Worm and gear type elevator

Abstract

The utility model relates to the technical field of elevators, in particular to a worm and gear type elevator. The device comprises a bottom plate, two supporting foot frames are fixedly connected to the bottom of the bottom plate, a top plate is arranged above the bottom plate, a lifting mechanism is arranged between the top plate and the bottom plate and used for driving the top plate to vertically move up and down, wheel frames are symmetrically arranged on the upper surface of the top plate in a sliding mode, and dragging wheels are rotationally connected into the wheel frames. A distance adjusting mechanism is arranged on one sides of the two wheel carriers. According to the worm and gear type elevator, in the process that a top plate vertically moves upwards, dovetail joints on the two sides of a T-shaped rod slide towards the lower positions along the inner walls of two sliding grooves correspondingly, two external plates are pushed to synchronously move in the direction away from the T-shaped rod, then the distance between two wheel frames is increased, the supporting face of a workpiece on two dragging wheels is enlarged, and the workpiece is more stable. And the two dragging wheels can convey plate-shaped workpieces upwards more stably.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, and specifically, to a worm and worm gear type elevator. Background Art

[0002] An elevator is a device for carrying objects up and down.

[0003] The working principle of one kind of worm and worm gear type elevator is to place a workpiece on the elevator carrier roller. The servo motor provides power to the planetary reducer, and then the planetary reducer provides power to the worm and worm gear reducer. While the worm and worm gear reducer rotates, the lead screw also rotates synchronously. While the nut moves on the lead screw, it drives the upper seat plate bar, and then the upper seat plate bar drives the support arm to rise or fall, so as to achieve the purpose of automatic lifting.

[0004] When this kind of elevator transports a plate-shaped workpiece through the elevator carrier roller, it is necessary to adjust the distance between the two carrier rollers according to the width of the plate-shaped workpiece to stably place the workpiece on the two carrier rollers. However, the maximum distance between the two carrier rollers of the existing technology elevator cannot be greater than the width of the upper seat plate of the elevator. As a result, when the elevator transports a plate-shaped workpiece with a width greater than the upper seat plate upwards, there is a problem of poor stability of the plate-shaped workpiece. At the same time, since this kind of elevator drives the lead screw to rotate, and through the threaded connection between the lead screw and the nut, the nut moves on the lead screw to drive relevant components to achieve the lifting function. Therefore, the maintenance of the lead screw and the nut is very crucial. By maintaining to slow down the wear of the lead screw and the nut, the service life of the elevator can be effectively extended, and at the same time, the starting and stopping accuracy of the elevator can be ensured. A commonly used method to slow down the wear of the lead screw and the nut is to apply lubricating oil on the lead screw. However, the method of manually applying lubricating oil on the lead screw by workers is time-consuming and laborious, and there is a problem that it is difficult to evenly apply the lubricating oil on the lead screw. For this reason, we propose a worm and worm gear type elevator. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a worm and worm gear type elevator to solve the problems raised in the above background art.

[0006] To achieve the above object, a worm and worm gear type elevator is provided, which includes a bottom plate. Two support leg frames are fixedly connected to the bottom of the bottom plate. Above the bottom plate, there is a top plate. An elevating mechanism is arranged between the top plate and the bottom plate. The elevating mechanism is used to drive the top plate to move vertically up and down. On the upper surface of the top plate, wheel frames are symmetrically slidably arranged. A towing wheel is rotatably connected inside the wheel frame. A distance adjusting mechanism is arranged on one side of the two wheel frames. When the elevating mechanism drives the top plate to move vertically, the distance adjusting mechanism drives the two wheel frames to move horizontally synchronously in opposite directions, thereby adjusting the distance between the two wheel frames. On both sides of the bottom plate, support frames are symmetrically arranged. A displacement guiding mechanism is arranged between the support frames and the two support leg frames. When the distance adjusting mechanism drives the wheel frames to move horizontally, the displacement guiding mechanism drives the support frames to move horizontally synchronously;

[0007] The elevating mechanism includes second hinge rods symmetrically hinged to the upper surface of the bottom plate. In the middle positions on the side where the two second hinge rods are close to each other, first hinge rods are rotatably connected. The upper ends of the first hinge rods are hinged to the lower surface of the top plate. The first hinge rods and the second hinge rods are both inclined. Connecting rods are rotatably connected between the lower ends of the two first hinge rods and between the upper ends of the two second hinge rods. A pump oil mechanism is arranged on the connecting rod located below. Near the middle section of the connecting rod located above, a moving block is fixedly connected. A lead screw is threadedly connected to the side wall of the moving block. When the elevating mechanism drives the top plate to move vertically, the pump oil mechanism conveys lubricating oil to the surface of the lead screw.

