A multi-wire saw wiring assembly

Abstract

The application discloses a kind of multi-wire cutting machine wiring assembly, belong to glass and semiconductor production and manufacturing technical field, including rack, linear guide rail assembly is provided on the rack, linear guide rail assembly is provided with coupling seat, coupling seat is fixedly connected on the slider of linear guide rail assembly, the outside of coupling seat is provided with swing angle encoder and speed encoder, installation mechanism is provided on coupling seat, installation mechanism is connected with swing angle encoder and speed encoder, the outside of coupling seat is provided with wire guide mechanism, wire guide mechanism is connected with installation mechanism, the present application has the function of metal wire speed size and direction measurement, can control the stability of wire cutting speed, the length of metal wire back and forth wiring is controlled by monitoring the change of winding diameter, all actions are automated, stable and reliable performance, structure layout is reasonable, installation and maintenance are convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass and semiconductor production and manufacturing, and more particularly to a wiring assembly of a multi-wire cutting machine. BACKGROUND

[0002] At present, the wafer and sapphire and microcrystalline glass semi-finished products in the semiconductor industry are generally in the shape of a column block, and then need to be cut into thin pieces by diamond metal wires and then processed into finished products. The machine that completes this cutting process is a multi-wire cutting machine, which can cut dozens or even hundreds of pieces at the same time, and the production efficiency is extremely high. When the diamond metal wire cuts the semi-finished product, the take-up and pay-off mechanism needs to be used to complete the take-up and pay-off action.

[0003] The existing multi-wire cutting machine is difficult to control the stability of the wire cutting speed, and it is not convenient to detect the size and direction of the metal wire speed. Therefore, we propose a wiring assembly of a multi-wire cutting machine. SUMMARY

[0004] 1. Technical problem to be solved

[0005] In view of the problems in the prior art, the purpose of the present application is to provide a wiring assembly of a multi-wire cutting machine. The present application has the functions of measuring the size and direction of the metal wire speed, can control the stability of the wire cutting speed, and can control the length of the metal wire back and forth by monitoring the change of the winding diameter. All actions are automated, stable and reliable in performance, reasonable in structure layout, and convenient to install and maintain.

[0006] 2. Technical scheme

[0007] To solve the above problems, the present application adopts the following technical scheme:

[0008] A wiring assembly of a multi-wire cutting machine, comprising a rack, a linear guide assembly is arranged on the rack, a connecting seat is arranged on the linear guide assembly, the connecting seat is fixedly connected to the sliding block of the linear guide assembly, a swing angle encoder and a speed encoder are arranged on the outer side of the connecting seat, an installation mechanism is arranged on the connecting seat, the installation mechanism is connected with the swing angle encoder and the speed encoder, a wire guide mechanism is arranged on the outer side of the connecting seat, and the wire guide mechanism is connected with the installation mechanism. The present application has the functions of measuring the size and direction of the metal wire speed, can control the stability of the wire cutting speed, and can control the length of the metal wire back and forth by monitoring the change of the winding diameter. All actions are automated, stable and reliable in performance, reasonable in structure layout, and convenient to install and maintain.

[0009] As a preferred scheme of the present application, the installation mechanism comprises an installation assembly and a fixing assembly, the installation assembly and the fixing assembly are arranged on the connecting seat, and the installation assembly and the fixing assembly are connected.

[0010] As a preferred scheme of the present application, the mounting assembly comprises a swing arm and a rotating shaft, the rotating shaft is fixedly connected in the joint seat, the left end of the rotating shaft is fixedly connected with the swing angle encoder, the swing arm is fixedly connected with the right end of the rotating shaft, and the speed encoder is arranged on the swing arm.

[0011] As a preferred scheme of the present application, the fixing assembly comprises two coupling fixing pins, the two coupling fixing pins are arranged on the joint seat and the swing arm respectively, the joint seat and the swing angle encoder are fixedly connected through one coupling fixing pin, and the swing arm and the speed encoder are fixedly connected through the other coupling fixing pin.

[0012] As a preferred scheme of the present application, the wire mechanism comprises a wire wheel body and a wire wheel shaft, the wire wheel shaft is installed on the swing arm, and the wire wheel body is fixedly connected to the surface of the wire wheel shaft.

