CN218974482U

CN218974482U - High-efficient accurate terminal block function check out test set

Info

Publication number: CN218974482U
Application number: CN202223055235.XU
Authority: CN
Inventors: 张玉强
Original assignee: Shenzhen Qitai Automation Equipment Co ltd
Current assignee: Shenzhen Qitai Automation Equipment Co ltd
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2023-05-05
Anticipated expiration: 2032-11-17

Abstract

The utility model relates to the technical field of terminal block detection, in particular to efficient and accurate terminal block function detection equipment. The utility model provides high-efficiency accurate terminal block function detection equipment which comprises a base, a working platform, a first fixing seat, a screw rod, a sliding block and the like, wherein the base is provided with a first fixing seat; the working platform is arranged on the base, first fixing seats are symmetrically arranged on one side of the base, screw rods are rotationally connected between the first fixing seats, and the screw rods penetrate through sliding blocks arranged on the base in a threaded mode. The electric sliding block transversely moves along the fourth sliding groove, the electric sliding block drives the second guide rod and the detection needles on the second guide rod to transversely move, and the front detection needles and the rear detection needles can longitudinally move along the second guide rod, so that the distance between the front detection needles and the rear detection needles is flexibly adjusted according to the specification of the terminal table and the distance between the terminals on the terminal table, the distance between the detection needles is flexibly adjusted according to the detection requirement of the terminal table, and the accurate and efficient detection of the terminal table is achieved.

Description

High-efficient accurate terminal block function check out test set

Technical Field

The utility model relates to the technical field of terminal block detection, in particular to efficient and accurate terminal block function detection equipment.

Background

The connection terminal is an accessory product for realizing electrical connection, and is industrially divided into the category of connectors. In the electrical connection, a plurality of connecting terminals are needed, so that a terminal block is formed after the connecting terminals are spliced.

When the terminal block is required to be subjected to quality detection or function detection before delivery, and mass production of the terminal block in industry is carried out, most manufacturers select manual sampling detection or adopt automatic detection equipment to detect the function of the terminal block, and the detection accuracy is low in a sampling detection mode, so that the quality yield of products cannot be effectively ensured; when the automatic detection equipment is used for detecting the terminal blocks, the detection probes of the detection equipment are usually fixedly arranged, and the spacing of the detection terminals cannot be flexibly adjusted according to the spacing of the terminals on different terminal blocks, so that the detection probes corresponding to the terminal blocks need to be replaced according to the spacing between the terminals of different terminal blocks; secondly, the existing detection equipment also does not have an automatic feeding and discharging structure.

Therefore, it is necessary to design a high-efficiency and accurate terminal block function detection device which can adjust the distance between detection probes according to detection requirements and has automatic feeding and discharging functions.

Disclosure of Invention

The utility model aims to overcome the defects that the detection accuracy of manual spot check is low or the distance between detection probes of automatic detection equipment cannot be adjusted according to detection needs or the automatic feeding and discharging functions are lacked in the prior art, and the technical problem to be solved is to provide the high-efficiency and accurate terminal table function detection equipment which can adjust the distance between the detection probes according to needs and has the automatic feeding and discharging functions.

In order to solve the technical problems, the utility model provides high-efficiency and accurate terminal table function detection equipment which comprises a base, a working platform, a first fixed seat, a screw rod, a motor, sliding blocks, a moving assembly, a detection assembly, a clamping assembly, a feeding assembly and a discharging assembly, wherein the working platform is arranged on the base, one side of the base is symmetrically provided with the first fixed seat, the screw rod is rotationally connected between the first fixed seats, the screw rod penetrates through the sliding blocks arranged on the base in a sliding manner in a threaded manner, one end of the screw rod is connected with an output shaft of the motor arranged on the base, the sliding blocks are in sliding fit with the outer wall of one side of the working platform, the sliding blocks are connected with the detection assembly for carrying out high-efficiency and accurate detection on a terminal table through the moving assembly, the clamping assembly for clamping and fixing a workpiece to be detected and the discharging assembly for carrying out discharging the workpiece to be detected are arranged on the working platform, and the feeding assembly for carrying out automatic feeding on the workpiece to be detected is arranged on the side opposite to the sliding blocks.

