Hub roundness detection device

Abstract

The invention discloses wheel hub roundness detection equipment which comprises a workbench, a central shaft, a horizontal rotating disc, a clamp unit used for clamping the edge of one end of a wheel hub, a portal frame, a lifting frame and a pair of horizontal moving mechanisms symmetrically assembled on the lifting frame, and the moving direction of the horizontal moving mechanisms is consistent with the radial direction of the rotating disc. A detection unit is assembled on the moving end of each group of horizontal moving mechanism, each detection unit comprises a vertical mounting arm and at least one group of detection mechanisms detachably assembled on the mounting arm, each detection mechanism comprises a digital display dial indicator of which the position is adjustable and the end part can be in contact with the side wall of the hub, and the pair of detection units are respectively positioned on the inner side and the outer side of the hub. The detection mechanisms can be installed at different positions of the installation arm to detect different positions of the inner wall or the outer wall of the hub, when different hubs are detected, the number of the detection mechanisms can be increased or decreased according to requirements, the position of the digital dial indicator can be adjusted, and practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field related to the detection of automobile wheels, and specifically, to a device for detecting the roundness of wheels. Background Art

[0002] The roundness detection of wheels is a core link in wheel manufacturing, quality control, and vehicle maintenance. Its importance is directly related to driving safety, driving experience, component life, and economic benefits. Wheels with out-of-roundness will generate periodic centrifugal forces during high-speed rotation, resulting in severe steering wheel vibration (especially obvious above 80 km / h). In severe cases, it may cause body resonance and affect the steering control accuracy. Poor roundness leads to improper bead sealing, which may cause slow air leakage or abnormal tire pressure fluctuations, increasing the risk of tire blowout.

[0003] The patent document "An Automobile Wheel Roundness Detection Device" with the Chinese application number CN202321605853.9 discloses an automobile wheel roundness detection device. By rotating and adjusting the adjusting screw two, the movement of the dial indicator is controlled to achieve the effect of detecting the roundness of automobile wheels of different sizes and specifications, making the applicability of the present utility model more comprehensive and further improving its detection efficiency. However, the above patent still has the following deficiencies: only one dial indicator is used to detect the roundness of one position of the wheel, the height position of the detection point is fixed, and the practicality is low. Moreover, due to different specific processing technologies during the manufacturing process of different models of wheels, the positions prone to roundness deviation are also different. The above device cannot adjust the position of the dial indicator according to actual needs. Therefore, a device for detecting the roundness of wheels needs to be designed. Summary of the Invention

[0004] Aiming at the above technical problems, the purpose of the present invention is to overcome the problems in the prior art that there are few detection points and the height of the detection points is fixed and cannot be adjusted when detecting wheels.

[0005] To achieve the above purpose, the present invention provides a device for detecting the roundness of wheels, including: a workbench, a vertical central axis rotatably assembled on the workbench, a horizontal turntable coaxially assembled on the top of the central axis, a fixture unit assembled on the turntable for clamping the edge of one end of the wheel, a gantry assembled on the workbench, a lifting frame movably assembled up and down on the gantry, and a pair of horizontally moving mechanisms symmetrically assembled on the lifting frame; The moving direction of the horizontally moving mechanism is consistent with the radial direction of the turntable. A detection unit is assembled on the moving end of each horizontally moving mechanism. The detection unit includes a vertical mounting arm and at least one set of detection mechanisms detachably assembled on the mounting arm. The detection mechanism includes a digital display dial indicator with adjustable position and an end that can contact the side wall of the wheel. A pair of detection units are respectively located inside and outside the wheel.

[0006] Preferably, the mounting arm includes a pair of vertical connecting arms arranged at intervals in a horizontal direction perpendicular to the moving direction of the moving end of the horizontal moving mechanism. The ends of the connecting arms are connected to the ends of the other connecting arm through connecting parts. A vertical first strip-shaped through groove is penetrated through the side wall of the connecting arm opposite to the other connecting arm. The detection mechanism further includes a pair of mounting blocks respectively detachably assembled on the corresponding first strip-shaped through grooves, a connecting sleeve rotatably connected to the pair of mounting blocks, an adjusting arm slidably passing through the connecting sleeve, a locking member assembled on the connecting sleeve and detachably connected to the adjusting arm, and a first mounting bracket assembled at one end of the adjusting arm close to the hub. The digital display micrometer is assembled on the first mounting bracket.