[0013] As a preferred scheme of the present application, the outer wire groove plane of the wire wheel body is coincident with the center line of the rotating shaft.

[0014] As a preferred scheme of the present application, the rack is provided with a screw rod rear seat and a screw rod front seat, a ball screw assembly is installed between the screw rod rear seat and the screw rod front seat, a servo motor is installed at the side end of the screw rod front seat, and the output end of the servo motor is connected with the ball screw assembly through a shaft coupling.

[0015] As a preferred scheme of the present application, a long groove is arranged on the swing arm, a balance block is slidably connected in the long groove, and a proximity switch sensing sheet is fixedly connected on the joint seat.

[0016] As a preferred scheme of the present application, the rack is provided with a first connecting seat, a first mounting seat is installed on the first connecting seat, and a rear proximity switch is fixedly connected on the first mounting seat.

[0017] As a preferred scheme of the present application, the rack is provided with a second connecting seat, a second mounting seat is installed on the second connecting seat, and a front proximity switch is fixedly connected on the second mounting seat.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the present application has the following advantages:

[0020] (1) The scheme has the functions of measuring the size and direction of the metal wire speed, can control the stability of the wire cutting speed, controls the length of the metal wire back and forth by monitoring the change of the wire diameter, is fully automated, stable and reliable in performance, reasonable in structure layout, and convenient to install and maintain.

[0021] (2) In this scheme, A and B are horizontal and vertical sections of the diamond metal wire, the single arrow in the figure indicates the direction of the back-and-forth movement of the metal wires A and B, the double arrow indicates the horizontal movement direction of the wire wheel body, the angle between the metal wire B and the vertical plane is α, and the rotation angle of the swing angle encoder is β.

[0022] (3) In this scheme, the balance block can move in the swing arm and the long slot, and the weight of the wire wheel shaft and the coupling fixing pin and the speed encoder is balanced by changing the length of the force arm, so that the wire wheel body is always in a vertical state without external force, that is, the plane formed by the outer wire groove circle of the wire wheel body is in a vertical state, and the plane formed by the metal wires A and B is the same plane.

[0023] (4) In this scheme, the outer wire groove plane of the wire wheel body, that is, the plane formed by the metal wires A and B, coincides with the center line of the rotating shaft.

[0024] (5) In this scheme, when the take-up roller is not shown in the figure, the diameter will become larger and larger, at which time the angle α between the metal wire B and the vertical plane will become larger, the swing arm drives the swing angle encoder to rotate an angle β, and the diameter change of the take-up roller can be calculated by measuring the size of the angle β, and the length of the metal wire B wound on the take-up roller can also be calculated.

[0025] (6) In this scheme, the metal wires A and B are wound on the outer wire groove of the wire wheel body, and the speed of the back-and-forth movement of the metal wires A and B can be indirectly measured by the speed encoder, and the diameter of the take-up roller is combined with the swing angle encoder to adjust the rotating speed of the take-up roller, so that the speed of the back-and-forth movement of the metal wires A and B remains constant.

[0026] (7) In this scheme, the wire wheel body is connected with the linear guide assembly through the swing arm, the rotating shaft, the connecting seat, and the linear guide assembly, and the servo motor pushes the linear movement in the direction of the double arrow as shown in the figure through the ball screw assembly, and the movement stroke depends on the width of the winding range in the axial direction of the take-up roller which is not shown in the figure.

[0027] (8) In this scheme, the installation positions of the first mounting seat and the second mounting seat can be adjusted on the first connecting seat and the second connecting seat respectively to adapt to the winding width on the take-up roller.

[0028] (9) In this scheme, the rear proximity switch and the front proximity switch are respectively installed on the first mounting seat and the second mounting seat, and when the proximity sensor sheet installed on the connecting seat approaches the rear proximity switch and the front proximity switch, a signal will be sent, which can be used as a zero position or a stroke limit alarm. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic diagram of a multi-wire cutting machine wiring assembly.