Preferably, the moving assembly comprises a first guide rod, an electric telescopic rod and a mounting plate, a vertical third sliding groove is formed in the sliding block, the first guide rod is arranged in the third sliding groove, the electric telescopic rod is connected to the first guide rod in a sliding mode, the electric telescopic rod is matched with the third sliding groove and can slide up and down in the third sliding groove, and one end, far away from the third sliding groove, of the electric telescopic rod is connected with the mounting plate.

Preferably, the detection assembly comprises an electric sliding block, a detection needle, a second guide rod and a third guide rod, a fourth sliding groove parallel to the length direction of the mounting plate is symmetrically formed in the bottom of the mounting plate, the third guide rod is arranged in the fourth sliding groove, the electric sliding block which is matched with the fourth sliding groove and can horizontally slide in the fourth sliding groove is connected to the third guide rod in a sliding mode, a second guide rod perpendicular to the third guide rod is connected to one opposite side of the lower portion of the symmetrical electric sliding block, and the detection needle used for carrying out function detection on the terminal table is connected to the second guide rod in a sliding mode.

Preferably, the clamping assembly comprises an electric clamping plate, fourth guide rods and springs, the working platform is provided with weft first sliding grooves in a pairwise symmetrical mode, the fourth guide rods are arranged in the first sliding grooves, the electric clamping plates are connected between the fourth guide rods adjacent in the warp direction together, the bottom ends of the electric clamping plates can slide in the first sliding grooves, the springs are arranged between the electric clamping plates and the groove walls of the first sliding grooves, which are close to the outer sides of the working platform, and the springs are wound on the fourth guide rods.

Preferably, the discharging assembly comprises an electric discharging push plate and a fifth guide rod, a weft second chute is formed in the center line of the working platform, the fifth guide rod is arranged in the second chute, the electric discharging push plate is connected to the fifth guide rod in a sliding mode, and the bottom end of the electric discharging push plate slides in the second chute.

Preferably, the feeding assembly comprises a second fixing seat, a conveyor belt, a fixing rod, an electric feeding push plate and a sliding rod, wherein the second fixing seat is arranged on one side, opposite to the sliding block, of the base, the conveyor belt is rotatably arranged between two ends of the warp direction of the second fixing seat, the height of the conveyor belt is consistent with that of the working platform, the fixing rod is symmetrically arranged on the second fixing seat, the fixing rod is parallel to the width direction of the second fixing seat, a symmetrical feeding sliding groove is formed in the upper portion of one side, opposite to the fixing rod, of the fixing rod, a sliding rod which is matched with the fixing rod and can slide along the warp direction of the feeding sliding groove is arranged in the feeding sliding groove, the bottom of the symmetrical sliding rod is jointly connected with the electric feeding push plate, and the electric feeding push plate is in sliding fit with the conveyor belt when moving in the warp direction.

Preferably, the automatic feeding device further comprises a telescopic stop lever, wherein one side, far away from the working platform, of the second fixing seat is connected with the telescopic stop lever, and the telescopic stop lever is connected with one side of the electric feeding push plate.

Preferably, the lamp also comprises a glass cover and an illuminating lamp, and the bottom of the mounting plate is connected with the illuminating lamp for assisting illumination and the glass cover for providing protection for the illuminating lamp.

Preferably, the dust-proof device further comprises a dust-proof cover, and the working platform is connected with the dust-proof cover for dust prevention.

In summary, the utility model has the following beneficial effects:

1. the electric sliding block transversely moves along the fourth sliding groove, the electric sliding block drives the second guide rod and the detection needles on the second guide rod to transversely move, and the front detection needles and the rear detection needles can longitudinally move along the second guide rod, so that the distance between the front detection needles and the rear detection needles is flexibly adjusted according to the specification of the terminal table and the distance between the terminals on the terminal table, the distance between the detection needles is flexibly adjusted according to the detection requirement of the terminal table, and the accurate and efficient detection of the terminal table is realized;

2. the electric feeding push plate pushes the terminal block to be detected on the conveyor belt to the working platform through the backward sliding fit of the sliding rod and the feeding chute, so that the automatic feeding function of the electric feeding push plate is realized;

3. the electric discharging push plate moves forwards along the second sliding groove, so that the terminal block which is detected is pushed onto the conveying belt, the terminal block which is detected is conveyed to a designated position through the conveying belt, and the automatic discharging function is realized through the electric discharging push plate.

