switch; 3-8. Up button; 3-9. Down button; 3-10. Locking button; 3-11. Power indicator light; 3-12. Alarm indicator; 3-13. Switch; 4-1. Oil pump; 4-2. Valve block; 4-3. Oil outlet connector; 4-4. First solenoid valve; 4-5. Second solenoid valve; 4-6. Oil reservoir; 4-7. Check valve; 4-8. Adjustable throttle valve (4-8); 5-1. Lifting seat; 5-2. Slider; 5-3. Locking bar; 5-4. Slide table; 6-1. Telescopic arm; 6-2. Follower gear block; 6-3. Limit groove; 6-4. Limit screw; 6-5. Tray; 6-6. Locking pin; 6-7. Spring; 6-8. Fixed gear block. Detailed Implementation

[0053] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0054] like Figure 1 and Figure 9 A wireless transmission type dual-post lift includes two lifting post units arranged opposite each other. Each lifting post unit includes a post 1, a lifting part 5, a control box 3, a hydraulic drive device 4, and two support arms 6 installed on the lifting part 5.

[0055] Specifically, such as Figure 2 The column 1 includes a column body 1-1 and a lifting cylinder 1-2 and a displacement sensor installed in the column body 1-1.

[0056] like Figure 2 , Figure 3 , Figure 5 and Figure 6 The main body of column 1-1 is made of shaped steel and has a vertical inner cavity. The lifting cylinder 1-2 drives the lifting part 5 to move up and down along column 1. The lifting part 5 includes a square-shaped lifting seat 5-1, which is located inside the inner cavity of column 1-1. Eight sliders 5-2 are installed on the top and bottom of its outer surface, slidingly engaging with the inner wall of column 1-1. The position of the lifting cylinder 1-2 corresponds to the position inside the lifting seat 5-1 to ensure it can pass through. The lower end of the lifting cylinder 1-2 is fixedly connected to column 1-1, and the upper end is equipped with a roller 1-4. A chain 1-3 is also provided in column 1-1, with one end fixedly connected to column 1-1 and the other end fixedly connected to the lifting seat 5-1. The roller 1-4 cooperates with the chain 1-3. When hydraulic oil enters the rodless chamber at the bottom of the lifting cylinder 1-2, the piston rod extends, and the roller 1-4 drives the chain 1-3 to rotate, lifting the lifting seat 5-1. When the rodless chamber of the lifting cylinder 1-2 opens, the lifting part 5 will press down on the lifting cylinder 1-2 under gravity, causing the hydraulic oil in the rodless chamber to flow out, and the lifting part 5 will descend.

[0057] like Figure 4 Limit switches 1-5 are installed at the upper and lower ends of the column 1-1 respectively. When the lifting seat 5-1 touches the limit switch 1-5, the control box 3 will receive a signal and stop controlling the lifting cylinder 1-2.

[0058] The displacement sensor is used to detect the height of the lifting part 5 and send the height information to the control box 3. In this embodiment, the displacement sensor is a pull-wire sensor 1-6 installed on the upper end of the column 1-1, and the extended end of the pull-wire sensor 1-6 is fixedly connected to the lifting part 5.

[0059] like Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The lifting part 5 also includes a locking bar 5-3 installed on the lifting base 5-1, and the locking bar 5-3 is provided with a plurality of locking holes evenly distributed in the vertical direction.

[0060] The lifting column unit also includes a locking mechanism 2 mounted on the column 1-1. The locking mechanism 2 includes a rotatable locking block 2-1, which engages with a lock hole. Specifically, the locking mechanism 2 also includes a cylinder 2-3, a torsion spring 2-2, a connecting rod 2-5, and a lock seat 2-6. The lock seat 2-6 is mounted on the column 1-1 and has an opening that connects to the inner cavity of the column 1-1. The locking block 2-1 is rotatably mounted on the lock seat 2-6 and has two protrusions forming a V-groove. One protrusion passes through the opening and is inserted into the lock hole, with a slope below it. The other protrusion is located outside the opening of the lock seat 2-6. The torsion spring 2-2 drives the locking block 2-1 to rotate, causing the other protrusion to contact the upper edge of the opening. One end of the cylinder 2-3 is rotatably connected to the column 1-1, and the other end is rotatably connected to one end of the connecting rod 2-5. The other end of the connecting rod 2-5 is rotatably connected to the locking block 2-1.