[0030] Explanation of reference numerals in the figure:

[0031] 1, line wheel body; 2, line wheel shaft; 3, swing arm; 4, counterweight; 5, connecting seat; 6, swing angle encoder; 7, linear guide assembly; 8, screw rear seat; 9, rear proximity switch; 10, first connecting seat; 11, first mounting seat; 12, ball screw assembly; 13, proximity switch sensing sheet; 14, second connecting seat; 15, front proximity switch; 16, second mounting seat; 17, screw front seat; 18, servo motor; 19, coupling fixing pin; 20, speed encoder; 21, rotating shaft. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] Embodiment:

[0034] Please refer to Figure 1 A multi-wire cutting machine wiring assembly, comprising a rack, the rack is provided with a linear guide assembly 7, the linear guide assembly 7 is provided with a connecting seat 5, the connecting seat 5 is fixedly connected to the sliding block of the linear guide assembly 7, the outer side of the connecting seat 5 is provided with a swing angle encoder 6 and a speed encoder 20, the connecting seat 5 is provided with a mounting mechanism, the mounting mechanism is connected with the swing angle encoder 6 and the speed encoder 20, the outer side of the connecting seat 5 is provided with a wire guide mechanism, and the wire guide mechanism is connected with the mounting mechanism.

[0035] In this embodiment, the linear guide rail assembly 7 is not shown in the rack diagram, the connecting seat 5 is used to fix the slider on the linear guide rail assembly 7, the installation mechanism is used to install the swing angle encoder 6 and the speed encoder 20, the wire guide mechanism is used to slide with the metal wire, the present application has the functions of measuring the size and direction of the metal wire speed, can control the stability of the wire cutting speed, controls the length of the metal wire back and forth by monitoring the change of the wire diameter, all actions are automatic, the performance is stable and reliable, the structure layout is reasonable, the installation and maintenance are convenient, the swing angle encoder 6 measures the rotational position of the load relative to the shaft or point. The angle encoder provides an output corresponding to the displacement, and the reading device (PLC, counter, etc.) processes the data as an angle reading; the speed encoder 20 is generally associated with the shaft, the pulse quantity of the speed encoder is fixed, when the shaft rotates, the speed encoder will output pulses, the PLC or counter receives the pulses, according to the different speeds of the shaft rotation, the total amount of pulses received in unit time is different, the speed is reflected here, according to the pulse quantity and the actual length of rotation, the real speed (m / min) can be calculated.

[0036] Specifically, the installation mechanism includes an installation assembly and a fixing assembly, both of which are arranged on the connecting seat 5, and the installation assembly and the fixing assembly are connected.

[0037] In this embodiment, the installation mechanism includes an installation assembly and a fixing assembly, both of which are arranged on the connecting seat 5, and the installation assembly and the fixing assembly are connected.

[0038] Specifically, the installation assembly includes a swing arm 3 and a rotating shaft 21, the rotating shaft 21 is fixedly connected in the connecting seat 5, the left end of the rotating shaft 21 is fixedly connected with the swing angle encoder 6, the swing arm 3 is fixedly connected to the right end of the rotating shaft 21, and the speed encoder 20 is arranged on the swing arm 3; the swing arm 3 includes a first swing arm segment and a second swing arm segment, the output end of the rotating shaft 21 is connected between the first end and the second end of the first swing arm segment, the balance block 4 is arranged on the first swing arm segment between the first end of the rotating shaft 21 and the output end of the rotating shaft, the second end of the first swing arm segment is connected with the first end of the second swing arm segment, the second end of the second swing arm segment extends obliquely downward, and the second end of the second swing arm segment is connected with the wire guide mechanism.

[0039] In this embodiment, the installation assembly includes a swing arm 3 and a rotating shaft 21, the rotating shaft 21 is fixedly connected in the connecting seat 5, the left end of the rotating shaft 21 is fixedly connected with the swing angle encoder 6, the swing arm 3 is fixedly connected to the right end of the rotating shaft 21, and the speed encoder 20 is arranged on the swing arm 3, the swing arm 3 is used to install the wire shaft 2, and the long slot is also used to install the wire shaft 2, and the rotating shaft 21 is used to install the swing angle encoder 6.

[0040] Specifically, the fixing assembly includes two coupling fixing pins 19, which are arranged on the connecting seat 5 and the swing arm 3 respectively, and the connecting seat 5 and the swing angle encoder 6 are fixedly connected through one coupling fixing pin 19, and the swing arm 3 and the speed encoder 20 are fixedly connected through the other coupling fixing pin 19.

