Alternate irrigation equipment for water conservancy project

Abstract

The invention relates to the technical field of water conservancy irrigation, in particular to alternative irrigation equipment for a water conservancy project, which comprises a water conservancy irrigation main canal, a sealing filling assembly and a reinforced sealing assembly, and is characterized in that the sealing filling assembly is arranged at the bottom in a guide chute of a closure mounting frame; when the closure flashboard is far away from the alternate diversion hole and the water conservancy irrigation main canal and the alternate irrigation branch canal are communicated, the elastic filling air bag is inflated and expanded, at the moment, the elastic filling air bag can fill the position, prone to sediment accumulation, of the inner bottom of the guide sliding groove, and sediment accumulation caused by water flow is avoided; in addition, under the matching effect of the reinforcing sealing assembly, when the intercepting gate plate intercepts the alternate flow dividing holes, the reinforcing sealing assembly can be matched with the elastic filling air bag to seal the bottom of the intercepting gate plate and reinforce sealing of the four side faces of the intercepting gate plate, and the using stability of the intercepting mounting frame is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy and irrigation, in particular to alternating irrigation equipment for water conservancy projects. Background Art

[0002] Alternating irrigation is a water-saving irrigation strategy that changes the traditional irrigation method and allows the soil in the crop root zone to alternately remain wet and dry at different times, thereby improving water use efficiency and promoting crop growth.

[0003] The invention of the existing publication number CN118166731B discloses a component of a water storage gate valve for an agricultural irrigation water conservancy project, including a blocking gate plate, which is rotatably connected to the inside of a control gate. When the diversion component, the control gate and the blocking gate plate are used in coordination, three-way water diversion irrigation can be achieved, namely, independent use of the left and right water diversion holes and the opening of the control gate. The use is convenient and flexible, and the flow direction of the water body and the irrigation direction can be directionally controlled. The use can be adapted to different agricultural irrigation conditions, and the problem that the gate plate of the existing water storage gate is a single-plate design and does not have a diversion structure, which causes the water body to flow into the entire channel after the gate plate / gate is opened and cannot be used for directional irrigation is solved. When the above scheme is used, two water diversion holes and a gate plate are set for water diversion. When used in an alternating irrigation process, there will be a certain drop between the gate plate used for interception and the bottom of the canal. After long-term water use, a lot of silt and dirt will accumulate in the sinking groove, which may affect the effect of the later use of the interception gate plate. Summary of the invention

[0004] The object of the present invention is to provide an alternating irrigation device for water conservancy projects to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: an alternating irrigation device for water conservancy projects, comprising:

[0006] A water conservancy irrigation main channel, wherein a building base is provided on one side of the water conservancy irrigation main channel, an alternating irrigation branch channel is provided on one side of the water conservancy irrigation main channel close to the building base, the two alternating irrigation branch channels respectively penetrate the building base and have alternating diversion holes, the building base is located on both sides of the alternating diversion holes and is respectively provided with two interception components, the interception components include an interception mounting frame and an interception gate, and the interception gate is movably arranged in the interception mounting frame;

[0007] A sealing filling component, wherein a guide slot is provided in the interception mounting frame, and the sealing filling component comprises an elastic filling airbag and two side air storage boxes, wherein the two side air storage boxes are respectively located at two sides of the guide slot, and the elastic filling airbag is horizontally arranged at the lower end of the guide slot, and the lower end and two sides of the interception gate are respectively in contact with the elastic filling airbag and the two side air storage boxes;

[0008] The reinforced sealing assembly comprises four reinforced sealing plates, and the four reinforced sealing plates are respectively arranged on four sides of the intercepting gate through the regulating assembly, and the adjusting assembly comprises a T-shaped movable plate and two synchronous control strips.

[0009] Preferably, the lower end of the inner circle of the intercepting mounting frame is flush with the inner bottom surface of the water conservancy irrigation main channel and the alternating irrigation branch channel, and the vertical cross-sectional area of ​​the intercepting gate is larger than the vertical cross-sectional area of ​​the alternating diversion hole.

