Anti-blocking device for mine collecting funnel

Abstract

The utility model relates to the technical field of ore collecting funnels, and discloses an anti-blocking device for a mine ore collecting funnel, which comprises a funnel body, an anti-blocking device and a control device, the funnel body comprises a conveying channel arranged along the horizontal direction and a feed port communicated with the upper end of the conveying channel, and a discharge port is arranged on one side of the conveying channel; the push plate is connected into the conveying channel in a sliding mode and used for pushing mineral aggregates entering through the feeding port to the discharging port, and a shielding plate is arranged at the upper end of the push plate and selectively shields the feeding port; and the power assembly is used for driving the push plate to do reciprocating motion in the conveying channel. According to the utility model, mineral aggregates can be effectively prevented from being accumulated on one side, far away from the discharge hole, of the push plate, so that the phenomenon of blockage of the push plate caused by the mineral aggregates can be effectively avoided. And ores can be prevented from being accumulated in the funnel body through the push plate, so that the risk of blockage of the funnel body is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ore collecting funnels, in particular to an anti-blocking device for a mine ore collecting funnel. Background Art

[0002] Belt conveyors are essential equipment for transporting ore, serving as the "blood vessels" that connect various process stages and supply raw materials. Their application is not limited to coal production and processing, but also applies to the production and processing of various other minerals. Belt conveyors often use hoppers when transferring raw materials. The process works as follows: the belt conveyor at the front feeds the raw materials into the hopper, which then flows into the belt conveyor behind for further transport. However, for various reasons, the hoppers carrying raw materials can easily become clogged, disrupting the belt conveyor's ability to transport raw materials properly. This significantly increases the difficulty of maintaining production and the workload of employees.

[0003] Patent announcement number CN220843834U discloses a device for preventing blocking of a mine ore collecting funnel. In this device, a crushing assembly is used to crush the ore to prevent large particles of ore from being blocked during the falling process. A driving assembly is used to disperse the crushed ore to avoid the accumulation of blocks after the crushed ore. The rotation of the spiral tube drives the ore that falls inside the connecting shell to be evenly transported, and the ore is discharged through the discharge port.

[0004] However, the above device has the following defects: the crushing component continuously crushes the ore, and the two push plates will push the crushed ore into blocks when moving, so that the crushed ore will not accumulate into blocks. However, the crushed ore continues to fall, and there is a certain probability that it will fall to the side where the two push plates are away from each other, causing the push plates to get stuck during movement, or even unable to reciprocate, which will further cause the ore to accumulate in the funnel and fail to reduce the blockage.

[0005] In view of this, how to solve the jamming phenomenon caused by ore when the push plate reciprocates has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0006] The utility model aims to provide a device for preventing the blocking of a mine collecting hopper, so as to overcome the above-mentioned disadvantages.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a device for preventing the blocking of a mine collecting hopper, comprising:

[0008] The funnel body includes a conveying channel arranged in a horizontal direction and a feed port connected to the upper end of the conveying channel, and a discharge port is provided on one side of the conveying channel;

[0009] A push plate slidably connected to the conveying channel, the push plate is used to push the mineral material entering through the feed port to the discharge port, and a shielding plate is provided on the upper end of the push plate, the shielding plate selectively shielding the feed port; and

[0010] A power assembly is used to drive the push plate to perform reciprocating motion in the conveying channel.

[0011] Furthermore, a scraper assembly is installed on the top plate on the other side of the conveying channel, and the scraper assembly is slidably connected to the upper surface of the shielding plate.

[0012] Furthermore, the scraper assembly includes:

[0013] Rotating a rotating rod connected to the top plate on the other side of the conveying channel;

[0014] an inclined scraper, the scraper being inclined from top to bottom toward the feed port, one end of the scraper being fixedly connected to the side wall of the rotating rod, and the other end of the scraper being slidably connected to the upper surface of the shielding plate; and

[0015] An elastic member is used to drive the rotating rod to rotate and achieve the other end of the scraper to fit with the upper surface of the shielding plate.

