Relay and production line thereof

Abstract

The relay comprises a shell, a bottom cover matched with the shell to form a sealed space, a coil rack arranged in the sealed space, a movable contact piece assembly and a static contact piece assembly, the shell is provided with a communicating hole communicated with the sealed space, and nitrogen is arranged in the sealed space; the movable contact piece assembly comprises a movable contact piece, a plastic head penetrating through the movable contact piece and a spring pressing the movable contact piece downwards, the spring is a tower type spring, the static contact piece comprises a body, the body is provided with a mounting hole for assembling a screw rod, the front face and / or the back face of the body are / is provided with a plurality of clamping points, the clamping points are distributed around the mounting hole, and one side of each clamping point protrudes in the mounting hole; according to the production sequence, the production line sequentially comprises coil rack assembling equipment, screw pressing equipment, static contact piece pre-tightening equipment, screw riveting equipment, dust removal equipment, pressing and power-on testing equipment and ultrasonic welding equipment. The relay produced by the invention is high in reliability.

Description

Technical Field

[0001] The invention relates to a relay, in particular to a relay and a production line thereof. Background Art

[0002] Existing relays generally include a plastic head cover, a shell, a coil frame arranged in the shell, a moving contact assembly and a static contact assembly. For example, a relay with a Chinese patent publication number of CN213877966U includes an insulating head cover, a static contact assembly, a moving contact assembly, a shell, a coil assembly, an iron core and a large magnetic attraction plate; the static contact assembly includes a screw, a static contact arranged at the lower end of the screw and a nut threadedly connected to the screw; the moving contact assembly includes a moving contact and a plastic head passing through the moving contact, the plastic head and the moving contact are over-tightly matched, one end of the plastic head is installed in the guide column hole at the bottom of the insulating head cover, and a spring is arranged between the moving contact and the insulating head cover; the insulating head cover includes a plastic body and a plurality of top pressure columns arranged at the bottom of the plastic body, the top pressure columns are integrally injection molded with the plastic body, the lower end of the top pressure column is conical, and the lower end of the top pressure column is pressed on the large magnetic attraction plate. Disadvantages of existing relays: 1. Lack of heat dissipation and arc extinguishing mechanism, the relay has limited overload capacity and cannot meet the requirements of large current passing; 2. The spring matched with the moving contact assembly is an ordinary spring, and the top ring and bottom ring of the spring have the same diameter. The balance of this type of spring is poor, which can easily lead to uneven force on both sides of the spring. The moving contact assembly may deviate and get stuck when it is raised or lowered; 3. Before being installed into the housing, the static contact assembly and the moving contact assembly are placed on the mold, but the static contact and the screw are not tightly matched. When the moving contact assembly and the static contact assembly are installed into the housing together, the static contact is easily bounced up under the action of the spring elastic force of the moving contact assembly, resulting in the inability to accurately assemble the static contact, which brings certain assembly difficulties; 4. At present, the dust removal process inside the relay housing is not carried out in the assembly process of the relay, so there are certain hidden dangers in the assembly of the relay. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a relay and a production line thereof, so as to solve the technical problems existing in the prior art.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a relay, comprising a housing, a bottom cover that cooperates with the housing to form a sealed space, a coil frame, a moving contact assembly and a stationary contact assembly arranged in the sealed space, the housing is provided with a connecting hole that is connected to the sealed space, a plug is provided at the connecting hole, and nitrogen is provided in the sealed space; the moving contact assembly is arranged in the sealed space, and comprises a moving contact, a plastic head that passes through the moving contact, and a spring that presses the moving contact downward, the spring is a tower spring, and the bottom ring diameter of the spring is smaller than the top ring diameter; the stationary contact assembly comprises a stationary contact and a screw The static contact piece is arranged in the sealed space, one end of the screw is electrically connected to the static contact piece, and the other end extends out of the sealed space, the static contact piece includes a body, the body is provided with a mounting hole for the screw to be assembled, the front and / or back of the body are provided with a plurality of card points, the card points are distributed around the mounting hole, and one side of the card points protrudes into the mounting hole; the housing is provided with a mounting seat, the mounting seat includes a first slot for the relay plug to extend out and a second slot arranged on both sides of the first slot, a safety piece is arranged in the second slot, and a protective cover covering the safety piece is provided on the mounting seat at the second slot. Principle of the present invention: 1. After the relay is assembled, nitrogen is injected into the relay through the connecting hole, and then the connecting hole is sealed with a plug to ensure that nitrogen can be retained in the relay for a long time. Nitrogen is an inert gas and has the functions of heat dissipation and arc extinguishing; 2. The moving contact assembly adopts a tower spring reset. The inverted triangle structure of the tower spring has good stability, a compensation and balancing function, and automatically repairs the centering to ensure the smooth lifting and lowering of the moving contact assembly; 3. A card point is set on the static contact piece. The card point not only does not affect the function of the static contact piece, but also can temporarily fix the screw and the static contact piece after the screw is inserted into the mounting hole, which is convenient for subsequent assembly; 4. The protective cover is separately matched with the safety piece, which is convenient for the separate disassembly and assembly of the safety piece.

