A coal mine goaf water outlet hole air leakage stopping device

Abstract

The present application relates to the technical field of coal mine production, and particularly relates to a coal mine goaf water discharge hole leakage stopping and air stopping device, which comprises a fixing disc, which is fixedly installed at the opening of the water discharge hole; a sealing disc, which is installed below the fixing disc, and a connecting cylinder is fixedly installed above the sealing disc, the top of the connecting cylinder is connected with the bottom of the fixing disc, a sealing space is formed between the fixing disc and the sealing disc, and a first downspout and a second downspout are respectively arranged on the fixing disc and the sealing disc; a sealing assembly, which is used for sealing the first downspout and the second downspout, comprises a first sealing disc and a second sealing disc, which are spaced apart from each other, a connecting shaft is coaxially arranged between the first sealing disc and the second sealing disc, the connecting shaft is slidably installed in the connecting cylinder, the top of the connecting shaft extends out of the first sealing disc, and a lifting assembly is fixedly installed above the fixing disc. The present application can adjust the state of the first downspout and the second downspout according to actual needs, and meet the needs of the water discharge hole under different working states.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine production, in particular to a coal mine goaf water discharge hole air leakage plugging device. BACKGROUND

[0002] In the process of coal mining, due to the space of mining coal seam, the overlying rock loses support, and finally forms a goaf. There are rich hydrogeological conditions in the goaf, and coal mining will destroy these conditions, causing the water pressure in the goaf to rise. In order to prevent the water pressure in the goaf from continuing to rise, make the goaf groundwater be reasonably discharged, and reduce the occurrence of geological disasters, it is necessary to excavate a water discharge hole in the process of coal mining; in order to prevent the water discharge hole from becoming an air leakage channel after drainage, affecting the ventilation system of the mine and the safety production, the coal mine usually uses an air leakage plugging device to close the water discharge hole.

[0003] However, the conventional water discharge hole air leakage plugging device only blocks the water discharge hole, and when it is necessary to drain again, the installed water discharge hole air leakage plugging device needs to be disassembled, which cannot be conveniently and timely opened, and cannot be flexibly adjusted according to the actual coal mine use environment. SUMMARY

[0004] Technical problem

[0005] In view of the above shortcomings of the prior art, the present application provides a coal mine goaf water discharge hole air leakage plugging device, which can effectively solve the problem that the prior art water discharge hole air leakage plugging device only blocks the water discharge hole, and when it is necessary to drain again, the installed water discharge hole air leakage plugging device needs to be disassembled, which cannot be conveniently and timely opened.

[0006] Technical scheme

[0007] To achieve the above purpose, the present application is realized by the following technical scheme:

[0008] The present application provides a coal mine goaf water discharge hole air leakage plugging device, comprising a fixed disc, which is fixedly installed at the opening of the water discharge hole;

[0009] A sealing disc is installed below the fixed disc, a connecting cylinder is fixedly installed on the upper side, the upper side of the connecting cylinder is connected with the bottom of the fixed disc, a sealing space is formed between the fixed disc and the sealing disc, and first and second downcomers are respectively arranged on the fixed disc and the sealing disc;

[0010] A sealing assembly for sealing a first drain hole and a second drain hole includes a first sealing plate and a second sealing plate spaced vertically apart. A connecting shaft is coaxially arranged between the first sealing plate and the second sealing plate. The connecting shaft is slidably installed inside a connecting cylinder. The top of the connecting shaft extends out of the first sealing plate. A lifting assembly for driving the connecting shaft to move up and down is fixedly installed above the fixed plate.

[0011] Furthermore, an extension plate is fixedly installed on the outer side of the fixed plate, and a cylindrical structure that inserts into the drain hole is formed below the fixed plate.

[0012] Furthermore, a mounting bracket is provided on the outer side of the sealing disc, and an annular groove is formed on the outer peripheral surface of the mounting bracket, with a sealing airbag disposed inside the annular groove.