[0041] In this embodiment, the fixing assembly includes two coupling fixing pins 19, which are arranged on the connecting seat 5 and the swing arm 3 respectively, and the connecting seat 5 and the swing angle encoder 6 are fixedly connected through one coupling fixing pin 19, and the swing arm 3 and the speed encoder 20 are fixedly connected through the other coupling fixing pin 19, and the two coupling fixing pins 19 are used to fix the connecting seat 5 and the swing angle encoder 6 together, and fix the swing arm 3 and the speed encoder 20 together.

[0042] Specifically, the wire guide mechanism includes a wire wheel body 1 and a wire wheel shaft 2, and the wire wheel shaft 2 is installed on the swing arm 3, and the wire wheel body 1 is fixedly connected to the surface of the wire wheel shaft 2.

[0043] In this embodiment, the wire guide mechanism includes a wire wheel body 1 and a wire wheel shaft 2, and the wire wheel shaft 2 is installed on the swing arm 3, and the wire wheel body 1 is fixedly connected to the surface of the wire wheel shaft 2, and the wire wheel shaft 2 is used to fix the wire wheel body 1, and the wire wheel body 1 is used to wind the metal wires A and B on the outer wire groove of the wire wheel body 1, so that the speed of the back-and-forth movement of the metal wires A and B and the direction can be indirectly measured by the speed encoder 20, and then combined with the diameter of the winding roller measured by the swing angle encoder 6 to adjust the rotating speed of the winding roller, so that the speed of the back-and-forth movement of the metal wires A and B remains constant.

[0044] Specifically, the outer wire groove plane of the wire wheel body 1 coincides with the center line of the rotating shaft 21.

[0045] In this embodiment, the outer wire groove plane of the wire wheel body 1 coincides with the center line of the rotating shaft 21, and the outer wire groove plane of the wire wheel body 1, i.e., the plane formed by the metal wires A and B, coincides with the center line of the rotating shaft 21.

[0046] Specifically, the rack is provided with a screw rod rear seat 8 and a screw rod front seat 17, a ball screw assembly 12 is installed between the screw rod rear seat 8 and the screw rod front seat 17, a servo motor 18 is installed at the side end of the screw rod front seat 17, and the output end of the servo motor 18 is connected with the ball screw assembly 12 through a shaft coupling.

[0047] In this embodiment, the rack is provided with a screw rod rear seat 8 and a screw rod front seat 17, a ball screw assembly 12 is installed between the screw rod rear seat 8 and the screw rod front seat 17, a servo motor 18 is installed at the side end of the screw rod front seat 17, and the output end of the servo motor 18 is connected with the ball screw assembly 12 through a shaft coupling; the screw rod rear seat 8 and the screw rod front seat 17 are used for facilitating the installation of the ball screw assembly 12, and the screw rod front seat 17 is used for facilitating the installation of the servo motor 18; the servo motor 18 is fixedly connected with the ball screw assembly 12 through the shaft coupling, which is not shown in the figure, and the ball screw assembly 12 is driven to rotate by the servo motor 18, and the linear movement of the ball screw assembly 12 in the direction of the double-headed arrow as indicated is driven by the servo motor 18, and the movement stroke depends on the width of the winding range of the winding roller shaft, which is not shown in the figure.

[0048] Specifically, a long slot is formed in the swing arm 3, and a balance block 4 is slidably connected in the long slot. The connecting seat 5 is fixedly connected with a proximity switch sensing piece 13.

[0049] In this embodiment, a long slot is formed in the swing arm 3, and a balance block 4 is slidably connected in the long slot. The connecting seat 5 is fixedly connected with a proximity switch sensing piece 13. The long slot is formed to facilitate the sliding connection of the balance block 4. The balance block 4 can move in the swing arm 3 and the long slot. By changing the length of the force arm, the weight of the wire wheel shaft 2, the connecting fixed pin 19 and the speed encoder 20 is balanced, so that the wire wheel body 1 is always in a vertical state without external force. The proximity switch sensing piece 13 is used in cooperation with the rear proximity switch 9 and the front proximity switch 15.