[0010] Preferably, the lower end and both sides of the intercepting gate are respectively inserted into the guide slide grooves, the elastic filling airbag is arranged in a U-shaped structure, and hard mounting boxes are provided at the upper ends of both sides of the elastic filling airbag. The two hard mounting boxes are respectively connected to the lower ends of the two side air storage boxes, and the two hard mounting boxes are respectively higher than the bottom surfaces of the water conservancy irrigation main channel and the alternating irrigation branch channel.

[0011] Preferably, a piston air groove is vertically opened at the upper end of the side air storage box, a transfer groove is opened below the piston air groove in the side air storage box, and connecting plugs are provided at the upper ends of the two hard mounting boxes of the elastic filling airbag, and the two connecting plugs are respectively connected to the two transfer grooves.

[0012] Preferably, extension plates are horizontally provided on the upper ends of both sides of the shut-off gate plate, piston connecting rods are vertically provided on the lower ends of the two extension plates, the two piston connecting rods are movably inserted into the piston air grooves respectively, and the lower ends of the piston connecting rods placed in the piston air grooves are provided with air push pistons.

[0013] Preferably, a connecting groove is provided at the lower end of the piston connecting rod through the air pushing piston, and the connecting groove is located at the upper end of the air pushing piston and is connected to a plurality of air inlet holes. A spiral hose is connected to the lower end of the connecting groove through a connecting plug, and the lower end of the spiral hose is connected to one side of the adapter groove.

[0014] Preferably, a U-shaped control groove is opened at the upper end of the shut-off gate, a T-shaped movable plate is horizontally movably arranged in the U-shaped control groove, a control screw is vertically arranged at the center of the upper end of the T-shaped movable plate, the upper end of the control screw vertically moves through the shut-off gate, a threaded control seat is rotatably provided at the center of the upper end of the shut-off mounting frame through a bearing seat, and the upper end of the control screw is arranged through a threaded control seat.

[0015] Preferably, a spring groove is provided in the U-shaped control groove near the lower end of the protrusion of the T-shaped movable plate, and a plurality of support springs are vertically symmetrically provided in the spring groove, and the upper ends of the support springs are respectively connected to the lower ends of the protrusions of the T-shaped movable plate.

[0016] Preferably, synchronization control strips are vertically provided at both ends of the T-shaped movable plate, and strip mounting grooves are respectively opened on the four sides of the shut-off gate plate close to the two synchronization control strips, and the four reinforced sealing plates are respectively vertically inserted into the four strip mounting grooves, and one side of the four reinforced sealing plates respectively extends out of the strip mounting groove and is squeezed into contact with the inner wall of the guide slide groove.

[0017] Preferably, a plurality of spring boxes are symmetrically provided on one side of the U-shaped control groove close to the synchronous control strip, and a push rod is movably inserted in each of the plurality of spring boxes through a constraint pressure block, and both sides of the push rod are respectively inserted into the U-shaped control groove and the strip mounting groove, and one side of the push rod located in the strip mounting groove is fixedly connected to one side of the reinforced sealing plate, and a return spring is sleeved on one side of the constraint pressure plate located in the spring box, and a push block is provided on one side of the synchronous control strip close to the push rod, and a side surface of the lower end of the push block is an inclined surface, and one side of the push rod is in contact with the push block.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] A sealing filling component is arranged at the bottom of the guide chute of the intercepting mounting frame. Through the self-activity cooperation of the intercepting gate, the elastic filling airbag can be inflated when the intercepting gate is away from the alternating diversion hole and the main irrigation channel and the alternating irrigation branch channel are connected. At this time, the elastic filling airbag can fill the position where sediment is easily accumulated at the bottom of the guide chute to avoid sediment accumulation caused by water flow, and the surrounding sediment can be directly prevented from being directly washed away from the elastic filling airbag. In addition, with the cooperation of the enhanced sealing component, when the intercepting gate intercepts the alternating diversion hole, the elastic filling airbag can be used to seal the bottom of the intercepting gate, and the four sides of the intercepting gate can be strengthened to seal, thereby improving the stability of the intercepting mounting frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention from a first viewing angle;

[0021] Figure 2 It is a schematic diagram of the structure of the present invention from a second viewing angle;

[0022] Figure 3 This is a schematic diagram of the structure of the interception mounting frame of the present invention;