[0061] The cylinder 2-3 is controlled by the control box 3. When locking, the cylinder 2-3 is in a free extension / retraction state. The torsion spring 2-2 will cause another protrusion of the locking block 2-1 to contact the upper edge of the opening. At this time, one protrusion passes through the opening and is inserted into the lock hole. If the lifting seat 5-1 falls unexpectedly, the lock hole will cause the locking block 2-1 to tend to continue rotating. However, at this time, the other protrusion has already contacted the upper edge of the opening and cannot continue to rotate, thus preventing the locking bar 5-3 from continuing to descend, achieving the purpose of locking and preventing a fall. When unlocking, the lifting cylinder 1-2 first extends a certain distance, and then the cylinder 2-3 retracts, causing one protrusion of the locking block 2-1 to withdraw from the lock hole and opening. At this time, the lifting seat 5-1 can freely rise or fall, and lock again after reaching the target height.

[0062] like Figure 9 , Figure 10 and Figure 11The lifting seat 5-1 is connected to a slide 5-4, which is located inside the column 1. The inner end of the support arm 6 is rotatably connected to the slide 5-4, and a follower tooth block 6-2 is fixedly installed on the inner end of the support arm 6. The axis of the rotatable connection between the inner end of the support arm 6 and the slide 5-4 coincides with the axis of the follower tooth block 6-2. A locking pin 6-6 is installed on the slide 5-4 via a sliding fit. A fixed tooth block 6-8 is fixedly installed on the locking pin 6-6. The locking pin 6-6 is used to drive the fixed tooth block 6-8 to move up and down to achieve engagement and disengagement with the follower tooth block 6-2. A spring 6-7 is fitted on the outer side of the locking pin 6-6. The upper end of the spring 6-7 contacts the top plate of the slide 5-4, and the lower end contacts the fixed tooth block 6-8 to push the fixed tooth block 6-8 to a position where it can engage with the follower tooth block 6-2. The fixed tooth block 6-8 also engages with the slide table 5-4 to restrict the fixed tooth block 6-8 from rotating relative to the slide table 5-4.

[0063] When the angle of the support arm 6 needs to be adjusted, pull up the locking pin 6-6 to separate the fixed tooth block 6-8 from the follower tooth block 6-2, at which point the support arm 6 can rotate freely. After releasing the locking pin 6-6, the fixed tooth block 6-8 will fall under the action of the spring 6-7 and re-engage with the follower tooth block 6-2, making the support arm 6 unable to rotate.

[0064] Furthermore, the main body of the support arm 6 is a telescopic arm 6-1, which includes multiple sleeved support arms. For any two sets of sleeved support arms, the inner support arm has a limiting groove 6-3 parallel to the telescopic direction, and the outer support arm is equipped with a limiting screw 6-4, which cooperates with the limiting groove 6-3.

[0065] The end of the telescopic arm 6-1 is also fitted with a flexible tray 6-5 via a threaded connection.

[0066] like Figure 12 and Figure 13The hydraulic drive device 4 is installed on the outer side of the upper end of the column 1-1. The hydraulic drive device 4 includes an oil pump 4-1, a valve block 4-2, and an oil storage tank 4-6. A first solenoid valve 4-4, a second solenoid valve 4-5, a check valve 4-7, and an oil outlet connector 4-3 are installed on the valve block 4-2. The oil pump 4-1 is mounted on the valve block 4-2, and its control terminal is electrically connected to the control box 3. The oil inlet of the oil pump 4-1 is connected to the oil storage tank 4-6, and its outlet is connected to the oil outlet connector 4-3 via the check valve 4-7. The oil outlet connector 4-3 is connected to the rodless chamber of the lifting cylinder 1-2. The oil inlet of the first solenoid valve 4-4 is connected to the rodless chamber of the lifting cylinder 1-2, and its outlet is connected to the oil storage tank 4-6. The oil inlet of the second solenoid valve 4-5 is connected to the rodless chamber of the lifting cylinder 1-2, and its outlet is connected to the oil storage tank 4-6. The control terminals of the first solenoid valve 4-4 and the second solenoid valve 4-5 are both electrically connected to the control box 3. Both the first solenoid valve 4-4 and the second solenoid valve 4-5 are two-position two-way solenoid valves. When in the first position, the solenoid valve is turned on, and when switched to the second position, the solenoid valve is turned off.