[0050] Specifically, a first connecting seat 10 is arranged on the rack, a first mounting seat 11 is installed on the first connecting seat 10, and a rear proximity switch 9 is fixedly connected to the first mounting seat 11.

[0051] In this embodiment, a first connecting seat 10 is arranged on the rack, a first mounting seat 11 is installed on the first connecting seat 10, and a rear proximity switch 9 is fixedly connected to the first mounting seat 11. The first connecting seat 10 is used to facilitate the installation of the first mounting seat 11. The position of the first mounting seat 11 on the first connecting seat 10 is adjusted through the first connecting seat 10 to adapt to the winding width of the winding roller. When the proximity switch sensing piece 13 installed on the connecting seat 5 approaches the rear proximity switch 9, a signal will be sent. This signal can be used as a reference point positioning or a travel limit alarm.

[0052] Specifically, a second connecting seat 14 is arranged on the rack, a second mounting seat 16 is installed on the second connecting seat 14, and a front proximity switch 15 is fixedly connected to the second mounting seat 16.

[0053] In the embodiment, the second connecting seat 14 is arranged on the frame, the second mounting seat 16 is mounted on the second connecting seat 14, and the front proximity switch 15 is fixedly connected to the second mounting seat 16. The second connecting seat 14 is arranged to facilitate mounting of the second mounting seat 16, so that the position of the second mounting seat 16 on the second connecting seat 14 can be adjusted to adapt to the winding width on the winding roller. When the proximity switch sensing piece 13 mounted on the connecting seat 5 approaches the front proximity switch 15, a signal will be sent. The signal can be used as a home position or a travel limit alarm.

[0054] Working principle: At the beginning of work, generally, α=0 or at the maximum value, the proximity switch sensing piece 13 is close to the rear proximity switch 9 or the front proximity switch 15, during work, the servo motor 18 drives the metal wires A and B to move back and forth between the rear proximity switch 9 and the front proximity switch 15 through the ball screw assembly 12, the connecting seat 5 and the wire reel body 1, at this time, the metal wire B moves downward and is wound on the winding roller, α and β gradually increase, on the contrary, the metal wire B moves upward and is unwound from the winding roller, α and β gradually decrease, the amount of the metal wire on the winding roller and the winding diameter can be calculated through the swing angle encoder 6, so as to control the length of the metal wire moving back and forth and keep the constant speed of the back and forth movement; the balance block 4 can move in the swing arm 3 and the long slot, the length of the force arm is changed to balance the weight of the wire reel shaft 2, the connecting and fixing pin 19 and the speed encoder 20, so that the wire reel body 1 is always in the vertical state without external force, that is, the plane formed by the outer wire groove circle of the wire reel body 1 is in the vertical state and the plane formed by the metal wires A and B is the same plane; the outer wire groove plane of the wire reel body 1, that is, the plane formed by the metal wires A and B, coincides with the center line of the rotating shaft 21; when the winding roller is not shown in the figure, the diameter becomes larger and larger, at this time, the angle α between the metal wire B and the vertical plane becomes larger, the swing arm 3 drives the swing angle encoder 6 to rotate an angle β, the diameter change of the winding roller can be calculated by measuring the size of the angle β, and the length of the metal wire B wound on the winding roller can also be calculated; the back and forth movement speed and direction of the metal wires A and B can be indirectly measured through the speed encoder 20, and the diameter of the winding roller is combined with the diameter of the winding roller to adjust the rotating speed of the winding roller, so that the back and forth movement speed of the metal wires A and B is kept constant; the wire reel body 1 is connected with the linear guide assembly 7 through the swing arm 3, the rotating shaft 21, the connecting seat 5, and is pushed to move linearly in the direction of the double arrow as shown in the figure by the servo motor 18 through the ball screw assembly 12, the moving stroke depends on the width of the winding range in the axial direction of the winding roller which is not shown in the figure; the installation positions of the first mounting seat 11 and the second mounting seat 16 can be adjusted on the first connecting seat 10 and the second connecting seat 14 respectively to adapt to the winding width on the winding roller; the rear proximity switch 9 and the front proximity switch 15 are respectively installed on the first mounting seat 11 and the second mounting seat 16, when the proximity switch sensing piece 13 installed on the connecting seat 5 approaches the rear proximity switch 9 and the front proximity switch 15, a signal will be sent, which can be used as the original point positioning or the travel limit alarm.

