Wiring terminal processing equipment

Abstract

The invention relates to the field of terminal machining, in particular to wiring terminal machining equipment which comprises a machining platen, a blanking assembly and a diffusion control assembly, a cold pressing die holder is horizontally and fixedly arranged in the center of the upper end of the machining platen, reciprocating movable seats are horizontally and slidably arranged at the positions, located on the two sides of the cold pressing die holder, of the upper end of the machining platen, and material moving seats are arranged at the upper ends of the reciprocating movable seats; a blanking groove is vertically formed in one side of the cold pressing die base in a penetrating mode, the blanking position of the bare terminal is supported at the position of the blanking groove through a first cushion block and a second cushion block which are movably connected in a combined mode, and after blanking is finished, the diffusion supporting assembly is matched, so that the blanking position of the bare terminal is supported. The position between the two second cushion blocks with blanking waste and the position between the first combination hole and the second combination hole are moved and expanded, the blanking efficiency of the blanking waste is improved, the situation that normal machining is affected due to machine halt caused by material blocking is avoided, and after blanking is finished, through cooperation with reciprocating movement of the reciprocating movable base, the blanking efficiency is improved. And the first cushion block and the second cushion block are reset and pressed, so that the blanking effect is ensured.

Description

Technical Field

[0001] The invention relates to the field of terminal processing, in particular to a terminal processing device. Background Art

[0002] Terminal blocks are an accessory product used to achieve electrical connections. They are classified as connectors in the industry. With the development of the industry, the scope of use of terminal blocks is increasing, and the types are also increasing. Among the common terminal blocks, when copper bare terminals are produced, the copper tubes need to be cut first, and then made into terminal structures through cold pressing equipment; The existing copper bare terminals are mainly composed of a feeding mechanism, a mold mechanism, a position switching mechanism and a grabbing mechanism during cold pressing. After the slit copper tubes are subjected to multiple cold pressings, a specific shape of the terminal will be formed. Before finally moving out of the cold pressing equipment, the excess parts need to be punched out. When punching out the excess parts, waste materials are easily stuck in the mold. During continuous cold pressing and punching processing, the machine needs to be stopped for processing, which affects the processing efficiency. Summary of the invention

[0003] The object of the present invention is to provide a terminal processing device to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a terminal processing device, comprising: A processing table, wherein a cold pressing die seat is fixed horizontally at the center of the upper end of the processing table, and reciprocating seats are horizontally slidably arranged on both sides of the upper end of the processing table located at the cold pressing die seat, and a material transfer seat is arranged at the upper end of the reciprocating seat, and a blanking groove is vertically penetrated on one side of the cold pressing die seat; A punching assembly, wherein the punching assembly is horizontally movable and inserted into the punching groove, the punching assembly comprises two first pads, the two first pads have two sides that are separated from each other and respectively move through the two sides of the cold pressing die seat and contact one side of the reciprocating seat, and the two first pads have two second pads on the opposite sides of the mating assembly, and the mating assembly comprises two first sliders and two second sliders; A diffusion control component is arranged on both sides of the blanking groove in the cold pressing die seat. The diffusion control component includes two control air grooves. One side of the two second sliding blocks is provided with a control push plate, and the two control push plates are respectively connected to one side of the two control air grooves.

[0005] Preferably, two movable guide grooves are provided on both sides of the blanking groove passing through the cold pressing die seat, and a groove is provided horizontally on the side of the movable guide groove close to the reciprocating seat. One side of the first pad block is movably passed through the movable guide groove and inserted into the groove and is provided with a pushing block, one side of the pushing block is in contact with one side of the reciprocating seat, and one side of the pushing block close to the reciprocating seat is an inclined surface, and a yield groove is provided on the side of the reciprocating seat close to the pushing block.

[0006] Preferably, a thickened platform is provided on one side of the first pad placed in the punching groove, the upper end of the thickened platform of the first pad and the upper end of the second pad are flush with the upper end of the cold pressing die seat, and the distance between the thickened platform of the first pad and the inner side edge of the punching groove is greater than the level or length of the first pad.