[0013] Furthermore, a sliding piston is fixedly installed on the outer side of the connecting shaft, and the outer peripheral surface of the sliding piston is slidably connected to the inner wall of the connecting cylinder in a sealing manner. A compression space is formed between the connecting shaft and the connecting cylinder, and a connecting pipe is provided at the bottom of the pressurized space. The connecting pipe is used to fill the sealed airbag with gas.

[0014] Both the sliding piston and the connecting pipe are equipped with one-way valves that allow air to flow only from the compression space to the sealing airbag. The sealing airbag is also equipped with an electromagnetic control valve for discharging gas. During the process of sealing the drain hole using the equipment, the sliding piston can compress the air inside the compression space by driving the connecting shaft up and down, allowing high-pressure air to enter the sealing airbag and making the sealing airbag fully inflate, resulting in a better sealing effect.

[0015] Furthermore, guide openings are provided around the connecting cylinder, and connecting arms extending out of the guide openings are fixedly installed around the connecting shaft. The first sealing disc is connected to the connecting shaft through the connecting arms.

[0016] Furthermore, multiple protrusions are fixedly installed on the top of both the first sealing plate and the second sealing plate. The shapes of the protrusions correspond to the shapes of the first drain hole and the second drain hole, respectively. When the first sealing plate and the second sealing plate block the first drain hole and the second drain hole, the protrusions on the top of the first sealing plate and the second sealing plate pass through the first drain hole and the second drain hole, respectively.

[0017] Furthermore, the first sealing plate has a limiting groove on the side of the protruding block, and the fixing plate has a limiting plate for locking in the limiting groove. The side of the limiting plate has a sliding rod for driving the limiting plate to lock in the limiting groove.

[0018] Furthermore, the fixed plate is radially provided with multiple guide grooves, which are used to guide the sliding rod to slide radially on the fixed plate. Each set of limiting plates has two plates, which are installed back to back. An elastic element is provided between the two limiting plates to drive the two limiting plates to move closer to each other. The middle part of the elastic element is fixedly installed inside the guide groove. As each sliding rod moves away from the center of the fixed plate, it drives the two limiting plates of each set of limiting plates to move away from each other, causing the limiting plates to be engaged in the limiting groove.

[0019] Furthermore, a first wedge is provided on the upper end face of the limiting plate, and a second wedge is provided on both sides of the sliding rod. The inclined surfaces of the first wedge and the second wedge are parallel to each other. A pushing component for driving the sliding rod to move away from the center of the fixed plate is provided on the side of the connecting shaft.

[0020] Furthermore, the side of the connecting shaft is provided with multiple mounting slots, and the pushing component is installed inside the mounting slots. The pushing component includes a pushing block and an elastic component. The elastic component is fixedly installed inside the mounting slots, and one end of the elastic component is fixedly connected to the pushing block.

[0021] Beneficial effects

[0022] The technical solution provided by this invention has the following advantages compared with known public technologies:

[0023] In this invention, by setting a fixed plate and a sealing plate inside the drain hole, a sealed space is formed between the fixed plate and the sealing plate after water is introduced between them, which can seal the drain hole and prevent it from becoming an air leakage channel after drainage. At the same time, by setting a first drain hole and a second drain hole on the fixed plate and the sealing plate, and setting a first sealing plate and a second sealing plate below the first drain hole and the second drain hole to close or open them, the state of the first drain hole and the second drain hole can be adjusted according to actual needs during use, and timely adjustment can be made according to actual working needs to meet the needs of the drain hole under different working states.

[0024] In this invention, both the sliding piston and the connecting pipe are equipped with one-way valves that allow air from the compression space to flow into the sealing bladder. The sealing bladder is also equipped with an electromagnetic control valve for discharging gas. During the process of using the equipment to seal the drain hole, the sliding piston can compress the air inside the compression space by driving the connecting shaft to move up and down, allowing high-pressure air to enter the sealing bladder and fully inflate it, resulting in a better sealing effect. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure from an upward angle of the present invention;

[0028] Figure 3 This is a schematic diagram of the overall structure of the sealing assembly of the present invention;

[0029] Figure 4 This is a schematic diagram of the overall structure of the sealing assembly of the present invention;

[0030] Figure 5 This is a schematic diagram of the half-section structure of the present invention;

[0031] Figure 6 This is a half-sectional side view of the present invention;

[0032] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point A;

[0033] Figure 8 This is an exploded view of the top mounting structure of the fixed disk of the present invention;

[0034] Figure 9 For the present invention Figure 8 A magnified schematic diagram of the structure at point B.