Drawings

Fig. 1 is a schematic perspective view of the components of the base, the working platform, the sliding block and the like.

Fig. 2 is a perspective view of a mounting plate of the present utility model.

Fig. 3 is an enlarged view of fig. 2 at a in accordance with the present utility model.

Fig. 4 is a schematic perspective view of the electric telescopic rod, the mounting plate and the sliding block according to the present utility model.

Fig. 5 is a schematic perspective view of the parts such as the electric clamping plate, the fourth guide rod and the spring.

Fig. 6 is a schematic perspective view of the components such as the conveyor belt, the fixed rod and the electric feeding push plate.

Fig. 7 is a schematic perspective view of the present utility model.

The marks in the drawings are: the device comprises a base, a first fixing seat, a 2-working platform, a 201-first chute, a 202-second chute, a 3-screw rod, a 4-motor, a 5-sliding block, a 501-third chute, a 502-first guide rod, a 6-electric telescopic rod, a 7-mounting plate, a 701-fourth chute, a 8-electric sliding block, a 801-detection needle, a 802-second guide rod, a 9-third guide rod, a 10-glass cover, a 11-illuminating lamp, a 12-feeding chute, a 13-electric clamping plate, a 14-fourth guide rod, a 15-spring, a 16-electric discharging push plate, a 17-fifth guide rod, a 18-second fixing seat, a 19-conveyor belt, a 20-fixing rod, a 21-electric feeding push plate, a 2101-sliding rod, a 2102-telescopic stop rod and a 22-dust cover.

Detailed Description

In the description of the present utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model is further described below with reference to the drawings and examples.

Example 1

As shown in fig. 1 and 2, a high-efficient accurate terminal platform function test equipment, including base 1, work platform 2, first fixing base 101, the screw rod 3, motor 4, sliding block 5, remove the subassembly, detect the subassembly, clamping assembly, material loading subassembly and unloading subassembly, work platform 2 installs on base 1 through bolted connection's mode, first fixing base 101 is installed to 1 top rear side bilateral symmetry, be connected with screw rod 3 between the first fixing base 101, screw rod 3 runs through sliding type ground and sets up the sliding block 5 on base 1 with the screw thread, the right-hand member of screw rod 3 and the output shaft of motor 4 through the bolt installation on base 1, motor 4 is servo motor, sliding block 5 front portion and the outer wall sliding fit of work platform 2 rear side, be connected with the detection subassembly that is used for carrying out high-efficient accurate detection to the terminal platform through removing the subassembly on the sliding block 5, be provided with on the work platform 2 be used for treating the fixed clamping subassembly of work piece of examining and to accomplish the unloading subassembly that the work piece of detecting, be provided with the automatic material loading subassembly that is used for waiting to examine the work piece on the side opposite to be provided with sliding block 5.

As shown in fig. 2, the moving assembly includes a first guide rod 502, an electric telescopic rod 6 and a mounting plate 7, a vertical third chute 501 is formed on the sliding block 5, the first guide rod 502 is disposed in the third chute 501, the electric telescopic rod 6 is slidably connected to the first guide rod 502, the first guide rod 502 penetrates through the rear portion of the electric telescopic rod 6, the electric telescopic rod 6 is adapted to the third chute 501 and can slide up and down in the third chute 501, and the front end of the electric telescopic rod 6 is connected with the mounting plate 7.