[0007] Preferably, a sleeve groove is provided on one side of the second pad, and adapting grooves are symmetrically provided on both sides of the thickened platform of the first pad. A second combination hole and a first combination hole are respectively provided in the sleeve groove of the second pad and on one side of the thickened platform of the first pad, and two combination slots are symmetrically provided on both sides of the sleeve groove of the second pad. Matching plug plates are provided in the two adapting grooves of the first pad. When the two matching plug plates of the first pad are fully inserted into the two combination slots of the second pad, the first combination hole and the second combination hole form a circular structure.

[0008] Preferably, first guide grooves are horizontally provided on both sides of the punching groove close to the movable guide groove, first sliders are horizontally provided on one side of the second pad close to the first guide groove, the two first sliders are respectively slidably inserted into the two first guide grooves, second sliders are horizontally provided on one side of the first pad close to the first guide groove, the two second sliders are respectively slidably inserted into the two first guide grooves, and when the side edge of the reciprocating seat abuts against the side edge of the pushing block, one side of the second slider abuts against the first slider through the pad.

[0009] Preferably, a plurality of spring rods are horizontally provided on one side of the first slider close to the second slider, the plurality of spring rods are movable through the second slider and are provided with anti-slip blocks, and the spring rods are located between the anti-slip block and the second slider and are sleeved with adaptive springs.

[0010] Preferably, a second guide groove is opened on one side of the first guide groove, and a control push plate of the second slider is horizontally movably inserted in the second guide groove. A piston sleeve is provided on one side of the second guide groove close to the control air groove, and both sides of the control air groove are respectively connected to the two piston sleeves. A piston rod is provided on the side of the control push plate close to the piston sleeve, and the piston rod is movably inserted in the piston sleeve, and the movable length of the piston rod in the piston sleeve is greater than the movable length of the first slider in the first guide groove.

[0011] Preferably, a synchronous air groove is opened at the lower end of the cold pressing die base, and transfer grooves are vertically provided on both sides of the synchronous air groove. The two transfer grooves are respectively connected to the control air grooves on both sides of the punching groove, and an air delivery groove is opened on the side of the synchronous air groove away from the transfer groove and passes through the cold pressing die base.

[0012] Preferably, the upper ends of both sides of the cold pressing die seat near the punching groove are vertically provided with diverter grooves, and the upper ends of the two diverter grooves are respectively inclined downward to connect with the punching groove and have a plurality of lower blowing holes.

[0013] Preferably, a valve groove is provided on one side of the control air groove away from the transfer groove, and a one-way valve is inserted in the valve groove. The one-way valve includes a valve body, a blocking block and a valve spring. The valve body is connected to the control air groove and the diverter groove and has a valve hole. The blocking block and the valve spring are arranged in the valve body. In a natural state, the blocking block blocks the valve hole of the valve body connected to the control air groove, and the valve spring is in elastic contact with one side of the blocking block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The first pad and the second pad connected in a combined and movable manner are used at the position of the punching groove to support the punching position of the bare terminal. After the punching is completed, the diffusion support component is used to move and expand the position between the two second pads where the punching waste exists and between the first combination hole and the second combination hole, thereby improving the blanking efficiency of the waste after punching and avoiding shutdown caused by blockage that affects normal processing. After the blanking is completed, the reciprocating movement of the reciprocating seat itself is used to reset and tighten the first pad and the second pad to ensure the punching effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of part A; Figure 3 It is a side cut schematic diagram of the cold pressing die base structure of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of part B; Figure 5 For the present invention Figure 4 Schematic diagram of the C part; Figure 6 This is a schematic diagram of the transfer tank connecting gas according to the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the D part; Figure 8 This is a schematic diagram of the cold pressing die base structure of the present invention; Fig. 9 For the present invention Figure 8 Schematic diagram of part E; Fig.10 This is a schematic diagram of the combined structure of the first cushion block and the second cushion block of the present invention; Fig.11 It is a schematic diagram of the split structure of the first cushion block and the second cushion block of the present invention.