[0007] Preferably, a second strip-shaped through groove in the same length direction is penetrated through the upper surface of the adjusting arm, and a stepped groove communicating with the second strip-shaped through groove is recessed on the upper surface of the adjusting arm. The locking member includes a first locking bolt passing upward through the bottom of the connecting sleeve and the second strip-shaped through groove, and a nut threadedly sleeved on the top of the first locking bolt and capable of being clamped into the stepped groove.

[0008] Preferably, a horizontal rotating shaft rotatably connected to the mounting block is fixedly connected to one side of the connecting sleeve opposite to the mounting block. The length direction of the rotating shaft is perpendicular to the moving direction of the moving end of the horizontal moving mechanism. A second locking bolt with an end capable of abutting against the outer wall of the rotating shaft is threadedly connected to the mounting block.

[0009] Preferably, the mounting block includes a first sub-block in close contact with the side of the connecting arm away from the other connecting arm and a second sub-block in close contact with the side of the connecting arm close to the other connecting arm. A convex block portion capable of being clamped into the first strip-shaped through groove protrudes from the first sub-block. The first sub-block is fixedly connected to the second sub-block through a plurality of mounting bolts. At least one third locking bolt with an end capable of abutting against the connecting arm is threadedly connected to the first sub-block.

[0010] Preferably, a second mounting bracket is assembled on the lower surface of the workbench. The central shaft passes downward through the workbench and is axially connected to the second mounting bracket. A first motor with an output shaft drivingly connected to the lower end of the central shaft is assembled on the second mounting bracket. The fixture unit includes a rotating sleeve assembled on the outer wall of the central shaft through a plurality of bearings, a horizontal adjusting plate fixedly connected to the upper end of the rotating sleeve, a third mounting bracket fixedly assembled on the central shaft and located below the rotating sleeve, a horizontal first electric push rod hinged to the third mounting bracket and with a moving end hinged to the lower end of the rotating sleeve, and at least three fixtures arranged at intervals in the circumferential direction of the turntable and all slidably connected to the turntable along the corresponding radial direction of the turntable. The rotating sleeve is assembled on the workbench through the first shaft seat. The fixture passes upward through the turntable. At least three arc-shaped through grooves matching the fixture are arranged through the adjusting plate along the offset axis. A guide wheel is assembled at the bottom of the fixture and slidably inserted into the corresponding arc-shaped through groove.

[0011] Preferably, the horizontal movement mechanism includes a slider fixedly connected to the upper end of the mounting arm and slidably connected to the lifting frame, a threaded rod assembled on the lifting frame through at least two second shaft seats and threaded through the slider, and a second motor assembled on the lifting frame with an output shaft drivingly connected to the end of the threaded rod.

[0012] Preferably, a plurality of vertical guide rods are fixedly connected to the lifting frame and slid upward through the top of the gantry. A vertical second electric push rod with a mobile end fixedly connected to the lifting frame is assembled at the top of the gantry.

[0013] According to the above technical solution, a hub roundness detection device provided by the present invention has the following beneficial technical effects compared with the prior art: First, a detection mechanism can be installed at different positions of the mounting arm to detect different positions on the inner wall or outer wall of the hub, and can be adjusted according to actual use requirements. When continuously detecting hubs of the same model, only the position of the digital display micrometer needs to be adjusted once, and the roundness of hubs of the same model can be continuously detected, with high efficiency and convenient use. Second, when detecting different hubs, the number of detection mechanisms can be increased or decreased according to requirements, and the position of the digital display micrometer can be adjusted. It has strong practicability and can detect the roundness of hubs of different models. Third, a pair of detection units can respectively detect the roundness of the inner wall and outer wall of the hub, with stronger practicability, which can avoid mutual congestion during the assembly of the detection mechanism, and can also increase the applicability of the device and improve the range of detectable positions.