[0005] As an improvement, the input end of the connecting hole is in a tapered hole shape.

[0006] As an improvement, the coil frame includes a main body, a pressure plate arranged on the top of the main body and a yoke plate arranged on the bottom of the main body, the two ends of the yoke plate are bent 90 degrees and are located on both sides of the coil frame, the inner wall of the shell is provided with a card slot, and the two ends of the yoke plate are provided with card feet that cooperate with the card slot.

[0007] As an improvement, the moving contact piece is a high-conductivity copper sheet, and the plastic head is a high-temperature resistant plastic part.

[0008] As an improvement, the plastic head includes a disc arranged at the bottom of the moving contact piece, a pushing protrusion arranged in the middle of the bottom of the disc and a connecting protrusion arranged in the middle of the top of the moving contact piece, and the lower end of the spring is sleeved on the connecting protrusion.

[0009] As an improvement, the clamping point is a spherical crown-shaped protrusion arranged on the front and / or back side of the main body.

[0010] As an improvement, the clamping point is a protrusion that causes the inner wall of the mounting hole to be deformed due to the grooves arranged on the front and / or back of the main body.

[0011] As an improvement, the front and / or back side of the main body is provided with three circumferentially evenly distributed clamping points.

[0012] The production line of the relay of the present invention comprises, in order of production, a coil frame assembly device, a screw pressing device, a static contact piece pre-installation device, a screw riveting device, a dust removal device, a pressing and power-on test device, and an ultrasonic welding device; Coil frame assembly equipment: winding wire on the coil frame and press-fitting the inserts onto the coil frame; Screw pressing equipment: press the two hexagonal screws of the stationary contact assembly onto the housing; Static contact piece pre-tightening equipment: press the static contact piece onto the screw rod, and use the clamping point on the static contact piece to cooperate with the screw rod for pre-tightening; Screw riveting equipment: The screw is riveted by rotary riveting to completely fix the stationary contact piece and the screw; Dust removal equipment: remove dust from inside the relay housing; Pressing and power-on test equipment: install the coil frame into the housing and press it tightly; conduct power-on test on the relay; Ultrasonic welding equipment: ultrasonically weld the bottom cover and the outer shell.

[0013] As an improvement, the dust removal equipment includes a workbench, a clamping mechanism arranged above the workbench and a lifting mechanism arranged inside the workbench; the workbench includes a dust suction box body, a dust suction chamber is formed inside the dust suction box body, a suction port connected to the dust suction chamber is provided on the top of the dust suction box body, a suction outlet connected to the dust suction chamber is provided on the side of the dust suction box body, the suction outlet is connected to the negative pressure generator through an air pipe, the lifting mechanism is arranged in the dust suction chamber, the lifting mechanism includes a first cylinder and a push rod connected to the first cylinder, the push rod faces upward and extends from the suction port; air blowing pipes are provided on both sides of the push rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. After the relay is assembled, use the connecting hole to inject nitrogen into the relay, and then use a plug to seal the connecting hole to ensure that nitrogen can be retained in the relay for a long time. Nitrogen is an inert gas and has the functions of heat dissipation and arc extinguishing. 2. The moving contact assembly adopts a tower spring reset. The inverted triangle structure of the tower spring has good stability, compensation and balance function, automatic repair and alignment, and ensures the smooth lifting and lowering of the moving contact assembly; 3. Set a card point on the static contact piece. The card point will not affect the function of the static contact piece. When the screw is inserted into the mounting hole, the screw and the static contact piece can be temporarily fixed, which is convenient for subsequent assembly. 4. The protective cover is matched with the safety plate separately, which is convenient for the safety plate to be disassembled and assembled separately; 5. The dust removal equipment can be used to remove dust from the inside of the relay housing and the contact surface between the static contact piece and the moving contact piece, thereby improving the reliability of relay assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a partial exploded view of the relay.