[0008] As a further improvement of this technical solution, both ends of the two connecting rods respectively penetrate through the first hinge rods and the second hinge rods and are rotatably connected with rollers. Guide rails are symmetrically and fixedly connected to the upper surface of the bottom plate and the lower surface of the top plate. The four rollers are respectively slidably arranged inside the four guide rails. A worm and worm gear reducer is installed on one side of the top plate. The output shaft of the worm and worm gear reducer is coaxially fixedly connected to the lead screw. A planetary reducer is installed on one side of the worm and worm gear reducer. A servo motor is installed on one side of the planetary reducer. The output shaft of the servo motor is coaxially fixedly connected to the input shaft of the planetary reducer. The output shaft of the planetary reducer is coaxially fixedly connected to the input shaft of the worm and worm gear reducer.

[0009] As a further improvement of this technical solution, the pump oil mechanism includes an oil storage cavity opened inside the lower connecting rod. Piston rods are arranged at both ends of the oil storage cavity. The position between the two piston rods inside the oil storage cavity is set as a pressure cavity. A one-way air valve and an oil filling pipe are fixedly connected to the top of the lower connecting rod. A sealing cover is arranged at the top of the oil filling pipe. An oil delivery hose is fixedly connected to the bottom of the lower connecting rod. The oil delivery hose, the one-way air valve and the oil filling pipe are all connected to the inside of the pressure cavity. An oil injection cavity is opened inside the moving block above the lead screw. The other end of the oil delivery hose penetrates through the moving block and is connected to the inside of the oil injection cavity.

[0010] As a further improvement of the present technical solution, an inner movable groove is provided on the side wall of the lower guide rail, an outer movable groove is provided on the side wall of the support frame, and the mutually remote ends of the two piston rods penetrate through the oil storage cavity, the inner movable groove and the outer movable groove in sequence and are fixedly connected with end plates. A baffle is fixedly connected to the outer side of the piston rod, and the baffle is arranged at the position between the guide rail and the support frame.

[0011] As a further improvement of the present technical solution, the lower connecting rod is slidably arranged on the upper surface of the bottom plate, and the end plate and the baffle are respectively in close contact with both sides of the support frame.

[0012] As a further improvement of the present technical solution, the distance adjustment mechanism includes a T-shaped rod arranged on one side of the bottom plate. Dovetail tenons are fixedly connected to both ends of the horizontal section of the T-shaped rod. An external plate is fixedly connected to one side of the wheel frame. One side of the external plate is provided as an inclined surface, and an inclined chute is provided on the inclined surface of the external plate. The end of the chute close to the T-shaped rod is at a lower position, and the end of the chute far from the T-shaped rod is at a higher position. The two dovetail tenons are respectively slidably arranged inside the two chutes.

[0013] As a further improvement of the present technical solution, two jacks are provided on the side wall of the T-shaped rod. A bolt is slidably arranged inside the lower jack, and the bolt is threadedly connected to the side wall of the bottom plate.

[0014] As a further improvement of the present technical solution, the displacement guiding mechanism includes two extension rods fixedly connected to the side of the support frame close to the support leg frame. A through groove is provided on the side wall of the support leg frame. One end of the extension rod is slidably arranged inside the through groove. A spring is slidably sleeved on the outer side of the extension rod. The two ends of the spring are respectively fixedly connected to the support leg frame and the support frame. Push plates are fixedly connected to the mutually remote sides of the two wheel frames, and the lower end of the push plate extends to one side of the support frame.

[0015] As a further improvement of the present technical solution, the support frame is of an L-shaped structure. A plurality of guide wheels are rotatably connected to the bottom of the horizontal section of the support frame in a rectangular array, and the bottom ends of the guide wheels are on the same horizontal plane as the lower surface of the support leg frame.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. In the process of the top plate moving vertically upward, by sliding the dovetail tenons on both sides of the T-shaped rod along the inner walls of the two chutes to the lower positions respectively, the two external plates are pushed to move synchronously away from the T-shaped rod, thereby increasing the distance between the two wheel frames, expanding the support surface of the workpiece on the two idler wheels, and enabling the two idler wheels to convey the plate-shaped workpiece upward more stably.

[0018] 2. When the distance between the two wheel frames of this worm and worm gear lift increases, the push plate pushes the support frame to horizontally move away from the bottom plate, increasing the length of the part of the extension rod outside the through groove. The guide wheel rolls on the upper surface of the processing table, increasing the support area of the lift on the processing table, thereby improving the stability of the lift.