[0014] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation part; and parts not involved in the present invention are the same as the prior art or can be implemented using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification, and are used together with the following specific implementation to explain the present invention, but do not constitute a limitation to the present invention. In the drawings: Figure 1 is a three-dimensional structural schematic diagram of a hub roundness detection device provided by the present invention; Figure 2 is a partial three-dimensional structural schematic diagram of a hub roundness detection device provided by the present invention Figure 1 ; Figure 3 It is a partial three - dimensional structure schematic diagram of a wheel hub roundness detection device provided by the present invention Figure 2 ; Figure 4 It is a three - dimensional structure schematic diagram of the detection mechanism of a wheel hub roundness detection device provided by the present invention; Figure 5 It is a partial three - dimensional structure schematic diagram of a wheel hub roundness detection device provided by the present invention Figure 3 。

[0016] Explanation of reference numerals 1, workbench; 2, central shaft; 3, turntable; 4, gantry; 5, lifting frame; 6, mounting arm; 7, digital display micrometer; 8, first strip - shaped through - slot; 9, mounting block; 10, connecting sleeve; 11, adjusting arm; 12, first mounting frame; 13, second strip - shaped through - slot; 14, stepped groove; 15, first locking bolt; 16, nut; 17, rotating shaft; 18, second locking bolt; 19, third locking bolt; 20, second mounting frame; 21, first motor; 22, rotating sleeve; 23, adjusting plate; 24, third mounting frame; 25, first electric push rod; 26, fixture; 27, arc - shaped through - slot; 28, slider; 29, threaded rod; 30, second motor; 31, guide rod; 32, second electric push rod. Detailed implementation manners

[0017] The following will explain in detail the specific implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described here are only for explaining and interpreting the present invention, and are not used to limit the present invention.

[0018] In the present invention, unless otherwise stated, the orientation words such as "up, down, inside, outside" included in the terms only represent the orientation of the terms in the normal use state, or the common names understood by those skilled in the art, and should not be regarded as a limitation to the terms.

[0019] As Figures 1-5 shown, a wheel hub roundness detection device includes: a workbench 1, a vertical central shaft 2 rotatably assembled on the workbench 1, a horizontal turntable 3 coaxially assembled on the top of the central shaft 2, a fixture unit assembled on the [unclear word, should be something like the relevant part] for clamping the edge of one end of the wheel hub, a gantry 4 assembled on the workbench 1, a lifting frame 5 that can be moved up and down and assembled on the gantry 4, and a pair of horizontally moving mechanisms symmetrically assembled on the lifting frame 5; The moving direction of the horizontal moving mechanism is consistent with the radial direction of the turntable 3. A detection unit is assembled on the moving end of each group of horizontal moving mechanisms. The detection unit includes a vertical mounting arm 6 and at least one group of detection mechanisms detachably assembled on the mounting arm 6. The detection mechanism includes a digital display micrometer 7 with adjustable position and an end that can contact the side wall of the hub. A pair of detection units are respectively located inside and outside the hub.

[0020] In the above technical solution, when detecting the hub, the hub is placed on the turntable 3, and the spokes in the hub are arranged downward. The hub is fixed by the fixture unit so that the hub and the turntable 3 are coaxially arranged; the lifting frame 5 moves downward, and one of the detection units will extend into the inside of the hub. The horizontal moving mechanism then drives the corresponding detection unit to move close to the side wall of the hub, so that the end of the digital display micrometer 7 contacts the side wall of the hub; the central shaft 2 rotates to drive the hub to rotate, and the digital display micrometer 7 will measure the roundness of the corresponding position of the hub, and judge whether it is qualified through the roundness tolerance. The detection mechanism can be installed at different positions on the mounting arm 6 to detect different positions on the inner wall or outer wall of the hub, and can be adjusted according to actual use requirements; when continuously detecting hubs of the same model, only the position of the digital display micrometer 7 needs to be adjusted once, and the roundness of hubs of the same model can be continuously detected, with high efficiency and convenient use; when detecting different hubs, the number of detection mechanisms can be increased or decreased according to requirements, and the position of the digital display micrometer 7 can be adjusted, with strong practicability and the ability to detect the roundness of different models of hubs. A pair of detection units can detect the roundness of the inner wall and outer wall of the hub respectively, with stronger practicability. Because when the two detection positions are close, the two groups of detection mechanisms assembled on one mounting arm 6 will interfere with each other. When assembled on a pair of mounting arms 6 respectively, it can avoid the mutual congestion during the assembly of the detection mechanisms, and at the same time can increase the applicability of the device and improve the detectable position range. The digital display micrometer 7 can be connected to the terminal through a data cable to draw detection charts and save data.