[0035] The labels in the diagram represent:

[0036] 1. Fixed plate; 101. First drain hole; 102. Guide groove; 11. Extending plate; 12. Sliding rod; 13. Limiting plate; 14. Elastic element; 2. Connecting cylinder; 201. Guide opening;

[0037] 3. Sealing plate; 301. Second drain hole; 31. Mounting bracket; 32. Sealing airbag; 33. Connecting pipe;

[0038] 4. Sealing assembly; 41. First sealing disc; 4101. Mounting through hole; 42. Second sealing disc; 4201. Limiting groove; 43. Connecting shaft; 4301. Mounting groove; 431. Sliding piston; 4311. One-way valve; 432. Push block; 433. Elastic component;

[0039] 5. Lifting assembly; 51. Hydraulic telescopic rod; 52. Support frame. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] The present invention will be further described below with reference to embodiments.

[0042] When using a leak-proof device for drainage holes in coal mine goaf areas, in order to prevent the drainage holes from becoming air leakage channels after drainage, a leak-proof device is usually used to seal the drainage holes.

[0043] Therefore, this invention provides a device for sealing air leaks in drainage holes in coal mine goaf areas. Its purpose is at least to: by setting a fixed plate 1 and a sealing plate 3 inside the drainage hole, a sealed space is formed between the fixed plate 1 and the sealing plate 3 after water is introduced between them, thus sealing the drainage hole and preventing it from becoming an air leakage channel after drainage; simultaneously, by setting a first drain hole 101 and a second drain hole 301 on the fixed plate 1 and the sealing plate 3, and setting a first sealing plate 41 and a second sealing plate 42 below the first drain hole 101 and the second drain hole 301 to close or open them, the state of the first drain hole 101 and the second drain hole 301 can be adjusted according to actual needs (to close the drainage hole to prevent air leakage or to open it for water drainage), allowing for timely adjustment based on actual working needs and meeting the requirements of different working states of the drainage hole.

[0044] Example: A device for sealing air leaks in drainage holes of coal mine goaf areas, such as... Figures 1-4 As shown, it includes a fixing plate 1, which is fixedly installed at the opening of the drain hole;

[0045] A sealing disc 3 is installed below a fixed disc 1, and a connecting cylinder 2 is fixedly installed on top of it. The top of the connecting cylinder 2 is connected to the bottom of the fixed disc 1, and a sealing space is formed between the fixed disc 1 and the sealing disc 3. The fixed disc 1 and the sealing disc 3 are respectively provided with a first drain hole 101 and a second drain hole 301.

[0046] The sealing assembly 4 is used to seal the first drain hole 101 and the second drain hole 301. It includes a first sealing plate 41 and a second sealing plate 42 that are spaced apart vertically. A connecting shaft 43 is coaxially arranged between the first sealing plate 41 and the second sealing plate 42. The connecting shaft 43 is slidably installed inside the connecting cylinder 2. The top of the connecting shaft 43 extends out of the first sealing plate 41. A lifting assembly 5 for driving the connecting shaft 43 to move up and down is fixedly installed above the fixed plate 1. The lifting assembly 5 includes two hydraulic telescopic rods 51 fixedly installed on both sides of the fixed plate 1. The top of the two hydraulic telescopic rods 51 are connected to a support frame 52. The middle part of the support frame 52 is connected to the connecting shaft 43.