[0023] Figure 4 It is a schematic diagram of the side section structure of the intercepting gate installation of the present invention;

[0024] Figure 5 For the present invention Figure 4 Schematic diagram of part A;

[0025] Figure 6 For the present invention Figure 4 Schematic diagram of part B;

[0026] Figure 7 This is a schematic diagram of the installation structure of the elastic filling airbag of the present invention;

[0027] Figure 8 It is a schematic diagram of the partial side-cut structure of the closure gate of the present invention;

[0028] Fig. 9 For the present invention Figure 8 Schematic diagram of the C part;

[0029] Fig.10 This is a schematic diagram of the installation structure of the synchronous control strip of the present invention;

[0030] Fig.11 For the present invention Fig.10 Schematic diagram of part D.

[0031] In the figure: water conservancy irrigation main channel 1, building base 2, alternating irrigation branch channel 3, alternating diversion hole 4, interception mounting frame 5, guide slide 6, interception gate 7, side air storage box 8, piston air groove 9, piston connecting rod 10, push air piston 11, elastic filling air bag 12, adapter groove 13, spiral hose 14, connection groove 15, air inlet hole 16, connection plug 17, U-shaped control groove 18, T-shaped movable plate 19, spring groove 20, support spring 21, control screw 22, threaded control seat 23, synchronous control strip 24, strip mounting groove 25, spring box 26, push rod 27, return spring 28, reinforced sealing plate 29, push block 30. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0033] Please refer to the attached Figure 1-11 , this application provides the following technical solutions.

[0034] Embodiment 1: An alternating irrigation device for a water conservancy project comprises a main water conservancy irrigation channel 1, a building base 2 is provided on one side of the main water conservancy irrigation channel 1, an alternating irrigation branch channel 3 is provided on one side of the main water conservancy irrigation channel 1 close to the building base 2, two alternating irrigation branch channels 3 respectively penetrate the building base 2 and have alternating diversion holes 4, the building base 2 is respectively provided with two interception components on both sides of the alternating diversion holes 4, the interception components comprise an interception mounting frame 5 and an interception gate 7, the interception gate 7 is movably provided in the interception mounting frame 5, and the interception mounting frame 5 The lower end of the inner circle is flush with the inner bottom surface of the water conservancy irrigation main channel 1 and the alternating irrigation branch channel 3. The vertical cross-sectional area of ​​the intercepting gate plate 7 is larger than the vertical cross-sectional area of ​​the alternating diversion hole 4. When the irrigation water in the water conservancy irrigation main channel 1 enters the two alternating irrigation branch channels 3 respectively from the two alternating diversion holes 4, the water diversion and subsequent alternating irrigation can be realized. When the intercepting gate plate 7 is at the lowest position in the intercepting mounting frame 5, the alternating diversion hole 4 is intercepted. When the intercepting gate plate 7 is at the highest position in the intercepting mounting frame 5, the alternating diversion hole 4 is in a normal flow state.

[0035] A sealing filling component is set to fill the guide chute 6 below the bottom surface of the water conservancy irrigation main channel 1 and the alternating irrigation branch channel 3 after the intercepting gate plate 7 is lifted. At the same time, it can be sealed when the intercepting gate plate 7 is used for interception. A guide chute 6 is opened in the intercepting mounting frame 5. The sealing filling component includes an elastic filling airbag 12 and two side air storage boxes 8. The two side air storage boxes 8 are respectively located on both sides of the guide chute 6. The elastic filling airbag 12 is horizontally arranged at the lower end of the guide chute 6, and the lower end and both sides of the intercepting gate plate 7 are respectively in contact with the elastic filling airbag 12 and the two side air storage boxes 8. The lower end and both sides of the intercepting gate plate 7 are respectively inserted into the guide chute 6. The elastic filling airbag 12 is a U-shaped structure. A hard mounting box is provided at the upper ends of both sides of the inflatable bag 12, and the two hard mounting boxes are respectively connected to the lower ends of the two side air storage boxes 8, and the two hard mounting boxes are respectively higher than the bottom surfaces of the water conservancy irrigation main channel 1 and the alternating irrigation branch channel 3. When the elastic filling airbag 12 is inflated, the elastic filling airbag 12 can fill the bottom of the guide chute 6. At this time, the upper end of the elastic filling airbag 12 can be higher than or flush with the ground of the water conservancy irrigation main channel 1 and the alternating irrigation branch channel 3, so that the silt in the irrigation water flowing from the water conservancy irrigation main channel 1 to the alternating irrigation branch channel 3 will not accumulate at the bottom of the guide chute 6, but can directly flow through the surface of the elastic filling airbag 12, and at the same time, the silt on the surface of the elastic filling airbag 12 will be taken away and cleaned.