[0019] 3. During the process of the top plate moving vertically downward, the support frame pushes the baffle plate and the piston rod to move towards the oil delivery hose, squeezing the lubricating oil into the interior of the oil injection cavity through the oil delivery hose and applying it to the top of the lead screw. At the same time, the lead screw continues to rotate, and the moving block moves horizontally along the outer wall of the lead screw. Therefore, the position where the lead screw communicates with the oil injection cavity will change in a spiral shape, enabling the lubricating oil in the oil injection cavity to be evenly applied to the surface of the lead screw.

[0020] 4. This worm and worm gear lift uses a servo motor to drive a double reducer to accurately adjust the number of rotation turns of the lead screw, thereby accurately controlling the start and stop positions of the top plate, wheel frame, and trailing wheel. The movement is stable and the operation is simple. At the same time, the lift greatly improves the load rate. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0022] Figure 2 It is one of the schematic diagrams of the lifting mechanism structure of the present utility model;

[0023] Figure 3 It is the second schematic diagram of the lifting mechanism structure of the present utility model;

[0024] Figure 4 It is the schematic diagram of the distance adjustment mechanism structure of the present utility model;

[0025] Figure 5 It is one of the schematic diagrams of the displacement guiding mechanism structure of the present utility model;

[0026] Figure 6 It is the second schematic diagram of the displacement guiding mechanism structure of the present utility model;

[0027] Figure 7 Of the present utility model Figure 5 Enlarged view of the structure at A;

[0028] Figure 8 It is the schematic diagram of the oil pumping mechanism structure of the present utility model.

[0029] The meanings of each label in the figure are as follows:

[0030] 1. Bottom plate; 11. Support leg frame; 111. Through groove;

[0031] 2. Top plate;

[0032] 3. Lifting mechanism; 311. First hinge rod; 312. Second hinge rod; 32. Connecting rod; 33. Roller; 34. Guide rail; 341. Inner movable groove; 35. Moving block; 351. Oil injection chamber; 36. Worm and worm gear reducer; 37. Lead screw;

[0033] 4. Wheel carrier; 41. Pusher plate;

[0034] 5. Spacing adjustment mechanism; 51. T-shaped rod; 511. Insertion hole; 512. Bolt; 52. Dovetail tenon; 53. Outer plate; 54. Chute;

[0035] 6. Support frame; 61. Guide wheel; 62. Outer movable groove;

[0036] 7. Displacement guiding mechanism; 71. Extension rod; 72. Spring;

[0037] 8. Oil pumping mechanism; 81. Oil storage chamber; 82. Piston rod; 83. Baffle; 84. End plate; 86. One-way air valve; 87. Oil delivery hose; 88. Refueling pipe. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0041] Example 1

[0042] Please refer to Figure 1 As shown, a worm and worm gear type elevator is provided, including a bottom plate 1. Two support brackets 11 are fixedly connected to the bottom of the bottom plate 1. During the use of the device, the support brackets 11 are fixedly installed on the processing table through screws. Above the bottom plate 1, there is a top plate 2. An elevating mechanism 3 is arranged between the top plate 2 and the bottom plate 1. The elevating mechanism 3 is used to drive the top plate 2 to move vertically up and down. On the upper surface of the top plate 2, wheel brackets 4 are symmetrically slidably arranged. A drag wheel is rotatably connected inside the wheel bracket 4. After placing a plate-shaped workpiece with a width greater than that of the top plate 2 on the two drag wheels, the elevating mechanism 3 drives the top plate 2 to move vertically upward. After adjusting the wheel brackets 4 and the drag wheels to a predetermined height, the plate-shaped workpiece can be lifted to the predetermined height.