[0016] Furthermore, the elastic member includes:

[0017] A driving rod is installed outside the conveying channel, and an end of the rotating rod passes through the conveying channel and is fixedly connected to one end of the driving rod;

[0018] A positioning block fixedly mounted on the outer side wall of the conveying channel; and

[0019] A tension spring, one end of the tension spring is fixedly connected to the positioning block, and the other end of the tension spring is fixedly connected to the other end of the driving rod. The tension spring is used to drive the other end of the driving rod to rotate, so as to realize the sliding connection between the other end of the scraper and the upper surface of the baffle.

[0020] Furthermore, the shielding plate includes a sliding sleeve and a sliding plate with one end slidingly connected to the sliding sleeve, the side wall of the sliding sleeve is provided with a sliding groove, the inner side wall of the conveying channel is fixedly connected with a slider, the slider is slidingly connected to the sliding groove, and the other end of the sliding plate is fixedly connected to the upper end of the push plate.

[0021] Furthermore, a plurality of sliding wheel frames are installed on the side of the push plate away from the discharge port, and sliding wheels are rotatably installed on the sliding wheel frames. The sliding wheels are frictionally connected to the inner bottom plate of the conveying channel, and connecting plates are fixedly connected between the plurality of sliding wheel frames, and a supporting inclined plate is fixedly connected between the connecting plate and the push plate.

[0022] Further, the power assembly comprises:

[0023] A first connecting lug fixedly connected to the side wall of the push plate away from the discharge port;

[0024] A drive motor fixedly connected to the outer side wall of the conveying channel, the drive motor being located on the side of the push plate away from the discharge port, and one end of the output shaft of the drive motor being fixedly connected with the first connecting rod; and

[0025] A second connecting rod, one end of the second connecting rod being hingedly connected with the other end of the first connecting rod, and the other end of the second connecting rod being hingedly connected with the first connecting lug.

[0026] Further, the down-pressing assembly further comprises:

[0027] Further, the down-pressing assembly further comprises:

[0028] A supporting frame fixedly connected above the conveying channel;

[0029] A third connecting rod, one end of the third connecting rod being hingedly connected with the supporting frame, and the other end of the third connecting rod being hingedly connected with the upper end of the down-pressing rod;

[0030] A first curved rod located below the third connecting rod, the middle part of the first curved rod being rotatably connected with the supporting frame, and one end of the first curved rod being rotatably connected with the middle part of the down-pressing rod;

[0031] A second connecting lug fixedly connected to the side wall of the push plate away from the discharge port; and

[0032] A second curved rod, one end of the second curved rod being hingedly connected with the second connecting lug, and the other end of the second curved rod penetrating through above the conveying channel and being hingedly connected with the other end of the first curved rod.

[0033] Further, the lower end of the down-pressing rod is fixedly connected with a down-pressing block.

[0034] Compared with the prior art, the utility model has at least the following advantages:

[0035] The ore enters the conveying channel of the funnel body from the feed port, and the power assembly drives the push plate to make reciprocating motion along the conveying channel, which can push the ore toward the discharge port and discharge it from the discharge port, so that the ore is slowly introduced into the belt conveyor behind. When the push plate slides under the feed port, the baffle can block the feed port, and the ore will stop entering the discharge port. Furthermore, the push plate slides away from the discharge port, and the baffle gradually opens the feed port, at which point the ore enters the conveying channel again through the feed port. Through the above method, it is possible to effectively prevent the ore from accumulating on the side of the push plate away from the discharge port, thereby effectively preventing the push plate from getting stuck due to the ore. The push plate can prevent the ore from accumulating in the funnel body, thereby reducing the risk of clogging of the funnel body. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a schematic diagram of the overall structure of the utility model's anti-blocking device for a mine collecting hopper;

[0038] Figure 2 This is a cross-sectional view of the utility model of the anti-blocking device for the mine collecting funnel;

[0039] Figure 3 This is an exploded view of the utility model's anti-blocking device for a mine collecting hopper;

[0040] Figure 4 For this utility model Figure 1 A partial enlarged view of area A in the middle;

[0041] Figure 5 This is a schematic diagram of the assembly of the rotating rod, scraper, drive rod, positioning block and tension spring of the utility model;

[0042] Figure 6 It is a cross-sectional view of the sliding sleeve and the sliding plate of the utility model.