[0016] Figure 2 This is a three-dimensional diagram of the relay housing.

[0017] Figure 3 This is a cross-sectional view of a relay.

[0018] Figure 4 This is a cross-sectional view of the relay moving contact assembly.

[0019] Figure 5 Schematic diagram of the relay moving contact assembly.

[0020] Figure 6 This is a schematic diagram of the relay static contact assembly.

[0021] Figure 7 Schematic diagram of the static contact piece.

[0022] Figure 8 Schematic diagram of the static contact pre-tightening equipment.

[0023] Fig. 9 This is a side view of the dust removal equipment.

[0024] Fig.10 This is a schematic diagram of the dust removal equipment workbench.

[0025] Fig.11 This is a cross-sectional view of the dust removal equipment workbench.

[0026] Fig.12 This is a schematic diagram of the compression and power-on test equipment. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] like Figure 2 , 3 As shown, a relay includes a shell 1, a bottom cover 2 that cooperates with the shell 1 to form a sealed space, a coil frame 6 arranged in the sealed space, a coil wound on the coil frame, an iron core arranged in the middle of the coil frame, a moving contact piece assembly 4 and a stationary contact piece assembly 5.

[0029] like Figure 6 , 7As shown, the static contact assembly 5 is arranged on both sides of the dynamic contact assembly 4, and the static contact assembly 5 includes a static contact 51 and a screw 52 electrically connected to the static contact 51. The static contact 51 is arranged in a sealed space, and one end of the screw 52 extends from the top of the housing 1. The static contact 51 includes a body 510, and the body 510 is a copper sheet, and the body 510 is electrically connected to the screw 52; the body 510 is provided with a mounting hole 511 for assembling the screw 52, ​​and the mounting hole 511 is a circular hole; one side of the body 510 is provided with an arc groove 512, and the arc grooves 512 of the two static contacts 51 are arranged opposite to each other, and the space formed between the two arc grooves 512 accommodates the push portion of the dynamic contact assembly 4; the front and / or back of the body 510 is provided with three circumferentially evenly distributed The card point 513, one side of which protrudes in the mounting hole; the card point 513 is a spherical crown-shaped protrusion set on the front and / or back of the body, and the protrusion is integrally formed with the body, or the card point 513 is a protrusion that causes the inner wall of the mounting hole to deform due to the groove set on the front and / or back of the body, and the protrusion is formed by later stamping processing; the protruding side of the card point 513 is in an arc shape, which has low friction, reduces the difficulty of the screw rod being installed in the mounting hole, and can prevent the screw rod from being separated from the constraint of the mounting hole to a certain extent. The card point is set on the static contact piece, which not only does not affect the function of the static contact piece, but also can temporarily fix the screw rod and the static contact piece after the screw rod is inserted into the mounting hole, which is convenient for subsequent assembly.

[0030] like Figure 4 , 5As shown, the movable contact piece assembly 4 is arranged in a sealed space, and includes a movable contact piece 41, a plastic head 42 passing through the movable contact piece 41 and integrated with the movable contact piece 41, and a spring 43 pressing the movable contact piece 41. An iron core 7 is arranged at the center of the coil frame 6, and a coil is wound on the coil frame 6. The iron core 7 can act on the plastic head 42 to drive the movable contact piece 41. The moving contact piece 41 and the plastic head 42 are formed by in-mold injection molding, and the two are firmly combined and have good durability; the moving contact piece 41 is a high-conductivity copper sheet, and the plastic head 42 is a high-temperature resistant plastic part. This design can enhance the overload capacity of the relay and allow the relay to pass a larger current; the moving contact piece 41 is circular, and the plastic head 42 passes through the center of the moving contact piece 41. The plastic head 42 includes a disk 421 arranged at the bottom of the moving contact piece 41, a push protrusion 422 arranged in the middle of the bottom of the disk 421, and a connecting protrusion 423 arranged in the middle of the top of the moving contact piece 41. The lower end of the spring 43 is sleeved on the connecting protrusion 423, and the iron core 7 acts on the push protrusion 422. The connecting protrusion 423 plays a role in fixing the lower end of the spring 43 and keeping the spring 43 at the center of the moving contact piece. The spring 43 is a tower spring, and the bottom ring diameter of the spring is smaller than the top ring diameter, and the lower ring diameter is slightly larger than the diameter of the connecting protrusion 423. The moving contact assembly adopts a tower spring reset. The inverted triangle structure of the tower spring has good stability, a compensation balance function, and automatic centering to ensure the smooth lifting and lowering of the moving contact assembly.