[0043] In order to accurately adjust the start and stop positions of the top plate 2, the wheel brackets 4 and the drag wheels, the structure of the elevating mechanism 3 is refined as follows. Refer to Figure 2 and Figure 3 , the elevating mechanism 3 includes second hinge rods 312 symmetrically hinged to the upper surface of the bottom plate 1. At the middle positions on the sides where the two second hinge rods 312 are close to each other, first hinge rods 311 are rotatably connected. The upper ends of the first hinge rods 311 are hinged to the lower surface of the top plate 2. The first hinge rods 311 and the second hinge rods 312 are both inclined. Connecting rods 32 are rotatably connected between the lower ends of the two first hinge rods 311 and between the upper ends of the two second hinge rods 312. A moving block 35 is fixedly connected to a position near the middle section of the connecting rod 32 located above. A lead screw 37 is threadedly connected to the side wall of the moving block 35. The two ends of the two connecting rods 32 respectively penetrate through the first hinge rods 311 and the second hinge rods 312 and are rotatably connected with rollers 33. Guide rails 34 are symmetrically and fixedly connected to the upper surface of the bottom plate 1 and the lower surface of the top plate 2. The four rollers 33 are respectively slidably arranged inside the four guide rails 34. The guide rails 34 are horizontally arranged to restrict the rollers 33 to only move horizontally. By accurately adjusting the number of turns of the lead screw 37 and using the threaded connection between the lead screw 37 and the moving block 35, the moving block 35 drives the upper connecting rod 32 and the two rollers 33 to move horizontally along the inner wall of the upper guide rail 34, causing the two second hinge rods 312 to rotate and move upward synchronously, jacking up the top plate 2. The upwardly moved top plate 2 drives the two first hinge rods 311 to rotate and move upward synchronously, causing the lower connecting rod 32 and the two rollers 33 to move horizontally synchronously along the inner wall of the lower guide rail 34, so as to ensure that the top plate 2 is always horizontally placed during the upward movement. Similarly, by rotating the lead screw 37 in the reverse direction, driving the two second hinge rods 312 to rotate and move downward synchronously, the top plate 2 can be moved vertically downward, achieving the effect of accurately adjusting the start and stop positions of the top plate 2, the wheel brackets 4 and the drag wheels, and meeting the requirements for the upward and downward movement of workpieces in industrial production.

[0044] To accurately adjust the number of rotation turns of the lead screw 37, a worm and worm gear reducer 36 is installed on one side of the top plate 2. The output shaft of the worm and worm gear reducer 36 is fixedly connected to the lead screw 37 coaxially. A planetary reducer is installed on one side of the worm and worm gear reducer 36, and a servo motor is installed on one side of the planetary reducer. The output shaft of the servo motor is fixedly connected to the input shaft of the planetary reducer coaxially. The output shaft of the planetary reducer is fixedly connected to the input shaft of the worm and worm gear reducer 36. After the servo motor is started, its output shaft drives the input shaft of the planetary reducer to rotate. The output shaft of the planetary reducer drives the input shaft of the worm and worm gear reducer 36 to rotate. The output shaft of the worm and worm gear reducer 36 drives the lead screw 37 to rotate. By means of the servo motor driving the double reducers, the purpose of accurately adjusting the number of rotation turns of the lead screw 37 is achieved, and further the start-stop positions of the top plate 2, the wheel frame 4 and the idler wheels are accurately controlled. The action is stable and the operation is simple, so that the load rate of the elevator is greatly improved. The servo motor can be a servo motor with the model MC-130ST-M02025, the planetary reducer can be a planetary reducer with the model PLE060-L1-5-S-2-P2-T, and the worm and worm gear reducer 36 can be a reducer with the model WPDS250-60.

[0045] When placing a relatively wide plate-shaped workpiece on the two idler wheels, if the distance between the two idler wheels is small, resulting in a small supporting surface of the plate-shaped workpiece on the two idler wheels, the stability of the plate workpiece on the two idler wheels will be poor. Furthermore, when the plate workpiece moves upward and encounters the vibration generated by the operation of the servo motor of the elevator, it is easy to fall off the idler wheels. To avoid such a situation, a distance adjustment mechanism 5 is provided on one side of the wheel frame 4. When the lifting mechanism 3 drives the top plate 2 to move vertically, the distance adjustment mechanism 5 drives the two wheel frames 4 to move horizontally synchronously in opposite directions, thereby adjusting the distance between the two wheel frames 4. When the lifting mechanism 3 drives the top plate 2 and the two wheel frames 4 to move vertically upward, the distance between the two wheel frames 4 is increased, so that the two idler wheels can convey the plate-shaped workpiece more stably and is convenient for use.