[0021] In a preferred embodiment of the present invention, the mounting arm 6 includes a pair of vertical connecting arms spaced apart in the horizontal direction perpendicular to the moving direction of the moving end of the horizontal moving mechanism. The ends of the connecting arms are connected to the ends of the other connecting arm through connecting parts. A vertical first strip-shaped through groove 8 is provided through the side walls of the connecting arm and the other connecting arm facing each other. The detection mechanism further includes a pair of mounting blocks 9 respectively detachably assembled on the corresponding first strip-shaped through slots 8, a connecting sleeve 10 rotatably connected to the pair of mounting blocks 9, an adjusting arm 11 slidably passing through the connecting sleeve 10, a locking member assembled on the connecting sleeve 10 and detachably connected to the adjusting arm 11, and a first mounting bracket 12 assembled at one end of the adjusting arm 11 close to the hub. The digital display micrometer 7 is assembled on the first mounting bracket 12.

[0022] In the above technical solution, when the position of the digital display micrometer 7 needs to be adjusted, loosen the locking member, and the adjusting arm 11 can slide on the connecting sleeve 10 to adjust the distance between the digital display micrometer 7 and the hub; and the connecting sleeve 10 can rotate on the mounting block 9 to adjust the tilt angle. Through the cooperation of the two, the adjustment is more convenient and fast.

[0023] In a preferred embodiment of the present invention, a second strip-shaped through slot 13 is provided through the upper surface of the adjusting arm 11 in the same length direction, and a stepped groove 14 communicating with the second strip-shaped through slot 13 is recessed on the upper surface of the adjusting arm 11; The locking member includes a first locking bolt 15 passing upward through the bottom of the connecting sleeve 10 and the second strip-shaped through slot 13, and a nut 16 threadedly sleeved on the top of the first locking bolt 15 and capable of being clamped into the stepped groove 14.

[0024] In the above technical solution, since the nut 16 is clamped into the stepped groove 14, rotating the first locking bolt 15 can increase the distance between the nut 16 and the head of the first locking bolt 15, and the adjusting arm 11 can slide within the connecting sleeve 10; then tighten the first locking bolt 15 so that the nut 16 tightly presses on the adjusting arm 11.

[0025] In a preferred embodiment of the present invention, a horizontal rotating shaft 17 rotatably connected to the mounting block 9 is fixedly connected to one side of the connecting sleeve 10 opposite to the mounting block 9. The length direction of the rotating shaft 17 is perpendicular to the moving direction of the moving end of the horizontal moving mechanism. A second locking bolt 18 whose end can abut against the outer wall of the rotating shaft 17 is threadedly connected to the mounting block 9.

[0026] In the above technical solution, loosen the second locking bolt 18, and the rotating shaft 17 can rotate, thereby adjusting the tilt angle of the digital display micrometer 7; then tighten the second locking bolt 18 so that its end tightly abuts against the rotating shaft 17.

[0027] In a preferred embodiment of the present invention, the mounting block 9 includes a first sub-block in close contact with one side of the connecting arm away from the other connecting arm and a second sub-block in close contact with one side of the connecting arm close to the other connecting arm; The first sub-block is provided with a convex block portion that can be snapped into the first strip-shaped through groove 8. The first sub-block is fixedly connected to the second sub-block by a plurality of mounting bolts. At least one third locking bolt 19 with an end that can abut against the connecting arm is threadedly connected to the first sub-block.

[0028] In the above technical solution, by loosening the plurality of mounting bolts, the first sub-block and the second sub-block can be disassembled, and the mounting arm 6 can be removed from the connecting arm. When reassembling, the convex block portion is inserted into the first strip-shaped through groove 8, and the first sub-block and the second sub-block are connected together by a plurality of mounting bolts, thus assembling the mounting block 9 on the first strip-shaped through groove 8, and the operation is simple and convenient.