[0047] In this invention, by setting a fixed plate 1 and a sealing plate 3 inside the drain hole, a sealed space is formed between the fixed plate 1 and the sealing plate 3 after water is introduced between them, which can seal the drain hole and prevent it from becoming an air leakage channel after drainage. At the same time, by setting a first drain hole 101 and a second drain hole 301 on the fixed plate 1 and the sealing plate 3, and setting a first sealing plate 41 and a second sealing plate 42 below the first drain hole 101 and the second drain hole 301 to close or open them, the state of the first drain hole 101 and the second drain hole 301 can be adjusted according to actual needs (to close the drain hole to prevent air leakage or to open the drain hole to drain water) during use. This allows for timely adjustment according to actual working needs and meets the needs of the drain hole under different working states. The drain hole is opened to drain water during coal mine drainage and closed to prevent air leakage when not draining.

[0048] Furthermore, such as Figure 1 , Figure 2 As shown, an extension plate 11 is fixedly installed on the outer side of the fixed plate 1, and a cylindrical structure that is inserted into the drain hole is formed below the fixed plate 1.

[0049] The cylindrical part inserted into the drain hole below the fixing plate 1 can easily support the inner wall of the drain hole, preventing the drain hole from collapsing during drainage and ensuring the stability of the fixing plate 1 installation position.

[0050] Furthermore, such as Figure 1 , Figure 2 As shown, a mounting bracket 31 is provided on the outer side of the sealing disc 3, and an annular groove is formed on the outer peripheral surface of the mounting bracket 31. A sealing airbag 32 is provided inside the annular groove.

[0051] In this design, by setting a sealing airbag 32 on the outside of the mounting bracket 31, the sealing airbag 32 directly contacts the inner wall of the drain hole, which can conveniently inject water into the sealed space when sealing the drain hole, thus preventing the water inside the sealed space from flowing out along the outer edge of the mounting bracket 31.

[0052] Furthermore, such as Figure 3 , Figure 4 As shown, a sliding piston 431 is fixedly installed on the outer side of the connecting shaft 43. The outer circumferential surface of the sliding piston 431 is slidably connected to the inner wall of the connecting cylinder 2. A compression space is formed between the connecting shaft 43 and the connecting cylinder 2. A connecting pipe 33 is provided at the bottom of the pressurized space. The connecting pipe 33 is used to fill the sealed airbag 32 with gas.

[0053] Both the sliding piston 431 and the connecting pipe 33 are equipped with one-way valves 4311 that allow air from the compression space to flow into the sealing airbag 32. The sealing airbag 32 is also equipped with an electromagnetic control valve for discharging gas. During the process of sealing the drain hole using the equipment, the sliding piston 431 can compress the air inside the compression space by driving the connecting shaft 43 to move up and down, allowing high-pressure air to enter the sealing airbag 32, making the sealing airbag 32 fully inflated and achieving a better sealing effect.

[0054] Furthermore, such as Figure 5 , Figure 6 As shown, the connecting cylinder 2 is provided with guide openings 201 on all four sides, and the connecting shaft 43 is fixedly installed with connecting arms extending out of the guide openings 201 on all four sides. The first sealing plate 41 is connected to the connecting shaft 43 through the connecting arms.

[0055] When the connecting shaft 43 moves up and down, the connecting arm can easily drive the first sealing plate 41 to move up and down. The guide opening 201 can restrict the connecting arm so that the first sealing plate 41 can only move up and down.

[0056] Furthermore, such as Figure 4 , Figure 5 As shown, multiple protrusions are fixedly installed on the top of the first sealing plate 41 and the second sealing plate 42. The shapes of the protrusions correspond to the shapes of the first drain hole 101 and the second drain hole 301, respectively. When the first sealing plate 41 and the second sealing plate 42 block the first drain hole 101 and the second drain hole 301, the protrusions on the top of the first sealing plate 41 and the second sealing plate 42 pass through the first drain hole 101 and the second drain hole 301, respectively.

[0057] By fixing multiple protruding blocks above both the first sealing plate 41 and the second sealing plate 42, and by using the protruding blocks to block the first drain hole 101 and the second drain hole 301, the sealing performance of the first drain hole 101 and the second drain hole 301 can be improved, and air leakage can be avoided when the first drain hole 101 and the second drain hole 301 are blocked.