As shown in fig. 2, 3 and 4, the detection assembly comprises an electric slide 8, a detection needle 801, a second guide rod 802 and a third guide rod 9, a transverse fourth chute 701 is symmetrically formed in front and back of the bottom of the mounting plate 7, the third guide rod 9 is arranged in the fourth chute 701, the electric slide 8 which is matched with the fourth chute 701 and can horizontally slide in the fourth chute 701 is slidably connected to the third guide rod 9, a second guide rod 802 perpendicular to the third guide rod 9 is connected to opposite sides of the lower part of the front and back symmetrical electric slide 8, and the detection needle 801 for detecting functions of the terminal stand is slidably connected to the second guide rod 802.

As shown in fig. 5, the clamping assembly includes an electric clamping plate 13, a fourth guide rod 14 and a spring 15, weft first sliding grooves 201 are symmetrically formed in the working platform 2 in pairs, the fourth guide rod 14 is arranged in the first sliding grooves 201, the electric clamping plate 13 is connected between the fourth guide rods 14 adjacent in the warp direction, the bottom end of the electric clamping plate 13 can slide in the first sliding grooves 201, the spring 15 is arranged between the electric clamping plate 13 and the groove wall of the first sliding groove 201, which is close to the outer side of the working platform 2, and the spring 15 is wound on the fourth guide rod 14.

As shown in fig. 6 and 7, the feeding assembly comprises a second fixing seat 18, a conveyor belt 19, a fixing rod 20, an electric feeding push plate 21 and a sliding rod 2101, wherein the second fixing seat 18 is arranged at the front part of the base 1, the conveyor belt 19 is rotatably arranged between the left end and the right end of the second fixing seat 18, the height of the conveyor belt 19 is consistent with that of the working platform 2, the fixing rod 20 which is symmetrical left and right is arranged on the second fixing seat 18, the upper part of one side of the fixing rod 20 opposite to the fixing rod 20 is provided with a symmetrical feeding chute 12, the sliding rod 2101 which is matched with the feeding chute and can slide along the warp direction of the feeding chute 12 is arranged in the feeding chute 12, the bottoms of the symmetrical sliding rods 2101 are jointly connected with the electric feeding push plate 21, and the electric feeding push plate 21 is in sliding fit with the conveyor belt 19 when moving in the warp direction.

As shown in fig. 6, the electric feeding push plate further comprises a telescopic stop rod 2102, wherein the right side of the front part of the second fixing seat 18 is connected with the telescopic stop rod 2102, and the telescopic stop rod 2102 is connected with the right side of the front part of the electric feeding push plate 21.

When the device is used, a worker places a terminal block on the left side of the conveyor belt 19, the conveyor belt 19 runs to convey the terminal block to be detected to the middle of the fixed rods 20 on the left side and the right side, the electric feeding push plate 21 is electrified to work, the electric feeding push plate 21 drives the sliding rod 2101 connected with the electric feeding push plate to move backwards along the feeding chute 12, the electric feeding push plate 21 pushes the terminal block on the conveyor belt 19 to the center point position of the working platform 2, and the telescopic stop rod 2102 synchronously moves backwards in an extending mode to avoid the terminal block which is not detected from continuously moving rightwards; the electric clamping plates 13 on the left side and the right side are electrified to work, the electric clamping plates 13 on the left side and the right side move in opposite directions along the first sliding groove 201 until the electric clamping plates 13 on the left side and the right side are in contact with the terminal table and clamp and fix the terminal table, the fourth guide rod 14 plays a guiding role for the opposite movement of the electric clamping plates 13, the spring 15 resets by compression deformation, and thrust force is applied to the electric clamping plates 13 to the terminal table, so that the electric clamping plates 13 are clamped and fixed more firmly; the motor 4 is electrified to work, the motor 4 drives the screw rod 3 to rotate through the output shaft of the motor, the screw rod 3 rotates to drive the sliding block 5 to move leftwards or rightwards, the position of the sliding block 5 is flexibly adjusted according to the volume of the terminal table or the detection requirement, and the position of the detection assembly is flexibly adjusted; the electric telescopic rod 6 can move upwards or downwards in the third chute 501, so that the height of the detection assembly is adjusted according to the height of the terminal, and meanwhile, the function of efficiently inserting the detection needle 801 into the detection end of the terminal block for detection and efficiently extracting the detection needle from the detection end of the terminal block after detection is completed is efficiently realized through the lifting function of the electric telescopic rod 6; the electric telescopic rod 6 realizes the function of forward extension or backward contraction of the detection assembly through telescopic movement thereof; the electric sliding block 8 is electrified to work, the electric sliding block 8 slides rightwards or rightwards in the fourth sliding groove 701, the third guide rod 9 plays a guiding role for the movement of the electric sliding block 8, the electric sliding block 8 drives the second guide rod 802 connected with the electric sliding block to synchronously move, the second guide rod 802 drives the detection needle 801 to move leftwards or rightwards, the detection needle 801 can move forwards and backwards along the second guide rod 802 according to the specification and detection requirement of the terminal block, the function of flexibly adjusting the detection needle 801 according to the specification of the terminal block is realized, and the high-efficiency detection function of the terminal blocks with different specifications is realized.