[0031] like Figure 2 , 3 As shown, the bottom cover 2 is ultrasonically welded to the housing 1, the housing 1 includes a head at the top and side surrounding parts around the head, the moving contact piece assembly 4 and the static contact piece assembly 5 are installed inside the head, and the screw extends from the head. The inner wall of the housing 1 is provided with a card slot 11, the coil frame 6 includes a body, a pressure plate provided at the top of the body and a yoke plate provided at the bottom of the body, the two ends of the yoke plate are bent 90 degrees and are located on both sides of the coil frame 6, and the two ends of the yoke plate are provided with card feet 61 that cooperate with the card slot to achieve fixed cooperation between the coil frame 6 and the housing 1.

[0032] like Figure 2 As shown, a connecting hole 3 communicating with the sealed space is provided on the head of the housing 1, a plug is provided at the connecting hole 3, nitrogen is provided in the sealed space, and the nitrogen is injected through the connecting hole 3; the input end of the connecting hole 3 is in the shape of a cone hole, and the cone hole is connected to the injection nozzle to play a role in positioning and increasing the contact area. After the relay is assembled, nitrogen is injected into the relay through the connecting hole, and then the connecting hole is sealed with a plug to ensure that nitrogen can be retained in the relay for a long time. Nitrogen is an inert gas and has the functions of heat dissipation and arc extinguishing.

[0033] like Figure 1As shown, the housing 1 is provided with a mounting base 8, which is connected to the housing 1 by a buckle, and the mounting base 8 includes a first slot 81 for the relay plug to extend and a second slot 82 arranged on both sides of the first slot 81; a fuse piece 9 is arranged in the second slot, and a protective cover 91 covering the fuse piece 9 is arranged on the mounting base 8 at the second slot 82; the fuse piece 9 is used to protect the relay from burning due to overload, and the protective cover 91 cooperates with the fuse piece 9 separately, so as to facilitate the separate disassembly and assembly of the fuse piece 9.

[0034] The production line for producing the relay of the present invention comprises, in order of production, coil frame assembly equipment, screw pressing equipment, static contact piece pre-installation equipment, screw riveting equipment, dust removal equipment, pressing and power-on testing equipment and ultrasonic welding equipment.

[0035] Coil frame assembly equipment: Winding wire on the coil frame and press-fitting the inserts onto the coil frame.

[0036] Screw pressing equipment: press the two hexagonal screws of the stationary contact assembly onto the housing.

[0037] like Figure 8 As shown, the static contact pre-tightening device: the static contact is pressed onto the screw, and the clamping point on the static contact cooperates with the screw for pre-tightening. It includes a pre-tightening tool 112, a pre-tightening head 111 arranged above the pre-tightening tool 112, and a pre-tightening cylinder 116 driving the pre-tightening head 111; the pre-tightening tool 112 is provided with two positioning grooves 113, the shape and distribution of the positioning grooves 113 are the same as those of the static contact, the positioning groove 113 is provided with a first avoidance hole 114 corresponding to the position of the static contact installation hole, and a second avoidance hole 115 is also provided between the two positioning grooves 113. During operation, first place the two stationary contacts in the two positioning grooves 113 respectively; then place the moving contact assembly at the second avoidance hole 115; cover the lower opening of the shell on the pre-tightening tooling 112; start the pre-tightening cylinder 116, which drives the pre-tightening pressure head 111 to act on the top of the shell, and drives the shell connecting screw to move downward together until the screw cooperates with the stationary contact.

[0038] Screw riveting equipment: The screw is riveted by rotary riveting to completely fix the static contact piece and the screw.