[0016] In the figure: processing table 1, cold pressing die seat 2, reciprocating seat 3, material transfer seat 4, punching groove 5, movable guide groove 6, first cushion block 7, second cushion block 8, first combination hole 9, second combination hole 10, combination slot 11, matching plug plate 12, first guide groove 13, first slider 14, second slider 15, spring rod 16, adaptive spring 17, second guide groove 18, control push plate 19, control air groove 20, piston sleeve 21, piston rod 22, transfer groove 23, synchronous air groove 24, air delivery groove 25, diverter groove 26, one-way valve 27, blocking block 28, valve spring 29, lower blowing hole 30, push block 31, and give way groove 32. DETAILED DESCRIPTION

[0017] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 11 , the present invention provides the following technical solutions: Embodiment 1: A terminal processing equipment comprises a processing table 1, a cold pressing die seat 2 is horizontally fixed at the center of the upper end of the processing table 1, a reciprocating seat 3 is horizontally slidably provided on both sides of the upper end of the processing table 1 located on the cold pressing die seat 2, a material transfer seat 4 is provided on the upper end of the reciprocating seat 3, and a punching groove 5 is vertically penetrated on one side of the cold pressing die seat 2. When processing the screw terminal structure of the copper tube, the copper tube is put into the corresponding press forming station in turn through the horizontal reciprocating motion of the reciprocating seat 3 or the grabbing and lifting cooperation with the material transfer seat 4. After multiple press forming is completed, it is moved to the top of the punching groove 5 for punching and shearing, and the waste material falls down, and the finished product falls from one side during the reciprocating movement.

[0019] A punching assembly is set to cut the pressed copper tube moved to the top of the punching groove 5 to make it into two finished bare terminals. The punching assembly is horizontally movably inserted into the punching groove 5. The punching assembly includes two first pads 7. The two first pads 7 are movably inserted into the two sides of the cold pressing die seat 2 and contact one side of the reciprocating seat 3. The two first pads 7 are respectively provided with second pads 8 on the opposite sides of the two first pads 7. The matching assembly includes two first sliders 14 and two second sliders 15. Two movable guide grooves 6 are provided on both sides of the punching groove 5 that penetrate the cold pressing die seat 2. The movable guide grooves 6 are horizontally provided with grooves on the side close to the reciprocating seat 3. One side of the first cushion block 7 is movable and penetrates the movable guide groove 6 into the plug-in groove and is provided with a push block 31. One side of the push block 31 contacts one side of the reciprocating seat 3. The side of the push block 31 close to the reciprocating seat 3 is an inclined surface. A clearance groove 32 is provided on the side of the reciprocating seat 3 close to the push block 31. Through the reciprocating horizontal movement of the reciprocating seat 3, the punching assembly can be horizontally pushed to a predetermined processing position. The design of the clearance groove 32 is that when the reciprocating seat 3 is reset and moved, the clearance groove 32 corresponds to the push block 31. At this time, the clearance groove 32 can extend out of the groove through the movement of the first cushion block 7, and a movable position is reserved for the first cushion block 7 and the second cushion block 8. A thickening platform is provided on one side of the first pad 7 placed in the punching groove 5. The upper end of the thickening platform of the first pad 7 and the upper end of the second pad 8 are flush with the upper end of the cold pressing die seat 2, and the distance between the thickening platform of the first pad 7 and the inner side of the punching groove 5 is greater than the level or length of the first pad 7. When the copper tube is punched, the copper tube is in stable contact with the first pad 7 and the second pad 8. The activity of the first pad 7 is to improve the blanking effect of the waste material at the punching mouth.