Example 2

As shown in fig. 6, on the basis of embodiment 1, the discharging assembly comprises an electric discharging push plate 16 and a fifth guide rod 17, a weft second chute 202 is provided on the center line of the working platform 2, a fifth guide rod 17 is provided in the second chute 202, the fifth guide rod 17 is slidably connected with the electric discharging push plate 16, the fifth guide rod 17 penetrates through the bottom of the electric discharging push plate 16, and the bottom end of the electric discharging push plate 16 slides in the second chute 202.

After the detection of the terminal block is completed, the electric telescopic rod 6 ascends along the third chute 501, the detection needle 801 is far away from the terminal block, the electric clamping plates 13 on the left side and the right side reversely move and reset along the first chute 201, and the spring 15 is compressed and deformed; the electric discharging push plate 16 is electrified to work, the electric discharging push plate 16 moves forwards along the second sliding groove 202, the electric feeding push plate 21 moves forwards to reset, the telescopic stop rod 2102 contracts to reset, and therefore the terminal block which is detected is pushed onto the conveying belt 19, and the conveying belt 19 conveys the terminal block which is detected to a designated position to be collected.

As shown in fig. 4, the lamp assembly further comprises a glass cover 10 and a lighting lamp 11, wherein the lighting lamp 11 for assisting lighting and the glass cover 10 for providing protection for the lighting lamp 11 are connected to the bottom of the mounting plate 7.

The arrangement of the illumination lamp 11 provides illumination assistance for accurate and efficient detection of the terminal block by the detection assembly.

As shown in fig. 7, a dust cover 22 is further included, and a dust cover 22 for dust prevention is connected to the working platform 2.

Dust-free detection of the terminal block by the detection assembly is achieved through the dust cover 22.

The foregoing examples have shown only the preferred embodiments of the utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that modifications, improvements and substitutions can be made by those skilled in the art without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The utility model provides a high-efficient accurate terminal platform function test equipment, including base (1), work platform (2) and first fixing base (101), work platform (2) set up on base (1), first fixing base (101) are installed to one side symmetry on base (1), a serial communication port, still including screw rod (3), motor (4), sliding block (5), remove the subassembly, detect the subassembly, clamping assembly, material loading subassembly and unloading subassembly, rotationally be connected with screw rod (3) between first fixing base (101), screw rod (3) threaded ground runs through sliding type ground sliding block (5) that set up on base (1), the one end of screw rod (3) and the output shaft of motor (4) that set up on base (1), sliding block (5) and the outer wall sliding fit of work platform (2) one side are connected with the detection subassembly that is used for carrying out high-efficient accurate detection to the terminal platform through removing the subassembly, be provided with on work platform (2) and be used for treating the fixed clamping subassembly of work piece and to accomplish the work piece of unloading of detection and set up and carry out the material loading onto one side of the relative piece that is used for waiting to examine the subassembly.