[0029] In a preferred embodiment of the present invention, a second mounting frame 20 is assembled on the lower surface of the workbench 1. The central shaft 2 passes downward through the workbench 1 and is pivotally connected to the second mounting frame 20. A first motor 21 with an output shaft drivingly connected to the lower end of the central shaft 2 is assembled on the second mounting frame 20; The clamping unit includes a rotating sleeve 22 assembled on the outer wall of the central shaft 2 through a plurality of bearings, a horizontal adjusting plate 23 fixedly connected to the upper end of the rotating sleeve 22, a third mounting frame 24 fixedly assembled on the central shaft 2 and located below the rotating sleeve 22, a horizontal first electric push rod 25 hinged to the third mounting frame 24 and with its moving end hinged to the lower end of the rotating sleeve 22, and at least three clamps 26 spaced along the circumferential direction of the turntable 3 and all slidingly connected to the turntable 3 along the corresponding radial direction of the turntable 3; The rotating sleeve 22 is assembled on the workbench 1 through a first shaft seat. The clamp 26 passes upward through the turntable 3. At least three arc-shaped through grooves 27 matching the clamps 26 are penetratingly provided on the adjusting plate 23 off the axis. A guide wheel slidably inserted into the corresponding arc-shaped through groove 27 is assembled at the bottom of the clamp 26.

[0030] In the above technical solution, when the first motor 21 rotates, it drives the rotation through the central shaft 2, thereby driving the hub on the turntable 3 to rotate. After placing the hub on the turntable 3, the first electric push rod 25 drives the rotating sleeve 22 to rotate, thereby driving the adjusting plate 23 to rotate. Through the cooperation of the arc-shaped through groove 27 and the guide wheel, a plurality of clamps 26 are driven to gather close to the center of the turntable 3 to clamp the hub.

[0031] In a preferred embodiment of the present invention, the horizontal moving mechanism includes a slider 28 fixedly connected to the upper end of the mounting arm 6 and slidably connected to the lifting frame 5, a threaded rod 29 assembled on the lifting frame 5 through at least two second shaft seats and threadedly passing through the slider 28, and a second motor 30 assembled on the lifting frame 5 and with its output shaft drivingly connected to the end of the threaded rod 29.

[0032] In the above technical solution, when the second motor 30 drives the threaded rod 29 to rotate, the slider 28 can be driven to slide horizontally on the lifting frame 5, thereby driving the digital micrometer 7 to move closer to or away from the hub.

[0033] In a preferred embodiment of the present invention, a plurality of vertical guide rods 31 that slide upward through the top of the gantry 4 are fixedly connected to the lifting frame 5, and a vertical second electric push rod 32 with a mobile end fixedly connected to the lifting frame 5 is assembled at the top of the gantry 4. The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0034] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0035] Furthermore, any combination can be made between different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A hub roundness detection device, characterized in that, Comprising: A workbench (1), a vertical central axis (2) rotatably assembled on the workbench (1), a horizontal turntable (3) coaxially assembled on the top of the central axis (2), a fixture unit assembled on the assembly for clamping the edge of one end of the hub, a gantry (4) assembled on the workbench (1), a lifting frame (5) movably assembled up and down on the gantry (4), and a pair of horizontally moving mechanisms symmetrically assembled on the lifting frame (5); The moving direction of the horizontally moving mechanism is the same as the radial direction of the turntable (3). A detection unit is assembled on the moving end of each group of horizontally moving mechanisms. The detection unit includes a vertical mounting arm (6) and at least one group of detection mechanisms detachably assembled on the mounting arm (6). The detection mechanism includes a digital display micrometer (7) with adjustable position and an end that can contact the side wall of the hub. A pair of detection units are respectively located inside and outside the hub.