[0020] A sleeve groove is provided on one side of the second cushion block 8, and adaption grooves are symmetrically provided on both sides of the thickening platform of the first cushion block 7. A second combination hole 10 and a first combination hole 9 are respectively provided in the sleeve groove of the second cushion block 8 and on one side of the thickening platform of the first cushion block 7. Two combination slots 11 are symmetrically provided on both sides of the sleeve groove of the second cushion block 8, and matching plug plates 12 are provided in the two adaption grooves of the first cushion block 7. When the two matching plug plates 12 of the first cushion block 7 are completely inserted into the two combination slots 11 of the second cushion block 8, the first combination hole 9 and the second combination hole 10 form a circular structure. The circular structure formed by the first combination hole 9 and the second combination hole 10 is the wire connection hole of the bare terminal. The distance between the two second cushion blocks 8 is the position of the waste material cut off by punching and shearing, and according to the process requirements, this position can make the bare terminal cut into an arc; The first guide grooves 13 are horizontally provided on both sides of the punching groove 5 near the movable guide groove 6, the first slider 14 is horizontally provided on the side of the second pad 8 near the first guide groove 13, and the two first sliders 14 are respectively slidably inserted into the two first guide grooves 13, and the second slider 15 is horizontally provided on the side of the first pad 7 near the first guide groove 13, and the two second sliders 15 are respectively slidably inserted into the two first guide grooves 13. When the side of the reciprocating seat 3 abuts against the side of the pushing block 31, one side of the second slider 15 abuts against the first slider 14 through the pad, and the side of the first slider 14 near the second slider 15 is horizontal. A plurality of spring rods 16 are provided, which are movable through the second slider 15 and are provided with anti-slip blocks. The spring rods 16 are located between the anti-slip block and the second slider 15 and are sleeved with adaptive springs 17. In a natural state, the second pad 8 and the first pad 7 are always in a matching state, that is, the first combination hole 9 and the second combination hole 10 always maintain a circular posture. When the first pad 7 moves to one side of the reciprocating seat 3, under the action of the adaptive spring 17, the second pad 8 can be driven to move synchronously, so that the distance between the two second pads 8 becomes larger, so that the middle of the copper tube cut by punching and shearing can fall quickly.

[0021] A diffusion control component is provided to control the movement and dispersion of the first cushion block 7 and the second cushion block 8. The diffusion control component is provided on both sides of the blanking groove 5 in the cold pressing die seat 2. The diffusion control component includes two control air grooves 20. A control push plate 19 is provided on one side of the two second sliders 15. The two control push plates 19 are respectively connected to one side of the two control air grooves 20. A second guide groove 18 is provided on one side of the first guide groove 13. The control push plate 19 of the second slider 15 is horizontally movably inserted into the second guide groove 18. A piston sleeve 21 is provided on one side of the second guide groove 18 close to the control air groove 20. Both sides of the control air groove 20 are respectively connected to the two piston sleeves 21. A piston rod 22 is provided on one side of the control push plate 19 close to the piston sleeve 21. The piston rod 22 is movably inserted into the piston The piston rod 22 is in the piston sleeve 21, and the movable length of the piston rod 22 in the piston sleeve 21 is greater than the movable length of the first slider 14 in the first guide groove 13. When the high-pressure gas is sent into the control gas groove 20, the high-pressure gas pushes the piston rod 22 and the control push plate 19 to move, and then the second slider 15 moves together with the first cushion block 7 to the side of the reciprocating seat 3. When the second slider 15 moves, the second cushion block 8 and the first slider 14 move synchronously under the action of the adaptive spring 17. After the first slider 14 moves, the spring rod 16 abuts against the side of the first guide groove 13, and the second slider 15 and the first cushion block 7 continue to move. At this time, the distance between the two second cushion blocks 8 becomes larger, and the first combination hole 9 and the second combination hole 10 are split at the same time, and the waste left by the punching just now falls more conveniently; A synchronous gas groove 24 is provided at the lower end of the cold pressing die base 2, and transfer grooves 23 are vertically provided on both sides of the synchronous gas groove 24. The two transfer grooves 23 are respectively connected to the control gas grooves 20 on both sides of the blanking groove 5, and a gas delivery groove 25 is provided on the side of the synchronous gas groove 24 away from the transfer groove 23 and penetrates the cold pressing die base 2. High-pressure gas enters through the gas delivery groove 25, and then under the action of the synchronous gas groove 24, the two second cushion blocks 8 and the two first cushion blocks 7 are pushed and controlled at the same time.