[0043] Figure markings: 1. Conveying channel; 2. Feed port; 3. Discharge port; 4. Push plate; 5. Rotating rod; 6. Scraper; 7. Driving rod; 8. Positioning block; 9. Tension spring; 10. Sliding sleeve; 11. Sliding plate; 12. Slide groove; 13. Sliding block; 14. Sliding wheel; 15. Connecting plate; 16. Support inclined plate; 17. First connecting ear; 18. Driving motor; 19. First connecting rod; 20. Second connecting rod; 21. Pressing rod; 22. Pressing block; 23. Support frame; 24. Third connecting rod; 25. First curved rod; 26. Second connecting ear; 27. Second curved rod. DETAILED DESCRIPTION

[0044] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0046] Reference Figure 1-3 The present invention provides a device for preventing clogging of a mine ore collecting hopper, comprising a hopper body, a push plate 4, a shielding plate, and a power assembly. The hopper body comprises a conveying channel 1, a feed port 2, and a discharge port 3. The conveying channel 1 is arranged horizontally, with the feed port 2 connected to the upper end of the conveying channel 1, and the discharge port 3 provided on one side of the conveying channel 1. The push plate 4 is slidably connected within the conveying channel 1 and is used to push the ore entering through the feed port 2 to the discharge port 3. A shielding plate is installed at the upper end of the push plate 4, which can selectively shield the feed port 2. The power assembly is used to drive the push plate 4 to reciprocate within the conveying channel 1.

[0047] The ore enters the conveying channel 1 of the funnel body from the feed port 2, and the power component drives the push plate 4 to make reciprocating motion along the conveying channel 1, which can push the ore toward the discharge port 3 and discharge it from the discharge port 3, so that the ore is slowly introduced into the belt conveyor behind. When the push plate 4 slides under the feed port 2, the baffle can block the feed port 2, and the ore will stop entering the discharge port 3. Further, the push plate 4 slides in the direction away from the discharge port 3, and the baffle gradually opens the feed port 2. At this time, the ore enters the conveying channel 1 through the feed port 2 again. In this way, the ore can be effectively prevented from accumulating on the side of the push plate 4 away from the discharge port 3, and the jamming of the push plate 4 caused by the ore can be effectively avoided. The push plate 4 can prevent the ore from accumulating in the funnel body, thereby reducing the risk of clogging of the funnel body.

[0048] Preferably, in order to facilitate the cleaning of the mineral materials accumulated on the surface of the baffle, a scraper assembly is installed on the top plate on the other side of the conveying channel 1. The scraper assembly is installed near the feed port 2. The scraper assembly is slidably connected to the upper surface of the baffle to remove the remaining mineral materials on the surface of the baffle by scraping.

[0049] Reference Figure 3-5 The scraper assembly comprises a rotating rod 5, a scraper blade 6, and an elastic member. The rotating rod 5 is rotatably connected to the top plate on the other side of the conveying channel 1. The scraper blade 6 is tilted, tilting from top to bottom toward the feed inlet 2. One end of the scraper blade 6 is fixedly connected to the side wall of the rotating rod 5 via a through-going bolt, and the other end of the scraper blade 6 is slidably connected to the upper surface of the shielding plate. The elastic member is used to drive the rotating rod 5 and ensure that the other end of the scraper blade 6 is in contact with the upper surface of the shielding plate.