[0036] A piston gas groove 9 is vertically opened at the upper end of the side gas storage box 8, and a transfer groove 13 is opened below the piston gas groove 9 in the side gas storage box 8. The upper ends of the two hard mounting boxes of the elastic filling airbag 12 are provided with connecting plugs 17, and the two connecting plugs 17 are respectively connected and plugged into the two transfer grooves 13. Extension plates are horizontally provided at the upper ends of both sides of the shut-off gate 7, and piston connecting rods 10 are vertically provided at the lower ends of the two extension plates. The two piston connecting rods 10 are respectively movably plugged into the piston gas groove 9, and the lower ends of the piston connecting rods 10 placed in the piston gas groove 9 are provided with push pistons 11, and the lower ends of the piston connecting rods 10 are provided with connecting grooves 15 that penetrate the push piston 11, and the connecting grooves 15 are located at the upper ends of the push pistons 11 and are connected to a plurality of air inlet holes 16, and the lower ends of the connecting grooves 15 are connected with a spiral hose 14 through the connecting plug, and the lower ends of the spiral hoses 14 The end is connected with one side of the adapter groove 13. When the shutoff gate 7 rises, the shutoff gate 7 drives the piston connecting rod 10 and the air pushing piston 11 to move synchronously. During the activity, the air above the piston air groove 9 is compressed and enters the adapter groove 13 from the air inlet 16, the connecting groove 15 and the spiral hose 14. Then, as the shutoff gate 7 continues to rise, the air above the piston air groove 9 enters the elastic filling airbag 12 from the adapter groove 13 and the connecting plug 17, so that the elastic filling airbag 12 can fill the bottom of the guide slide groove 6. When the shutoff gate 7 drops to the maximum extent, the elastic filling airbag 12 contracts, and the lower end of the shutoff gate 7 squeezes the elastic filling airbag 12 and is inserted into the lower end of the guide slide groove 6. At this time, the elastically deformed elastic filling airbag 12 can enhance the sealing effect between the shutoff gate 7 and the bottom of the shutoff mounting frame 5.

[0037] Embodiment 2: On the basis of embodiment 1, a reinforced sealing component is provided to strengthen the sealing state between the intercepting gate plate 7 and the vertical side surface of the guide slide groove 6. The reinforced sealing component includes four reinforced sealing plates 29. The four reinforced sealing plates 29 are respectively arranged on the four sides of the intercepting gate plate 7 through the regulating component. The adjustment component includes a T-shaped movable plate 19 and two synchronous control strips 24. A U-shaped control groove 18 is opened at the upper end of the intercepting gate plate 7. The T-shaped movable plate 19 is horizontally movable in the U-shaped control groove 18. A control screw 22 is vertically provided at the center of the upper end of the T-shaped movable plate 19. The upper end of the control screw 22 vertically moves through the intercepting gate plate 7. A threaded control seat 23 is rotatably provided at the center of the upper end of the intercepting mounting frame 5 through a bearing seat, and the upper end of the control screw 22 is arranged by threading through the threaded control seat 23. By rotating the threaded control seat 23, the intercepting gate plate 7 connected to the control screw 22 can be controlled to move up and down.