[0067] Furthermore, the hydraulic drive device 4 also includes an adjustable throttle valve 4-8, which is installed on the pipeline between the oil outlet of the second solenoid valve 4-5 and the oil storage tank 4-6, and is used to control the flow rate of the return oil through the second solenoid valve 4-5.

[0068] like Figure 7 and 9 The control box 3 is fixed to the outer side of the middle part of the column 1-1 by two support plates 1-7. The locking mechanism 2 is located between the two support plates 1-7, which facilitates the connection between the control end of the control box 3 and the solenoid valve in the locking mechanism 2 used to control the action of the cylinder 2-3.

[0069] The control boxes 3 of the two lifting column units are also connected wirelessly. In this embodiment, the wireless communication method is Wi-Fi. Optionally, the two control boxes 3 can also exchange height information via Bluetooth, LoRa, or other methods.

[0070] Furthermore, such as Figure 14The control box 3 includes a housing 3-1 and a panel 3-5 mounted on the front of the housing 3-1. The housing 3-1 houses a controller 3-3, a power module 3-2, a contactor 3-4, relays, etc. The panel 3-5 is equipped with a touchscreen 3-6, an emergency stop switch 3-7, an up button 3-8, a down button 3-9, a lock button 3-10, a switch 3-13, a power indicator light 3-11, and an alarm indicator 3-12. The incoming AC power is converted to 24V DC power by the power module 3-2 to power the controller 3-3 and other components. The controller 3-3 receives height information signals from the push-button switches, limit switches 1-5, the pull-wire sensor 1-6, and the control box 3 on the opposite side. After logical processing, it sends control signals to the oil pump 4-1, the first solenoid valve 4-4, the second solenoid valve 4-5, and the solenoid valve connected to the cylinder 2-3. When controlling oil pump 4-1, controller 3-3 controls contactor 3-4 to close via relay, energizing oil pump 4-1 and enabling start-stop control. Up button 3-8 and down button 3-9 control up and down movement respectively, while lock button 3-10 controls locking and unlocking of locking mechanism 2. Switch 3-13 controls the current operating status of the lifting column assembly. When switched to the first position, control box 3 can only control up and down movement on its own side, used for initial unilateral height adjustment; at this time, control box 3 does not monitor synchronization between the two sides. When switched to the second position, regardless of which control box 3's up, down, or lock button 3-10 is pressed, control box 3 will send the signal to the opposite side, and both sides will execute the same control command simultaneously, achieving synchronous control during this process.

[0071] The working principle of this device is as follows:

[0072] When the lifting section 5 and the support arm 6 rise, the control box 3 keeps the first solenoid valve 4-4 and the second solenoid valve 4-5 closed, then unlocks the locking mechanism 2, and then starts the oil pump 4-1. Hydraulic oil enters the rodless chamber through the check valve 4-7, causing the lifting cylinder 1-2 to extend. After rising to the designated height, the oil pump 4-1 is turned off. Because the check valve 4-7 reverses and cuts off, the lifting cylinder 1-2 will maintain its original height. Then it will relock.

[0073] When the lifting section 5 and the support arm 6 are lowered, the system first unlocks, then controls the first solenoid valve 4-4 to open. Under the action of gravity, the hydraulic oil in the rodless chamber returns to the oil reservoir 4-6 through the first solenoid valve 4-4, thus achieving the lowering function. After lowering to the designated height, the system controls the first solenoid valve 4-4 to close, and then relocks.