2. The efficient and accurate terminal block function detection device according to claim 1, wherein the moving assembly comprises a first guide rod (502), an electric telescopic rod (6) and a mounting plate (7), a vertical third sliding groove (501) is formed in the sliding block (5), the first guide rod (502) is arranged in the third sliding groove (501), the electric telescopic rod (6) is connected to the first guide rod (502) in a sliding mode, the electric telescopic rod (6) is matched with the third sliding groove (501) and can slide up and down in the third sliding groove (501), and one end, far away from the third sliding groove (501), of the electric telescopic rod (6) is connected with the mounting plate (7).

3. The efficient and accurate terminal block function detection device according to claim 1, wherein the detection assembly comprises an electric sliding block (8), a detection needle (801), a second guide rod (802) and a third guide rod (9), a fourth sliding groove (701) parallel to the length direction of the mounting plate (7) is symmetrically formed in the bottom of the mounting plate (7), the third guide rod (9) is arranged in the fourth sliding groove (701), the electric sliding block (8) which is matched with the fourth sliding groove (701) and can horizontally slide in the fourth sliding groove (701) is connected to the third guide rod (9) in a sliding mode, a second guide rod (802) perpendicular to the third guide rod (9) is connected to one opposite side of the lower portion of the electric sliding block (8), and the detection needle (801) for performing function detection on the terminal block is connected to the second guide rod (802) in a sliding mode.

4. The efficient and accurate terminal block function detection device according to claim 1, wherein the clamping assembly comprises an electric clamping plate (13), a fourth guide rod (14) and a spring (15), weft-wise first sliding grooves (201) are symmetrically formed in the working platform (2), the fourth guide rods (14) are arranged in the first sliding grooves (201), the electric clamping plate (13) is jointly connected between the fourth guide rods (14) adjacent to each other in the warp direction, the bottom end of the electric clamping plate (13) can slide in the first sliding grooves (201), the spring (15) is arranged between the electric clamping plate (13) and the groove wall, which is close to the outer side of the working platform (2), of the first sliding groove (201), and the spring (15) is wound on the fourth guide rods (14).

5. The efficient and accurate terminal block function detection device according to claim 1, wherein the discharging assembly comprises an electric discharging push plate (16) and a fifth guide rod (17), a weft second chute (202) is formed in the center line of the working platform (2), the fifth guide rod (17) is arranged in the second chute (202), the electric discharging push plate (16) is connected to the fifth guide rod (17) in a sliding mode, and the bottom end of the electric discharging push plate (16) slides in the second chute (202).

6. The efficient and accurate terminal block function detection device according to claim 1, wherein the feeding assembly comprises a second fixing seat (18), a conveyor belt (19), a fixing rod (20), an electric feeding push plate (21) and a sliding rod (2101), the second fixing seat (18) is arranged on one side, opposite to the side provided with the sliding block (5), of the base (1), the conveyor belt (19) is rotatably arranged between two ends of the warp direction of the second fixing seat (18), the height of the conveyor belt (19) is consistent with that of the working platform (2), the second fixing seat (18) is provided with a symmetrical fixing rod (20), the fixing rod (20) is parallel to the width direction of the second fixing seat (18), the upper part of one side, opposite to the fixing rod (20), of the fixing rod (20) is provided with a symmetrical feeding sliding chute (12), the sliding rod (2101) which is matched with the base and can slide along the warp direction of the feeding sliding chute (12), the bottom of the symmetrical sliding rod (2101) is jointly connected with the electric feeding push plate (21), and the electric feeding push plate (21) moves along the warp direction of the conveyor belt (19).

7. The efficient and accurate terminal block function detection device according to any one of claims 1 to 6, further comprising a telescopic stop lever (2102), wherein a side, away from the working platform (2), of the second fixing seat (18) is connected with the telescopic stop lever (2102), and the telescopic stop lever (2102) is connected with one side of the electric feeding push plate (21).

8. The efficient and accurate terminal block function detection device according to claim 7, further comprising a glass cover (10) and an illuminating lamp (11), wherein the bottom of the mounting plate (7) is connected with the illuminating lamp (11) for assisting illumination and the glass cover (10) for providing protection for the illuminating lamp (11).

9. The efficient and accurate terminal block function detection device according to claim 8, further comprising a dust cover (22), wherein the dust cover (22) for dust prevention is connected to the working platform (2).