[0046] To increase the distance between the two wheel frames 4 when the top plate 2 and the two wheel frames 4 move vertically upward, the structure of the distance adjustment mechanism 5 is refined as follows. Refer to Figure 4, the distance adjustment mechanism 5 includes a T-shaped rod 51 arranged on one side of the bottom plate 1. Two jacks 511 are opened on the side wall of the T-shaped rod 51. Threaded grooves corresponding to the two jacks 511 are respectively opened on the side walls of the bottom plate 1 and the top plate 2. A bolt 512 is slidably arranged inside the lower jack 511. One end of the bolt 512 is placed inside the lower threaded groove. The bolt 512 is threadedly connected to one side of the bottom plate 1, thereby fixedly connecting the T-shaped rod 51 to the bottom plate 1. Dovetail tenons 52 are fixedly connected to both ends of the horizontal section of the T-shaped rod 51. An external plate 53 is fixedly connected to one side of the wheel carrier 4. One side of the external plate 53 is set as an inclined surface. An inclined chute 54 is opened on the inclined surface of the external plate 53. The end of the chute 54 close to the T-shaped rod 51 is at a lower position, and the end of the chute 54 far from the T-shaped rod 51 is at a higher position. The two dovetail tenons 52 are respectively slidably arranged inside the two chutes 54. When the top plate 2 moves vertically upward, the T-shaped rod 51 moves vertically downward relative to the top plate 2. The dovetail tenons 52 on both sides of the T-shaped rod 51 respectively slide along the inner walls of the two chutes 54 towards the lower position, thereby pushing the two external plates 53 to move synchronously away from the T-shaped rod 51. The external plate 53 drives the corresponding wheel carrier 4 to move synchronously, so that the two wheel carriers 4 move horizontally relative to the top plate 2, thereby increasing the distance between the two wheel carriers 4. The wheel carrier 4 drives the corresponding idler wheels to move synchronously, so that the two idler wheels can stably convey the plate-shaped workpiece. Similarly, when the top plate 2 moves downward, the dovetail tenon 52 slides along the inner wall of the chute 54 towards the higher position, thereby shortening the distance between the two wheel carriers 4 and automatically resetting the wheel carrier 4.

[0047] During the upward movement of the two idler wheels, the distance between them increases. When conveying a relatively narrow plate-shaped workpiece, when the distance between the two idler wheels gradually becomes larger and is greater than the width of the workpiece, there is a situation where the workpiece will fall off the idler wheels, resulting in the two idler wheels being unable to convey the plate-shaped workpiece. To avoid this situation, when it is not necessary to increase the distance between the two idler wheels, after unscrewing the bolt 512 from the threaded groove inside the side wall of the bottom plate 1 and pulling it out from the lower jack 511, then inserting the bolt 512 into the upper jack 511, screwing the bolt 512 into the upper threaded groove, and fixedly connecting the T-shaped rod 51 to the top plate 2, it is possible to drive the T-shaped rod 51 to move vertically synchronously when the top plate 2 moves vertically. The relative positions of the T-shaped rod 51 and the two external plates 53 remain unchanged. At the same time, the dovetail tenon 52 cooperates with the chute 54 to lock the position of the external plate 53, so that the distance between the two wheel carriers 4 will not change, enabling the two idler wheels to convey relatively narrow plate-shaped workpieces.

[0048] When placing a plate-shaped workpiece on two drag wheels, the plate-shaped workpiece exerts a downward pressure on the drag wheels. When the distance between the two drag wheels increases and the pressing forces of the workpiece on the two drag wheels are different, the pressure on one side of the lift is greater, causing the lift to drive the support leg 11 to deflect slightly. Over time, the screw connection between the support leg 11 and the processing table will become loose, resulting in a decrease in the stability of the lift. Therefore, to ensure the stability of the lift, support frames 6 are symmetrically arranged on both sides of the bottom plate 1. A number of guide wheels 61 are rotatably connected in a rectangular array at the bottom of the horizontal section of the support frame 6. The bottom ends of the guide wheels 61 are on the same horizontal plane as the lower surface of the support leg 11, that is, the guide wheels 61 are in contact with the upper surface of the processing table. A displacement guiding mechanism 7 is provided between the support frame 6 and the two support legs 11, so that the support frame 6 and the guide wheels 61 play an auxiliary supporting role for the lift, expanding the supporting area of the lift on the processing table. When a greater pressure is applied to one side of the lift, it prevents the support leg 11 from deflecting slightly, improving the stability of the lift. When the wheel frame 4 moves horizontally, the displacement guiding mechanism 7 drives the support frame 6 to move horizontally synchronously, thereby further expanding the supporting area of the lift on the processing table to improve the stability of the lifting frame.