[0055] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the improved concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A wiring assembly for a multi-wire cutting machine, comprising a frame, characterized in that: The frame is provided with a linear guide rail assembly (7), and the linear guide rail assembly (7) is provided with a connecting seat (5). The connecting seat (5) is fixedly connected to the slider of the linear guide rail assembly (7). The outer side of the connecting seat (5) is provided with a swing angle encoder (6) and a speed encoder (20). The connecting seat (5) is provided with a mounting mechanism, which is connected to the swing angle encoder (6) and the speed encoder (20). The outer side of the connecting seat (5) is provided with a wire guide mechanism, which is connected to the mounting mechanism. The installation mechanism includes an installation component and a fixing component, both of which are mounted on a connecting base (5) and are connected to each other. The mounting assembly includes a swing arm (3) and a rotating shaft (21). The rotating shaft (21) is fixedly connected to the connecting seat (5). The left end of the rotating shaft (21) is fixedly connected to the swing angle encoder (6). The swing arm (3) is fixedly connected to the right end of the rotating shaft (21). The speed encoder (20) is mounted on the swing arm (3). When the winding roller is not winding, the diameter will become larger and larger. At this time, the angle α between the metal wire B and the vertical plane will become larger. The swing arm (3) drives the swing angle encoder (6) to rotate by an angle β. By measuring the size of the angle β, the change in the diameter of the winding roller can be calculated, and the length of the metal wire B wound on the winding roller can also be calculated. The metal wires A and B are wound on the outer groove of the wheel body. The speed encoder (20) can indirectly measure the speed and direction of the back-and-forth movement of the metal wires A and B. Combined with the diameter of the winding roller measured by the swing angle encoder (6), the rotation speed of the winding roller is adjusted so that the speed of the back-and-forth movement of the metal wires A and B remains constant.

2. The wiring assembly for a multi-wire cutting machine according to claim 1, characterized in that: The fixing component includes a connecting fixing pin (19), and there are two connecting fixing pins (19). The two connecting fixing pins (19) are respectively set on the connecting seat (5) and the swing arm (3). The connecting seat (5) and the swing angle encoder (6) are fixedly connected by one connecting fixing pin (19), and the swing arm (3) and the speed encoder (20) are fixedly connected by the other connecting fixing pin (19).

3. The wiring assembly for a multi-wire cutting machine according to claim 2, characterized in that: The wire guide mechanism includes a spool body (1) and a spool shaft (2). The spool shaft (2) is mounted on a swing arm (3), and the spool body (1) is fixedly connected to the surface of the spool shaft (2).

4. The wiring assembly for a multi-wire cutting machine according to claim 3, characterized in that: The outer groove plane of the reel body (1) coincides with the center line of the rotating shaft (21).

5. The wiring assembly for a multi-wire cutting machine according to claim 4, characterized in that: The frame is provided with a lead screw rear seat (8) and a lead screw front seat (17). A ball screw assembly (12) is installed between the lead screw rear seat (8) and the lead screw front seat (17). A servo motor (18) is installed on the side end of the lead screw front seat (17). The output end of the servo motor (18) is connected to the ball screw assembly (12) through a coupling.

6. The wiring assembly for a multi-wire cutting machine according to claim 5, characterized in that: The swing arm (3) has a long groove, and a balance block (4) is slidably connected in the long groove. A proximity switch sensor (13) is fixedly connected to the connecting seat (5).

7. The wiring assembly for a multi-wire cutting machine according to claim 6, characterized in that: The frame is provided with a first connecting seat (10), and a first mounting seat (11) is installed on the first connecting seat (10). A rear proximity switch (9) is fixedly connected to the first mounting seat (11).

8. The wiring assembly for a multi-wire cutting machine according to claim 7, characterized in that: The frame is provided with a second connecting seat (14), and a second mounting seat (16) is installed on the second connecting seat (14). A front proximity switch (15) is fixedly connected to the second mounting seat (16).

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