[0022] After the copper tube punching is completed, the reciprocating seat 3 resets and slides and cooperates with the material transfer seat 4 to take the material next time. After the reciprocating seat 3 resets and moves, the gap 32 corresponds to the push block 31. At this time, the air delivery groove 25 injects high-pressure gas, and the high-pressure gas enters the two control gas grooves 20 through the synchronous gas groove 24 and the transfer groove 23. Then the two control gas grooves 20 control the four control push plates 19 to slide to both sides. At this time, the second slider 15 drives the first pad 7 and the second pad 8 to move synchronously. Since the movement of the first slider 14 is limited, when the second pad 8 stops moving, the first pad 7 continues to move, so that the distance between the two second pads 8 becomes larger, the first combination hole 9 and the second combination hole 10 are separated, and the waste material just left by the punching falls more conveniently. When the reciprocating seat 3 and the material transfer seat 4 cooperate to move the next copper tube, the reciprocating seat 3 pushes the first pad 7 to squeeze the second pad 8 to the predetermined punching position to maintain the punching mold effect.

[0023] Embodiment 2: On the basis of embodiment 1, the upper ends of both sides of the cold pressing die seat 2 near the punching groove 5 are vertically provided with diverter grooves 26, and the upper ends of the two diverter grooves 26 are respectively inclined downward to connect with the punching groove 5 to open a plurality of lower blowing holes 30, and the side of the control gas groove 20 away from the transfer groove 23 is connected to the diverter groove 26 to open a valve groove, and the valve groove is plugged with a one-way valve 27, the one-way valve 27 includes a valve body, a blocking block 28 and a valve spring 29, the valve body is connected to the control gas groove 20 and the diverter groove 26 to open a valve hole, the blocking block 28 and the valve spring 29 are arranged at In the valve body, the blocking block 28 blocks the valve hole of the valve body connected to the control gas groove 20 in the natural state, and the valve spring 29 elastically contacts one side of the blocking block 28. After the high-pressure gas enters the control gas groove 20 and the first cushion block 7 and the second cushion block 8 are unable to move, the high-pressure gas is continuously input, and the high-pressure gas can push the blocking block 28 of the one-way valve 27 and enter the diverter groove 26, and then blow downward from a plurality of lower blowing holes 30 to between the two second cushion blocks 8, exerting a downward thrust on the heterogeneous waste left by punching, thereby accelerating the blanking effect and quality of the waste.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A terminal processing device, characterized in that: include: A processing table (1), wherein a cold pressing die seat (2) is fixedly disposed horizontally at the center of the upper end of the processing table (1), and reciprocating seats (3) are disposed horizontally and slidably on both sides of the upper end of the processing table (1) located on the cold pressing die seat (2), and a material transfer seat (4) is disposed at the upper end of the reciprocating seat (3), and a punching groove (5) is vertically penetrated through one side of the cold pressing die seat (2); A punching assembly, wherein the punching assembly is horizontally movable and plugged into the punching groove (5), the punching assembly comprises two first pads (7), the two first pads (7) have two sides that are separated from each other and are movable through two sides of the cold pressing die seat (2) and contact one side of the reciprocating seat (3), and the two first pads (7) have two second pads (8) on the opposite sides of the two first pads (7), and the matching assembly comprises two first sliders (14) and two second sliders (15); A diffusion control component is provided on both sides of a blanking groove (5) in a cold pressing die seat (2), the diffusion control component comprising two control air grooves (20), one side of each of the two second sliders (15) being provided with a control push plate (19), the two control push plates (19) being respectively connected to one side of the two control air grooves (20).

2. The terminal processing equipment according to claim 1, characterized in that: Two movable guide grooves (6) are formed on both sides of the blanking groove (5) passing through the cold pressing die seat (2), and grooves are formed horizontally on the side of the movable guide groove (6) close to the reciprocating seat (3). One side of the first cushion block (7) is movable through the movable guide groove (6) and is inserted into the groove and is provided with a push block (31). One side of the push block (31) is in contact with one side of the reciprocating seat (3), and one side of the push block (31) close to the reciprocating seat (3) is an inclined surface. A clearance groove (32) is formed on the side of the reciprocating seat (3) close to the push block (31).