[0049] To connect the support frame 6 and the support leg 11 and enable the support frame 6 to play an auxiliary supporting role for the lift, the structure of the displacement guiding mechanism 7 is refined as follows. Refer to Figure 5 and Figure 6 , the displacement guiding mechanism 7 includes two extension rods 71 fixedly connected to the side of the support frame 6 close to the support leg 11. A through groove 111 is formed in the side wall of the support leg 11. One end of the extension rod 71 is slidably arranged inside the through groove 111. The through groove 111 is horizontally arranged, enabling the support frame 6 to only move horizontally along the axis direction of the extension rod 71. A spring 72 is slidably sleeved outside the extension rod 71. The two ends of the spring 72 are fixedly connected to the support leg 11 and the support frame 6 respectively. If the support leg 11 deflects slightly, the support leg 11 will drive the support frame 6 to deflect synchronously through the extension rod 71. However, the guide wheels 61 at the bottom of the support frame 6 are in contact with the upper surface of the processing table, leaving no space for the support frame 6 to deflect, thereby restricting the deflection of the support leg 11 and enabling the support frame 6 to play an auxiliary supporting role for the lift.

[0050] When the wheel carrier 4 moves horizontally, to make the support frame 6 move horizontally synchronously, push plates 41 are fixedly connected to the mutually remote sides of the two wheel carriers 4. The lower end of the push plate 41 extends to one side of the support frame 6. The support frame 6 is of an L-shaped structure. The push plate 41 is in close contact with the vertical section of the support frame 6. When the top plate 2 drives the wheel carrier 4 to move vertically, the wheel carrier 4 drives the push plate 41 to move vertically synchronously. The vertically moving push plate 41 is always in close contact with the support frame 6. When the distance between the two idler wheels increases and the wheel carrier 4 moves away from the top plate 2, the push plate 41 pushes the support frame 6 to move horizontally away from the bottom plate 1, so that the length of the part of the extension rod 71 located outside the through groove 111 increases, the spring 72 is elastically stretched, and the guide wheel 61 rolls on the upper surface of the processing table, further increasing the support area of the lift on the processing table and ensuring the support effect of the support frame 6 on the lift. When the lift is in an idle state, the top plate 2 drives the wheel carrier 4 to move downward, the wheel carrier 4 moves towards the top plate 2, and the spring 72 rebounds to pull the support frame 6 to reset, thereby reducing the occupied space of the lift and facilitating the transportation and storage of the lift frame.

[0051] The lift realizes the lifting movement of the top plate 2 by rotating the lead screw 37 to drive the moving block 35 to move horizontally. To slow down the wear of the lead screw 37 and the moving block 35 and extend the service life of the lead screw 37, it is necessary to regularly apply lubricating oil to the surface of the lead screw 37 that comes into contact with the moving block 35. However, the method of manually applying lubricating oil to the lead screw 37 by workers is time-consuming and laborious, and there is a problem that it is difficult to evenly apply the lubricating oil on the lead screw 37. To solve this problem, an oil pumping mechanism 8 is provided on the lower connecting rod 32. When the lifting mechanism 3 drives the top plate 2 to move vertically, the oil pumping mechanism 8 delivers lubricating oil to the surface of the lead screw 37 to achieve automatic oil application, saving manpower and improving the oil application quality at the same time.

[0052] To enable the lift to automatically apply lubricating oil to the surface of the lead screw 37, the structure of the oil pumping mechanism 8 is refined as follows. Refer to Figure 7 and Figure 8, the oil pumping mechanism 8 includes an oil storage cavity 81 formed inside the lower connecting rod 32. At both ends of the oil storage cavity 81, there are piston rods 82. The position between the two piston rods 82 inside the oil storage cavity 81 is set as a pressure cavity, and lubricating oil is stored inside the pressure cavity. At the top of the lower connecting rod 32, a one-way air valve 86 is fixedly connected, and at the bottom of the lower connecting rod 32, an oil delivery hose 87 is fixedly connected. Both the oil delivery hose 87 and the one-way air valve 86 are connected to the inside of the pressure cavity. Inside the moving block 35, an oil injection cavity 351 is formed above the lead screw 37. The other end of the oil delivery hose 87 penetrates through the moving block 35 and is connected to the inside of the oil injection cavity 351. An inner moving groove 341 is formed on the side wall of the lower guide rail 34, and an outer moving groove 62 is formed on the side wall of the support frame 6. The two ends of the two piston rods 82 away from each other sequentially penetrate through the oil storage cavity 81, the inner moving groove 341, and the outer moving groove 62 and are fixedly connected to an end plate 84. An end block 83 is fixedly connected to the outside of the piston rod 82, and the end block 83 is arranged between the guide rail 34 and the support frame 6. The end plate 84 and the end block 83 are respectively in close contact with both sides of the support frame 6. When the push plate 41 pushes the support frame 6 to horizontally move away from the bottom plate 1, the support frame 6 pushes the end plate 84 and the piston rod 82 to move away from the oil delivery hose 87. At this time, the space of the pressure cavity expands, generating negative pressure inside the pressure cavity. External air is supplemented into the pressure cavity through the one-way air valve 86, making the air pressure inside the pressure cavity consistent with the outside. When the top plate 2 drives the wheel frame 4 to move downward, the spring 72 rebounds and pulls the support frame 6 to move toward the bottom plate 1. The support frame 6 pushes the end block 83 and the piston rod 82 to move toward the oil delivery hose 87. At this time, the space of the pressure cavity shrinks, and the air pressure inside the pressure cavity increases. The air inside the pressure cavity squeezes the lubricating oil into the oil injection cavity 351 through the oil delivery hose 87. The lubricating oil in the oil injection cavity 351 will be smeared on the top of the lead screw 37. During the process of the top plate 2 driving the wheel frame 4 to move downward, the lead screw 37 rotates continuously, and the moving block 35 also moves horizontally along the outer wall of the lead screw 37. Therefore, the position where the lead screw 37 communicates with the oil injection cavity 351 changes in a spiral shape, enabling the lubricating oil in the oil injection cavity 351 to be evenly smeared on the surface of the lead screw 37.