[0058] In addition, a mounting through hole 4101 is provided on the first sealing plate 41, which is used for the connecting pipe 33 to pass through.

[0059] Furthermore, such as Figure 4 As shown, the first sealing plate 41 has a limiting groove 4201 on the side of the protrusion, and the fixed plate 1 has a limiting plate 13 for locking in the limiting groove 4201. The side of the limiting plate 13 has a sliding rod 12 for driving the limiting plate 13 to lock in the limiting groove 4201.

[0060] By setting a limiting groove 4201 on the side of the protrusion of the first sealing plate 41 and using a limiting plate 13 for limiting, the first sealing plate 41 and the second sealing plate 42 can be tightly pressed against the first drain hole 101 and the second drain hole 301 in the sealing working state. The limiting plate 13 can also support the entire sealing assembly 4, lock the position of the sealing assembly 4, and prevent the sealing assembly 4 from sliding downward under the action of gravity.

[0061] Furthermore, such as Figure 8 , Figure 9 As shown, the fixed disk 1 is radially provided with multiple guide grooves 102. The guide grooves 102 are used to guide the sliding rod 12 to slide radially on the fixed disk 1. Each set of limiting plates 13 has two pieces, and the two limiting plates 13 are installed back to back. An elastic member 14 is provided between the two limiting plates 13 to drive the two limiting plates 13 to move closer to each other. The middle part of the elastic member 14 is fixedly installed inside the guide groove 102. As each sliding rod 12 moves away from the center of the fixed disk 1, it drives the two limiting plates 13 of each set of limiting plates 13 to move away from each other, and drives the limiting plates 13 to be inserted into the limiting groove 4201.

[0062] The sliding rod 12 can synchronously drive the two limiting plates 13 to move away from each other, which can lock the position of the first sealing plate 41 more quickly, and at the same time lock the protrusions above the two adjacent first sealing plates 41.

[0063] Furthermore, such as Figure 8 , Figure 9As shown, the upper end face of the limiting plate 13 is provided with a first wedge 131, and the two sides of the sliding rod 12 are provided with second wedges 131. The inclined surfaces of the first wedge 131 and the second wedge 121 are parallel to each other. The side of the connecting shaft 43 is provided with a pushing component for driving the sliding rod 12 to move away from the center of the fixed plate 1.

[0064] The inclined surfaces of the first wedge 131 and the second wedge 121 are parallel to each other. When the sliding rod 12 is pushed, the inclined surface of the second wedge 121 will press against the inclined surface of the first wedge 131, which will drive the two opposing limiting plates 13 to move away from each other.

[0065] Furthermore, such as Figure 7 , Figure 8 , Figure 9 As shown, the side of the connecting shaft 43 is provided with a plurality of mounting slots 4301. The pushing component is installed inside the mounting slot 4301. The pushing component includes a pushing block 432 and an elastic component 433. The elastic component 433 is fixedly installed inside the mounting slot 4301, and one end of the elastic component 433 is fixedly connected to the pushing block 432.