[0039] like Figures 9 to 11As shown, the dust removal device: removes dust from the inside of the relay housing. The dust removal device includes a workbench, a pressing mechanism 122 arranged above the workbench, and a lifting mechanism 123 arranged inside the workbench. The workbench includes a bottom plate 124, a dust collection box body 121 arranged on the bottom plate 124, and a bracket 125 arranged on one side of the dust collection box body 121. A dust suction chamber 1214 is formed in the dust suction box body 121, and a suction port 1213 communicating with the dust suction chamber 1214 is provided at the top of the dust suction box body 121, and a suction outlet 1212 communicating with the dust suction chamber 1214 is provided at the side of the dust suction box body 121; a dust suction station is formed at the top of the dust suction box body 121, and a positioning protrusion 1211 is provided at the top of the dust suction box body 121 along the edge of the suction port 1213. When working, the relay housing is placed at the suction port 1213 of the dust suction station through the positioning protrusion 1211, and the bottom opening of the relay housing corresponds to the suction port 1213; the suction outlet 1212 is connected to the negative pressure generator through an air pipe, and the negative pressure generator exhausts air in the shell through the dust suction box body 121. The lifting mechanism 123 is arranged in the dust suction chamber 1214, and the lifting mechanism 123 includes a first cylinder and a push rod 1231 connected to the first cylinder. The push rod 1231 is upward and extends from the suction port 1213. When working, the push rod 1231 moves upward and lifts the moving contact piece; air blowing pipes 1232 are provided on both sides of the push rod 1231, and the air outlet end of the air blowing pipe 1232 is upward and aimed at the static contact piece. The air blowing pipe 1232 is attached to the push rod 1231 through a pipe clamp. After the push rod 1231 lifts the moving contact piece, the air blowing pipe 1232 blows out high-pressure gas to blow off the dust on the contact surface of the moving contact piece and the static contact piece, and cooperates with the dust suction action to take away the dust. The clamping mechanism 122 includes a pressing block 1222 disposed above the suction port 1213 and an inverted second cylinder 1221, the second cylinder 1221 is connected to the pressing block 1222, the second cylinder 1221 is disposed on the bracket 125, the pressing block 1222 is slidably matched with the bracket 125, and the second cylinder 1221 clamps and fixes the relay housing through the pressing block 1222. During operation, the housing assembled with the static contact piece and the moving contact piece is vertically placed on the top of the dust collecting box body 121, and the opening at the bottom of the housing corresponds to the suction port 1212; the clamping mechanism 122 is started to clamp the housing; the negative pressure generator is started to form a negative pressure in the dust collecting chamber 1214 inside the dust collecting box body 121, and then the negative pressure dust removal is performed inside the housing; the lifting mechanism 123 is started to lift the moving contact piece and separate it from the static contact piece, and the contact surface between the static contact piece and the moving contact piece can be dusted.

[0040] like Fig.12As shown, the pressing and power-on test equipment: the coil frame is installed into the shell and pressed and fixed, and the relay is powered on for testing. The pressing and power-on test equipment includes a fixed base 134, a floating base 133 arranged above the fixed base 134, a test probe 135 arranged on the fixed base 134 and corresponding to two screws respectively, a test pressing block 132 arranged above the floating base 133, and a test cylinder 131 driving the test pressing block 132. The test probe 135 has a spring buffer, and the test probe 135 is connected to the power supply. When the test probe 135 is electrically connected to the screw of the relay, the performance can be aligned for testing. The floating base 133 is provided with a limit groove. During the test, the relay is installed upside down in the limit groove. The floating base 133 is provided with a through hole corresponding to the screw, so that the screw can pass through the through hole and contact the test probe 135. The test pressing block 132 includes a fixed portion 1321 and a movable portion 1322 arranged at the bottom of the fixed portion 1321. The movable portion 1322 is slidably connected to the fixed portion 1321. The position of the movable portion is adjusted according to the position of the relay coil frame so that the movable portion 1322 can be pressed on the yoke plate of the coil frame. On the one hand, the test pressing block 132 pushes the relay downward to contact the test probe 135, and on the other hand, it pushes the yoke plate in the shell to complete the fixation.

[0041] Ultrasonic welding equipment: ultrasonically weld the bottom cover and the outer shell.