[0053] A fuel pipe 88 is fixedly connected to the top of the lower connecting rod 32. A sealing cover is arranged at the top of the fuel pipe 88. After the sealing cover is opened, lubricating oil can be injected into the pressure chamber through the fuel pipe 88. The lower connecting rod 32 is slidably arranged on the upper surface of the bottom plate 1 to limit the rotation of the lower connecting rod 32, so that the one-way air valve 86 is always located at the top of the lower connecting rod 32, preventing the lubricating oil in the pressure chamber from blocking the one-way air valve 86 and ensuring that the outside air can smoothly enter the pressure chamber through the one-way air valve 86. Also, the fuel pipe 88 is always located at the top of the lower connecting rod 32, facilitating the injection of lubricating oil into the pressure chamber through the fuel pipe 88. The oil delivery hose 87 is always located at the bottom of the lower connecting rod 32, ensuring that the lubricating oil in the pressure chamber can always submerge the connection between the oil delivery hose 87 and the connecting rod 32, preventing air from entering the interior of the oil delivery hose 87, which would cause the lubricating oil to not flow into the oil injection chamber 351 at a uniform speed and thus unable to be evenly applied to the surface of the lead screw 37.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all such changes and improvements fall within the scope of the present utility model claimed. The scope of protection of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A worm gear lift, comprising a base plate (1), wherein two support legs (11) are fixedly connected to the bottom of the base plate (1), characterized in that: A top plate (2) is arranged above the bottom plate (1), a lifting mechanism (3) is arranged between the top plate (2) and the bottom plate (1), the lifting mechanism (3) is used to drive the top plate (2) to move vertically up and down, a wheel frame (4) is symmetrically slidably arranged on the upper surface of the top plate (2), a tug wheel is rotatably connected inside the wheel frame (4), a distance adjustment mechanism (5) is arranged on one side of the two wheel frames (4), when the lifting mechanism (3) drives the top plate (2) to move vertically, the distance adjustment mechanism (5) drives the two wheel frames (4) to move horizontally synchronously in opposite directions, so as to adjust the distance between the two wheel frames (4), support frames (6) are symmetrically arranged on both sides of the bottom plate (1), a displacement guide mechanism (7) is arranged between the support frame (6) and the two support legs (11), when the distance adjustment mechanism (5) drives the wheel frame (4) to move horizontally, the displacement guide mechanism (7) drives the support frame (6) to move horizontally synchronously; The lifting mechanism (3) comprises a second hinge rod (312) symmetrically hinged on the upper surface of the bottom plate (1); the middle positions of the two second hinge rods (312) on the side close to each other are both rotatably connected to the first hinge rod (311); the upper end of the first hinge rod (311) is hinged to the lower surface of the top plate (2); the first hinge rod (311) and the second hinge rod (312) are both inclinedly arranged; a connecting rod (32) is rotatably connected between the lower ends of the two first hinge rods (311) and between the upper ends of the two second hinge rods (312); an oil pumping mechanism (8) is provided on the lower connecting rod (32); a moving block (35) is fixedly connected to the position of the upper connecting rod (32) near the middle section; a screw rod (37) is threadedly connected to the side wall of the moving block (35); when the lifting mechanism (3) drives the top plate (2) to move vertically, the oil pumping mechanism (8) delivers lubricating oil to the surface of the screw rod (37).