[0038] A spring groove 20 is provided in the U-shaped control groove 18 near the lower end of the protrusion of the T-shaped movable plate 19, and a plurality of support springs 21 are vertically symmetrically provided in the spring groove 20. The upper ends of the support springs 21 are respectively connected to the lower ends of the protrusions of the T-shaped movable plate 19, and synchronous control strips 24 are vertically provided at both ends of the T-shaped movable plate 19. Strip mounting grooves 25 are respectively provided on the four sides of the shutoff gate 7 near the two synchronous control strips 24. Four reinforced sealing plates 29 are respectively vertically inserted into the four strip mounting grooves 25, and one side of the four reinforced sealing plates 29 respectively extends out of the strip mounting grooves 25 and is in compression contact with the inner wall of the guide slide 6. When the shutoff gate 7 is pressed down and moved, the plurality of support springs 21 can provide support force for the position between the control screw 22 and the shutoff gate 7. At the same time, when the shutoff gate 7 is inserted to the bottom and does not move, the continued descent of the control screw 22 can control the continued descent of the T-shaped movable plate 19 and the two synchronous control strips 24.

[0039] A plurality of spring boxes 26 are symmetrically arranged on one side of the U-shaped control groove 18 near the synchronous control strip 24, and a plurality of spring boxes 26 are provided with push rods 27 movably plugged in through a constraint pressure block. The two sides of the push rod 27 are respectively plugged in the U-shaped control groove 18 and the strip-shaped mounting groove 25, and one side of the push rod 27 located in the strip-shaped mounting groove 25 is fixedly connected to one side of the reinforcing sealing plate 29, and a reset spring 28 is sleeved on one side of the constraint pressure plate of the push rod 27 located in the spring box 26, and a push block 30 is provided on one side of the synchronous control strip 24 near the push rod 27. The push block The lower end side surface of 30 is an inclined surface, and one side of the push rod 27 is in contact with the push block 30. The T-shaped movable plate 19 and the synchronous control strip 24 that continue to descend can push up the plurality of push rods 27 through the plurality of push blocks 30, thereby achieving the effect of strengthening that one end of the sealing plate 29 extends out of the strip mounting groove 25 and squeezes the side wall of the sealing guide slide groove 6. When the push rod 27 and the push block 30 are in contact through the inclined surface, by controlling the degree of descent of the synchronous control strip 24, the extrusion force adjustment between the sealing plate 29 and the side wall of the spring box 26 can be achieved to improve the sealing effect.

[0040] 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. An alternating irrigation device for water conservancy projects, characterized in that: include: A water conservancy irrigation main channel (1), wherein a building base (2) is provided on one side of the water conservancy irrigation main channel (1), and an alternating irrigation branch channel (3) is provided on one side of the water conservancy irrigation main channel (1) close to the building base (2), and the two alternating irrigation branch channels (3) respectively penetrate the building base (2) and are provided with alternating flow diversion holes (4), and the building base (2) is respectively provided with two interception components on both sides of the alternating flow diversion holes (4), and the interception components include an interception mounting frame (5) and an interception gate (7), and the interception gate (7) is movably arranged in the interception mounting frame (5); A sealing filling component, wherein a guide slot (6) is provided in the intercepting mounting frame (5), and the sealing filling component comprises an elastic filling airbag (12) and two side air storage boxes (8), wherein the two side air storage boxes (8) are respectively located on both sides of the guide slot (6), the elastic filling airbag (12) is horizontally arranged at the lower end of the guide slot (6), and the lower end and both sides of the intercepting gate (7) are respectively in contact with the elastic filling airbag (12) and the two side air storage boxes (8); The reinforced sealing assembly comprises four reinforced sealing plates (29), the four reinforced sealing plates (29) are respectively arranged on four sides of the shut-off gate plate (7) through the regulating assembly, and the regulating assembly comprises a T-shaped movable plate (19) and two synchronous control strips (24).

2. The alternating irrigation equipment for water conservancy projects according to claim 1, characterized in that: The lower end of the inner circle of the intercepting mounting frame (5) is flush with the inner bottom surfaces of the main irrigation channel (1) and the alternating irrigation branch channel (3), and the vertical cross-sectional area of ​​the intercepting gate (7) is greater than the vertical cross-sectional area of ​​the alternating diversion hole (4).