[0074] Synchronous control refers to the exchange of height information between the two control boxes 3 via wireless communication (such as Wi-Fi signals) during ascent or descent. After receiving the other's height, control box 3 compares it with its own. If it is higher and the difference exceeds a preset threshold, it indicates a lack of synchronization. Control box 3 will then activate its own second solenoid valve 4-5 to reduce the height difference until it falls below the preset threshold. Specifically, during ascent, if one side is higher, the control box 3 on that side will open the corresponding second solenoid valve 4-5. At this time, some of the hydraulic pressure pumped by oil pump 4-1 will directly return to the oil reservoir 4-6 via the second solenoid valve 4-5, reducing the oil flow rate into the lifting cylinder 1-2. This causes the ascent speed on that side to be lower than the other side, gradually bringing them to the same height. When in the lowering state, if one side is higher, the control box 3 on that side will also open the corresponding second solenoid valve 4-5. At this time, the hydraulic oil in the lifting cylinder 1-2 returns to the oil storage tank 4-6 through the first solenoid valve 4-4 and the second solenoid valve 4-5, which increases the oil flow of the lifting cylinder 1-2. The lowering speed on that side is faster than the other side, so that the two sides gradually reach the same height.

[0075] Therefore, when there is a situation of unequal height, the control box 3 only needs to open the second solenoid valve 4-5 on its own side, without changing the current working state of the oil pump 4-1 and the first solenoid valve 4-4, and without sending a control signal to the other side.

[0076] Special Note: Those skilled in the art do not need to make any special modifications to the control program when implementing the above control logic. For example, the wirelessly independently controlled two-post lift disclosed in Chinese Utility Model Patent No. CN222647540U already implements the functions of "Wifi signal transmission," "height difference calculation," and "real-time height adjustment." When implementing this solution, those skilled in the art only need to modify the "real-time height adjustment" logic to control the second solenoid valve 4-5 on this side. This presents no implementation obstacles for those skilled in the art.

[0077] It should be noted that, as will be apparent to those skilled in the art, this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. The scope of this utility model is defined by the claims rather than the foregoing description.

Claims

1. A wireless transmission type dual-post lift, comprising two lifting post units arranged opposite each other, each lifting post unit comprising a column (1), a lifting part (5), a control box (3), a hydraulic drive device (4), and two support arms (6) mounted on the lifting part (5). The column (1) includes a column body (1-1) and a lifting cylinder (1-2) and a displacement sensor installed in the column body (1-1). The lifting cylinder (1-2) is used to drive the lifting part (5) to move up and down along the column (1). The displacement sensor is used to detect the height of the lifting part (5) and send the height information to the control box (3). The hydraulic drive device (4) includes an oil pump (4-1). The control box (3) is electrically connected to the control terminal of the oil pump (4-1) and is used to control the action of the lifting cylinder (1-2) through the hydraulic drive device (4); The control boxes (3) of the two lifting column units are also connected by wireless communication. Its features are: The hydraulic drive device (4) also includes a valve block (4-2) and an oil storage tank (4-6). The valve block (4-2) is equipped with a first solenoid valve (4-4), a second solenoid valve (4-5), a check valve (4-7), and an oil outlet connector (4-3). The oil pump (4-1) is mounted on the valve block (4-2). The oil inlet of the oil pump (4-1) is connected to the oil storage tank (4-6), and the oil outlet is connected to the oil outlet connector (4-3) through the one-way valve (4-7). The oil outlet connector (4-3) is connected to the rodless chamber of the lifting cylinder (1-2). The oil inlet of the first solenoid valve (4-4) is connected to the rodless chamber of the lifting cylinder (1-2), and the oil outlet is connected to the oil storage tank (4-6). The oil inlet of the second solenoid valve (4-5) is connected to the rodless chamber of the lifting cylinder (1-2), and the oil outlet is connected to the oil storage tank (4-6). The control terminals of the first solenoid valve (4-4) and the second solenoid valve (4-5) are both electrically connected to the control box (3).

2. The wireless transmission type dual-post lift as described in claim 1, characterized in that: The displacement sensor is a pull-wire sensor (1-6) installed on the upper end of the column (1-1), and the extended end of the pull-wire sensor (1-6) is fixedly connected to the lifting part (5).

3. The wireless transmission type two-post lift as described in claim 1, characterized in that: The lifting part (5) includes a square cylindrical lifting seat (5-1), which is located in the inner cavity of the column (1-1), and a slider (5-2) that slides and engages with the inner wall of the column (1-1) is installed on its outer side.