2. The worm gear elevator according to claim 1, characterized in that: The two ends of the two connecting rods (32) respectively penetrate the first hinge rod (311) and the second hinge rod (312) and are rotatably connected to rollers (33); the upper surface of the bottom plate (1) and the lower surface of the top plate (2) are symmetrically fixedly connected to guide rails (34); the four rollers (33) are respectively slidably arranged inside the four guide rails (34); a worm gear reducer (36) is installed on one side of the top plate (2); the output shaft of the worm gear reducer (36) is coaxially fixedly connected to the lead screw (37); a planetary reducer is installed on one side of the worm gear reducer (36); a servo motor is installed on one side of the planetary reducer; the output shaft of the servo motor is coaxially fixedly connected to the input shaft of the planetary reducer; and the output shaft of the planetary reducer is coaxially fixedly connected to the input shaft of the worm gear reducer (36).

3. The worm gear elevator according to claim 2, characterized in that: The oil pump mechanism (8) comprises an oil storage chamber (81) opened inside the lower connecting rod (32), piston rods (82) are arranged at both ends of the oil storage chamber (81), a position between the two piston rods (82) inside the oil storage chamber (81) is set as a pressure chamber, a one-way air valve (86) and a refueling pipe (88) are fixedly connected to the top of the lower connecting rod (32), a sealing cover is arranged on the top of the refueling pipe (88), an oil delivery hose (87) is fixedly connected to the bottom of the lower connecting rod (32), the oil delivery hose (87), the one-way air valve (86) and the refueling pipe (88) are all connected to the inside of the pressure chamber, and an oil injection chamber (351) is opened inside the moving block (35) at a position above the screw rod (37), and the other end of the oil delivery hose (87) passes through the moving block (35) and is connected to the inside of the oil injection chamber (351).

4. The worm gear elevator according to claim 3, characterized in that: An inner movable groove (341) is formed on the side wall of the guide rail (34) located below, and an outer movable groove (62) is formed on the side wall of the support frame (6). The ends of the two piston rods (82) that are away from each other successively pass through the oil storage chamber (81), the inner movable groove (341) and the outer movable groove (62) and are fixedly connected to an end plate (84). A baffle plate (83) is fixedly connected to the outer side of the piston rod (82), and the baffle plate (83) is arranged between the guide rail (34) and the support frame (6).

5. The worm gear elevator according to claim 4, characterized in that: The connecting rod (32) located below is slidably arranged on the upper surface of the bottom plate (1), and the end plate (84) and the baffle plate (83) are respectively in close contact with the two sides of the support frame (6).

6. The worm gear elevator according to claim 1, characterized in that: The distance adjustment mechanism (5) comprises a T-shaped rod (51) arranged on one side of the bottom plate (1), both ends of the horizontal section of the T-shaped rod (51) are fixedly connected with dovetail tenons (52), one side of the wheel frame (4) is fixedly connected with an external plate (53), one side of the external plate (53) is arranged as an inclined surface, and an inclined sliding groove (54) is provided on the inclined surface of the external plate (53), the end of the sliding groove (54) close to the T-shaped rod (51) is located at a low position, and the end of the sliding groove (54) away from the T-shaped rod (51) is located at a high position, and the two dovetail tenons (52) are respectively slidably arranged inside the two sliding grooves (54).

7. The worm gear elevator according to claim 6, characterized in that: The side wall of the T-shaped rod (51) is provided with two insertion holes (511), a bolt (512) is slidably arranged inside the lower insertion hole (511), and the bolt (512) is threadedly connected to the side wall of the bottom plate (1).

8. The worm gear elevator according to claim 1, characterized in that: The displacement guide mechanism (7) comprises two extension rods (71) fixedly connected to a side of the support frame (6) close to the tripod (11); a through slot (111) is provided on a side wall of the tripod (11); one end of the extension rod (71) is slidably arranged inside the through slot (111); a spring (72) is provided on a sliding sleeve outside the extension rod (71); two ends of the spring (72) are respectively fixedly connected to the tripod (11) and the support frame (6); a push plate (41) is fixedly connected to the sides of the two wheel frames (4) that are away from each other; the lower end of the push plate (41) extends to one side of the support frame (6).

9. The worm gear elevator according to claim 1, characterized in that: The support frame (6) is an L-shaped structure, and a plurality of guide wheels (61) are rotatably connected in a rectangular array at the bottom of the horizontal section of the support frame (6), and the bottom ends of the guide wheels (61) and the lower surface of the support frame (11) are located on the same horizontal plane.

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