3. The alternating irrigation equipment for water conservancy projects according to claim 2, characterized in that: The lower end and both sides of the intercepting gate (7) are respectively inserted into the guide slide groove (6); the elastic filling airbag (12) is arranged in a U-shaped structure; the upper ends of both sides of the elastic filling airbag (12) are provided with hard installation boxes; the two hard installation boxes are respectively connected to the lower ends of the two side air storage boxes (8); and the two hard installation boxes are respectively higher than the bottom surfaces of the water conservancy irrigation main channel (1) and the alternating irrigation branch channel (3).

4. The alternating irrigation equipment for water conservancy projects according to claim 3, characterized in that: A piston gas groove (9) is vertically provided at the upper end of the side gas storage box (8), a transfer groove (13) is provided below the piston gas groove (9) in the side gas storage box (8), and connection plugs (17) are provided at the upper ends of the two hard installation boxes of the elastic filling airbag (12), and the two connection plugs (17) are respectively connected and plugged into the two transfer grooves (13).

5. The alternating irrigation equipment for water conservancy projects according to claim 4, characterized in that: Extension plates are horizontally provided at the upper ends of both sides of the shutoff gate (7), piston connecting rods (10) are vertically provided at the lower ends of the two extension plates, the two piston connecting rods (10) are movably inserted into the piston gas grooves (9) respectively, and the lower ends of the piston connecting rods (10) placed in the piston gas grooves (9) are provided with air push pistons (11).

6. The alternating irrigation equipment for water conservancy projects according to claim 5, characterized in that: The piston connecting rod (10) has a connecting groove (15) at its lower end penetrating the air-pushing piston (11). The connecting groove (15) is located at the upper end of the air-pushing piston (11) and is connected to a plurality of air inlet holes (16). The lower end of the connecting groove (15) is connected to a spiral hose (14) via a connecting plug, and the lower end of the spiral hose (14) is connected to one side of the adapter groove (13).

7. The alternating irrigation equipment for water conservancy projects according to claim 6, characterized in that: A U-shaped control groove (18) is provided at the upper end of the intercepting gate (7), a T-shaped movable plate (19) is horizontally movably arranged in the U-shaped control groove (18), a control screw (22) is vertically arranged at the center of the upper end of the T-shaped movable plate (19), the upper end of the control screw (22) vertically movably penetrates the intercepting gate (7), a threaded control seat (23) is rotatably arranged at the center of the upper end of the intercepting mounting frame (5) through a bearing seat, and the upper end of the control screw (22) is arranged to penetrate the threaded control seat (23) through a thread.

8. The alternating irrigation equipment for water conservancy projects according to claim 7, characterized in that: A spring groove (20) is provided in the U-shaped control groove (18) near the lower end of the protrusion of the T-shaped movable plate (19), and a plurality of support springs (21) are vertically symmetrically arranged in the spring groove (20). The upper ends of the support springs (21) are respectively connected to the lower ends of the protrusions of the T-shaped movable plate (19).

9. The alternating irrigation equipment for water conservancy projects according to claim 8, characterized in that: Both ends of the T-shaped movable plate (19) are vertically provided with synchronous control strips (24), and four sides of the shutoff gate plate (7) close to the two synchronous control strips (24) are respectively provided with strip-shaped mounting grooves (25), and four reinforced sealing plates (29) are respectively vertically inserted into the four strip-shaped mounting grooves (25), and one side of the four reinforced sealing plates (29) respectively extends out of the strip-shaped mounting groove (25) and is in compression contact with the inner side wall of the guide slide groove (6).

10. The alternating irrigation equipment for water conservancy projects according to claim 9, characterized in that: A plurality of spring boxes (26) are symmetrically arranged on one side of the U-shaped control groove (18) close to the synchronous control strip (24), and a push rod (27) is movably inserted in each of the plurality of spring boxes (26) through a constraint pressure block. Both sides of the push rod (27) are respectively inserted into the U-shaped control groove (18) and the strip-shaped installation groove (25), and one side of the push rod (27) located in the strip-shaped installation groove (25) is fixedly connected to one side of the reinforcing sealing plate (29), and one side of the push rod (27) located in the spring box (26) is sleeved with a return spring (28), and a push block (30) is arranged on one side of the synchronous control strip (24) close to the push rod (27), and a side surface of the lower end of the push block (30) is an inclined surface, and one side of the push rod (27) is in contact with the push block (30).

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