Claims

1. A relay, comprising a housing, a bottom cover cooperating with the housing to form a sealed space, a coil frame arranged in the sealed space, a moving contact assembly and a stationary contact assembly, characterized in that: The shell is provided with a connecting hole connected with the sealed space, a plug is provided at the connecting hole, and nitrogen is provided in the sealed space; the moving contact piece assembly is provided in the sealed space, and comprises a moving contact piece, a plastic head passing through the moving contact piece, and a spring pressing the moving contact piece downward, the spring is a tower spring, and the bottom ring diameter of the spring is smaller than the top ring diameter; the static contact piece assembly comprises a static contact piece and a screw rod, the static contact piece is provided in the sealed space, one end of the screw rod is electrically connected to the static contact piece, and the other end extends out of the sealed space, the static contact piece comprises a body, a mounting hole for screw assembly is provided on the body, a plurality of card points are provided on the front and / or back of the body, the card points are distributed around the mounting hole, and one side of the card point protrudes into the mounting hole; the shell is provided with a mounting seat, the mounting seat comprises a first slot for relay plug-in to extend and a second slot provided on both sides of the first slot, a safety piece is provided in the second slot, and a protective cover covering the safety piece is provided on the mounting seat at the second slot.

2. A relay according to claim 1, characterized in that: The input end of the communicating hole is in a tapered hole shape.

3. A relay according to claim 1, characterized in that: The coil frame includes a main body, a pressure plate arranged on the top of the main body and a yoke plate arranged on the bottom of the main body. The two ends of the yoke plate are bent 90 degrees and are located on both sides of the coil frame. The inner wall of the shell is provided with a card slot, and the two ends of the yoke plate are provided with card feet that cooperate with the card slot.

4. A relay according to claim 1, characterized in that: The moving contact piece is a high-conductivity copper piece, and the plastic head is a high-temperature resistant plastic part.

5. A relay according to claim 1, characterized in that: The plastic head comprises a disc arranged at the bottom of the moving contact piece, a pushing protrusion arranged in the middle of the bottom of the disc and a connecting protrusion arranged in the middle of the top of the moving contact piece, and the lower end of the spring is sleeved on the connecting protrusion.

6. A relay according to claim 1, characterized in that: The clamping points are spherical crown-shaped protrusions arranged on the front and / or back of the main body.

7. A relay according to claim 1, characterized in that: The clamping point is a protrusion that causes the inner wall of the mounting hole to be deformed due to the grooves arranged on the front and / or back of the main body.

8. A relay according to claim 1, characterized in that: The front and / or back of the body is provided with three evenly distributed clamping points.

9. A production line for a relay as claimed in claim 1, characterized in that: In order of production, it includes coil frame assembly equipment, screw pressing equipment, static contact piece pre-installation equipment, screw riveting equipment, dust removal equipment, pressing and power-on testing equipment and ultrasonic welding equipment; Coil frame assembly equipment: winding wire on the coil frame and press-fitting the inserts onto the coil frame; Screw pressing equipment: press the two hexagonal screws of the stationary contact assembly onto the housing; Static contact piece pre-tightening equipment: press the static contact piece onto the screw rod, and use the clamping point on the static contact piece to cooperate with the screw rod for pre-tightening; Screw riveting equipment: The screw is riveted by rotary riveting to completely fix the stationary contact piece and the screw; Dust removal equipment: remove dust from inside the relay housing; Pressing and power-on test equipment: install the coil frame into the housing and press it tightly; conduct power-on test on the relay; Ultrasonic welding equipment: ultrasonically weld the bottom cover and the outer shell.

10. A relay production line according to claim 9, characterized in that: The dust removal equipment includes a workbench, a clamping mechanism arranged above the workbench and a lifting mechanism arranged inside the workbench; the workbench includes a dust suction box body, a dust suction chamber is formed inside the dust suction box body, a suction port connected to the dust suction chamber is provided on the top of the dust suction box body, a suction outlet connected to the dust suction chamber is provided on the side of the dust suction box body, the suction outlet is connected to the negative pressure generator through an air pipe, the lifting mechanism is arranged in the dust suction chamber, the lifting mechanism includes a first cylinder and a push rod connected to the first cylinder, the push rod faces upward and extends from the suction port; air blowing pipes are provided on both sides of the push rod.

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