3. The terminal processing equipment according to claim 2, characterized in that: A thickening platform is provided on one side of the first pad (7) placed in the punching groove (5); the upper end of the thickening platform of the first pad (7) and the upper end of the second pad (8) are both flush with the upper end of the cold pressing die seat (2); and the distance between the thickening platform of the first pad (7) and the inner side edge of the punching groove (5) is greater than the level or length of the first pad (7).

4. The terminal processing equipment according to claim 3, characterized in that: A sleeve groove is provided on one side of the second cushion block (8), and matching grooves are symmetrically provided on both sides of the thickened platform of the first cushion block (7). A second combination hole (10) and a first combination hole (9) are respectively provided in the sleeve groove of the second cushion block (8) and on one side of the thickened platform of the first cushion block (7). Two combination slots (11) are symmetrically provided on both sides of the sleeve groove of the second cushion block (8), and matching plug plates (12) are provided in the two matching plug plates (12) of the first cushion block (7). When the two matching plug plates (12) of the first cushion block (7) are completely plugged into the two combination slots (11) of the second cushion block (8), the first combination hole (9) and the second combination hole (10) form a circular structure.

5. The terminal processing equipment according to claim 4, characterized in that: First guide grooves (13) are horizontally provided on both sides of the punching groove (5) near the movable guide groove (6); first sliders (14) are horizontally provided on one side of the second cushion block (8) near the first guide groove (13); the two first sliders (14) are respectively slidably inserted into the two first guide grooves (13); second sliders (15) are horizontally provided on one side of the first cushion block (7) near the first guide groove (13); the two second sliders (15) are respectively slidably inserted into the two first guide grooves (13); when the side edge of the reciprocating seat (3) abuts against the side edge of the pushing block (31), one side of the second slider (15) abuts against the first slider (14) through the cushion block.

6. The terminal processing equipment according to claim 5, characterized in that: A plurality of spring rods (16) are horizontally arranged on one side of the first slider (14) close to the second slider (15); the plurality of spring rods (16) are respectively movable and penetrate the second slider (15) and are provided with anti-slip blocks; the spring rods (16) are located between the anti-slip block and the second slider (15) and are sleeved with adaptive springs (17).

7. The terminal processing equipment according to claim 6, characterized in that: A second guide groove (18) is provided on one side of the first guide groove (13); a control push plate (19) of the second slider (15) is horizontally movably inserted into the second guide groove (18); a piston sleeve (21) is provided on one side of the second guide groove (18) close to the control air groove (20); two sides of the control air groove (20) are respectively connected to the two piston sleeves (21); a piston rod (22) is provided on one side of the control push plate (19) close to the piston sleeve (21); the piston rod (22) is movably inserted into the piston sleeve (21); and a movable length of the piston rod (22) in the piston sleeve (21) is greater than a movable length of the first slider (14) in the first guide groove (13).

8. The terminal processing equipment according to claim 7, characterized in that: A synchronous air groove (24) is provided at the lower end of the cold pressing die seat (2), and transfer grooves (23) are respectively vertically provided on both sides of the synchronous air groove (24). The two transfer grooves (23) are respectively connected to the control air grooves (20) on both sides of the punching groove (5), and an air delivery groove (25) is provided on the side of the synchronous air groove (24) away from the transfer groove (23) and penetrating the cold pressing die seat (2).

9. The terminal processing equipment according to claim 8, characterized in that: The upper ends of both sides of the cold pressing die base (2) close to the punching groove (5) are vertically provided with diverter grooves (26), and the upper ends of the two diverter grooves (26) are respectively inclined downward to connect with the punching groove (5) and are provided with a plurality of lower blowing holes (30).

10. The terminal processing equipment according to claim 9, characterized in that: The control gas groove (20) has a valve groove on one side away from the transfer groove (23) and connected to the diverter groove (26). A one-way valve (27) is inserted in the valve groove. The one-way valve (27) includes a valve body, a blocking block (28) and a valve spring (29). The valve body is connected to the control gas groove (20) and the diverter groove (26) and has a valve hole. The blocking block (28) and the valve spring (29) are arranged in the valve body. In a natural state, the blocking block (28) blocks the valve hole of the valve body connected to the control gas groove (20), and the valve spring (29) is in elastic contact with one side of the blocking block (28).

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