[0066] Specifically, by setting a push block 432 on the outside of the connecting shaft 43, when the push block 432 moves downward with the connecting shaft 43, the push block 432 is retracted into the mounting groove 4301. Then, when the connecting shaft 43 moves upward to the top, the elastic potential energy at the tail of the push block 432 is released. The elastic component 433 at the tail of the push block 432 will cause the push block 432 to move towards the sliding rod 12, thereby pushing the sliding rod 12 to guide the limiting plate 13 to lock the position of the first sealing plate 41.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for sealing air leaks in drainage holes of coal mine goaf areas, characterized in that, include: Fixed plate (1), fixedly installed at the opening of the drain hole; A sealing disc (3) is installed below a fixed disc (1), and a connecting cylinder (2) is fixedly installed on top of it. The top of the connecting cylinder (2) is connected to the bottom of the fixed disc (1), and a sealing space is formed between the fixed disc (1) and the sealing disc (3). The fixed disc (1) and the sealing disc (3) are respectively provided with a first drain hole (101) and a second drain hole (301). The sealing assembly (4) is used to seal the first drain hole (101) and the second drain hole (301), including a first sealing plate (41) and a second sealing plate (42) distributed at intervals. A connecting shaft (43) is coaxially arranged between the first sealing plate (41) and the second sealing plate (42). The connecting shaft (43) is slidably installed inside the connecting cylinder (2). The top of the connecting shaft (43) extends out of the first sealing plate (41). A lifting assembly (5) for driving the connecting shaft (43) to move up and down is fixedly installed above the fixed plate (1). Multiple protrusions are fixedly installed on the top of the first sealing plate (41) and the second sealing plate (42). The shapes of the protrusions correspond to the shapes of the first drain hole (101) and the second drain hole (301). When the first sealing plate (41) and the second sealing plate (42) block the first drain hole (101) and the second drain hole (301), the protrusions on the top of the first sealing plate (41) and the second sealing plate (42) pass through the first drain hole (101) and the second drain hole (301) respectively. The first sealing plate (41) has a limiting groove (4201) on the side of the protrusion block. The fixed plate (1) is provided with a limiting plate (13) for locking in the limiting groove (4201). The side of the limiting plate (13) is provided with a sliding rod (12) for driving the limiting plate (13) to be locked in the limiting groove (4201). The fixed disk (1) is provided with a plurality of guide grooves (102) in the radial direction. The guide grooves (102) are used to guide the sliding rod (12) to slide in the radial direction of the fixed disk (1). Each set of the limiting plates (13) has two pieces. The two limiting plates (13) are installed back to back. An elastic element (14) is provided between the two limiting plates (13) to drive the two limiting plates (13) to move closer to each other. The middle part of the elastic element (14) is fixedly installed inside the guide groove (102). When each sliding rod (12) moves away from the center of the fixed disk (1), it drives the two limiting plates (13) of each set of limiting plates (13) to move away from each other and drives the limiting plates (13) to be inserted into the limiting groove (4201). The upper end face of the limiting plate (13) is provided with a first wedge (131), and the two sides of the sliding rod (12) are provided with second wedges (121). The inclined surfaces of the first wedge (131) and the second wedge (121) are parallel to each other. The side of the connecting shaft (43) is provided with a pushing component for driving the sliding rod (12) to move away from the center of the fixed plate (1).

2. The air-blocking device for drainage holes in coal mine goafs according to claim 1, characterized in that, An extension plate (11) is fixedly installed on the outside of the fixed plate (1), and a cylindrical structure that is inserted into the drain hole is formed below the fixed plate (1).

3. The air leakage plugging device for drainage holes in coal mine goaf areas according to claim 1, characterized in that, An mounting bracket (31) is provided on the outer side of the sealing disc (3), and an annular groove is formed on the outer peripheral surface of the mounting bracket (31), and a sealing airbag (32) is provided inside the annular groove.

4. A device for sealing air leaks in drainage holes in coal mine goafs according to claim 3, characterized in that, A sliding piston (431) is fixedly installed on the outside of the connecting shaft (43). The outer circumferential surface of the sliding piston (431) is slidably connected to the inner wall of the connecting cylinder (2). A compression space is formed between the connecting shaft (43) and the connecting cylinder (2). A connecting pipe (33) is provided at the bottom of the compression space. The connecting pipe (33) is used to fill the sealed airbag (32) with gas.

5. A device for sealing air leaks in drainage holes in coal mine goafs according to claim 1, characterized in that, The connecting cylinder (2) is provided with guide openings (201) around its perimeter, and the connecting shaft (43) is fixedly installed with connecting arms extending out of the guide openings (201) around its perimeter. The first sealing plate (41) is connected to the connecting shaft (43) through the connecting arms.

6. A device for sealing air leaks in drainage holes in coal mine goafs according to claim 1, characterized in that, The side of the connecting shaft (43) is provided with a plurality of mounting slots (4301). The pushing component is installed inside the mounting slot (4301). The pushing component includes a pushing block (432) and an elastic component (433). The elastic component (433) is fixedly installed inside the mounting slot (4301). One end of the elastic component (433) is fixedly connected to the pushing block (432).

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