4. The wireless transmission type dual-post lift as described in claim 3, characterized in that: The position of the lifting cylinder (1-2) corresponds to the position of the inner cavity of the lifting seat (5-1). The lower end is fixedly connected to the column (1-1), and the upper end is equipped with a roller (1-4). A chain (1-3) is also provided in the column (1-1). One end of the chain (1-3) is fixedly connected to the column (1-1), and the other end is fixedly connected to the lifting seat (5-1). The roller (1-4) cooperates with the chain (1-3).

5. The wireless transmission type two-post lift as described in claim 3, characterized in that: The lifting part (5) also includes a locking bar (5-3) installed on the lifting base (5-1), and the locking bar (5-3) is provided with a plurality of locking holes evenly distributed in the vertical direction; The lifting column unit also includes a locking mechanism (2) mounted on the column (1-1), the locking mechanism (2) including a rotatable locking block (2-1) for engaging with a lock hole.

6. The wireless transmission type two-post lift as described in claim 5, characterized in that: The locking mechanism (2) also includes a cylinder (2-3), a torsion spring (2-2), a connecting rod (2-5), and a lock seat (2-6). The lock seat (2-6) is mounted on the column (1-1), and the lock seat (2-6) has an opening that connects to the inner cavity of the column (1-1). The lock block (2-1) is rotatably mounted on the lock seat (2-6), and the lock block (2-1) has two protrusions that form a V-groove between them. One of the protrusions passes through the opening and is used to insert into the lock hole, while the other protrusion is located outside the opening of the lock seat (2-6). The torsion spring (2-2) is used to drive the lock block (2-1) to rotate, so that the other protrusion contacts the upper edge of the opening. One end of the cylinder (2-3) is rotatably connected to the column (1-1), and the other end is rotatably connected to one end of the connecting rod (2-5). The other end of the connecting rod (2-5) is rotatably connected to the locking block (2-1).

7. The wireless transmission type two-post lift as described in claim 3, characterized in that: The lifting seat (5-1) is connected to a slide (5-4), and the slide (5-4) is located inside the column (1); The inner end of the support arm (6) is rotatably connected to the slide table (5-4), and a follower tooth block (6-2) is fixedly installed on the inner end of the support arm (6). The axis of the inner end of the support arm (6) rotatably connected to the slide table (5-4) coincides with the axis of the follower tooth block (6-2). A locking pin (6-6) is installed on the slide table (5-4) by sliding fit. A fixed tooth block (6-8) is fixedly installed on the locking pin (6-6). The locking pin (6-6) is used to drive the fixed tooth block (6-8) to move up and down to achieve engagement and disengagement with the follower tooth block (6-2). A spring (6-7) is fitted on the outside of the locking pin (6-6). The upper end of the spring (6-7) contacts the top plate of the slide (5-4), and the lower end contacts the fixed tooth block (6-8) to push the fixed tooth block (6-8) to a position where it can mesh with the follower tooth block (6-2). The fixed tooth block (6-8) also engages with the slide table (5-4) to restrict the fixed tooth block (6-8) from rotating relative to the slide table (5-4).

8. The wireless transmission type two-post lift as described in claim 3, characterized in that: The main body of the support arm (6) is a telescopic arm (6-1), which includes multiple sleeved support arms. For any two sets of sleeved support arms, a limiting groove (6-3) parallel to the telescopic direction is provided on the inner support arm, and a limiting screw (6-4) is installed on the outer support arm. The limiting screw (6-4) cooperates with the limiting groove (6-3).

9. The wireless transmission type two-post lift as described in claim 1, characterized in that: The hydraulic drive device (4) is installed on the outer side of the upper end of the column (1-1), and the control box (3) is fixed on the outer side of the middle part of the column (1-1) by the support plate (1-7).

10. The wireless transmission type two-post lift as described in claim 1, characterized in that: The hydraulic drive unit (4) also includes an adjustable throttle valve (4-8), which is installed on the pipeline between the oil outlet of the second solenoid valve (4-5) and the oil storage tank (4-6).

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