2. The hub roundness detection device according to claim 1, wherein The mounting arm (6) includes a pair of vertical connecting arms spaced horizontally along a direction perpendicular to the moving direction of the moving end of the horizontally moving mechanism. The ends of the connecting arms are connected to the ends of the other connecting arm through connecting parts. A vertical first elongated through slot (8) is penetrated through the side wall of the connecting arm opposite to the other connecting arm; The detection mechanism further includes a pair of mounting blocks (9) respectively detachably assembled on the corresponding first elongated through slot (8), a connecting sleeve (10) rotatably connected to the pair of mounting blocks (9), an adjusting arm (11) slidably passing through the connecting sleeve (10), a locking member assembled on the connecting sleeve (10) and detachably connected to the adjusting arm (11), and a first mounting bracket (12) assembled on the end of the adjusting arm (11) close to the hub. The digital display micrometer (7) is assembled on the first mounting bracket (12).

3. The hub roundness detection device according to claim 2, characterized in that, A second elongated through slot (13) with the same length direction is penetrated through the upper surface of the adjusting arm (11). A stepped groove (14) communicating with the second elongated through slot (13) is recessed on the upper surface of the adjusting arm (11); The locking member includes a first locking bolt (15) passing upward through the bottom of the connecting sleeve (10) and the second elongated through slot (13), and a nut (16) threadedly sleeved on the top of the first locking bolt (15) and capable of being clamped into the stepped groove (14).

4. A hub roundness detection device according to claim 2, characterized in that, A horizontal rotating shaft (17) rotatably connected to the mounting block (9) is fixedly connected to the side of the connecting sleeve (10) opposite to the mounting block (9). The length direction of the rotating shaft (17) is perpendicular to the moving direction of the moving end of the horizontally moving mechanism. A second locking bolt (18) with an end capable of abutting against the outer wall of the rotating shaft (17) is threadedly connected to the mounting block (9).

5. The hub roundness detection device according to claim 2, characterized in that, The mounting block (9) includes a first sub-block in close contact with the side of the connecting arm away from the other connecting arm and a second sub-block in close contact with the side of the connecting arm close to the other connecting arm; A convex block portion capable of being inserted into the first elongated through slot (8) is protruded on the first sub-block. The first sub-block is fixedly connected to the second sub-block through a plurality of mounting bolts. At least one third locking bolt (19) with an end capable of abutting against the connecting arm is threadedly connected to the first sub-block.

6. The hub roundness detection device according to claim 1, characterized in that, The lower surface of the workbench (1) is equipped with a second mounting bracket (20). The central shaft (2) passes downward through the workbench (1) and is pivotally connected to the second mounting bracket (20). A first motor (21) with an output shaft drivingly connected to the lower end of the central shaft (2) is mounted on the second mounting bracket (20). The fixture unit includes a rotating sleeve (22) assembled on the outer wall of the central shaft (2) through a plurality of bearings, a horizontal adjusting plate (23) fixedly connected to the upper end of the rotating sleeve (22), a third mounting bracket (24) fixedly mounted on the central shaft (2) and located below the rotating sleeve (22), a horizontal first electric push rod (25) hinged to the third mounting bracket (24) and with its moving end hinged to the lower end of the rotating sleeve (22), and at least three clamps (26) spaced along the circumferential direction of the turntable (3) and all slidably connected to the turntable (3) along the corresponding radial direction of the turntable (3). The rotating sleeve (22) is assembled on the workbench (1) through a first shaft seat. The clamp (26) passes upward through the turntable (3). At least three arc-shaped through grooves (27) matching the clamps (26) are arranged through the adjusting plate (23) in a direction deviating from the axis. Guide wheels slidably inserted into the corresponding arc-shaped through grooves (27) are mounted at the bottom of the clamp (26).

7. The roundness detection device for a wheel hub according to claim 1, wherein The horizontal movement mechanism includes a slider (28) fixedly connected to the upper end of the mounting arm (6) and slidably connected to the lifting frame (5), a threaded rod (29) assembled on the lifting frame (5) through at least two second shaft seats and threadedly passing through the slider (28), and a second motor (30) mounted on the lifting frame (5) with its output shaft drivingly connected to the end of the threaded rod (29).

8. The hub roundness detection device according to claim 1, characterized in that A plurality of vertical guide rods (31) are fixedly connected to the lifting frame (5) and slide upward through the top of the gantry (4). A vertical second electric push rod (32) with its moving end fixedly connected to the lifting frame (5) is mounted on the top of the gantry (4).

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