[0050] Specifically, the elastic member includes a drive rod 7, a positioning block 8, and a tension spring 9. The drive rod 7, positioning block 8, and tension spring 9 are provided in two groups, one mounted on each side of the conveying channel 1. The end of the rotating rod 5 passes through the conveying channel 1 and is fixedly connected to one end of the drive rod 7; the positioning block 8 is fixedly mounted on the outer wall of the conveying channel 1; one end of the tension spring 9 is fixedly connected to the positioning block 8, and the other end of the tension spring 9 is fixedly connected to the other end of the drive rod 7. The tension spring 9 is used to drive the other end of the drive rod 7 to rotate, thereby achieving a sliding connection between the other end of the scraper 6 and the upper surface of the shielding plate.

[0051] In a specific embodiment of the present invention, Figure 4-5 As shown, the tension spring 9 is used to drive the other end of the driving rod 7 to rotate clockwise along one end of the driving rod 7, thereby driving the rotating rod 5 and the scraper 6 to rotate clockwise so that the other end of the driving rod 7 is attached to the upper surface of the shielding plate.

[0052] Reference Figure 6 The baffle includes a sliding sleeve 10 and a sliding plate 11. The sliding sleeve 10 is provided with an opening on the side close to the feed port 2. One end of the sliding plate 11 is slidably connected to the sliding sleeve 10. A slide groove 12 is provided on the side wall of the sliding sleeve 10. A slider 13 is fixedly connected to the inner wall of the conveying channel 1. The slider 13 is slidably connected to the slide groove 12. The other end of the sliding plate 11 is fixedly connected to the upper end of the push plate 4.

[0053] In order to achieve sliding limitation of the sliding plate 11 and the sliding sleeve 10, a sliding protrusion is provided on the lower surface of the sliding plate 11 away from the feed port 2, and a sliding groove is provided on the inner bottom surface of the sliding sleeve 10, and the sliding protrusion is slidably connected to the sliding groove.

[0054] Reference Figure 3In order to facilitate the sliding of the push plate 4 in the conveying channel 1, multiple sets of sliding wheel frames are installed on the side of the push plate 4 away from the discharge port 3. The sliding wheel 14 is rotatably installed on the sliding wheel frame. The sliding wheel 14 is frictionally connected to the inner bottom plate of the conveying channel 1. A connecting plate 15 is fixedly connected between the multiple sets of sliding wheel frames, and a supporting inclined plate 16 is fixedly connected between the connecting plate 15 and the push plate 4.

[0055] The lower end of the push plate 4 is mounted with a sliding wheel 14, which is frictionally connected to the inner bottom plate of the conveying channel 1. The upper end of the push plate 4 is mounted with a sliding sleeve 10, which is slidably connected to a slider 13, effectively preventing the push plate 4 from tipping over in the conveying channel 1. Furthermore, a support ramp 16 is provided to improve the structural stability of the push plate 4.

[0056] Preferably, the power assembly includes a drive motor 18, a first connecting rod 19, and a second connecting rod 20. All three are located on the side of the push plate 4 away from the discharge port 3. The drive motor 18 is fixedly connected to the outer wall of the conveying channel 1, and the output shaft of the drive motor 18 is fixedly connected to one end of the first connecting rod 19. One end of the second connecting rod 20 is hinged to the other end of the first connecting rod 19, and the other end of the second connecting rod 20 is hinged to the first connecting lug 17, which is fixedly connected to the side wall of the push plate 4 away from the discharge port 3.

[0057] The drive motor 18 is activated, causing the other end of the first connecting rod 19 to rotate around one end of the first connecting rod 19, thereby driving the first connecting ear 17 and the push plate 4 to move along the conveying channel 1 toward the discharge port 3. The sliding plate 11 and the sliding sleeve 10 gradually block the feed port 2, and the ore is pushed to the discharge port 3 under the action of the push plate 4. The other end of the first connecting rod 19 continues to rotate around one end of the first connecting rod 19, causing the sliding plate 11 and the sliding sleeve 10 to gradually release the blockage of the feed port 2. The ore on the sliding sleeve 10 is scraped by the scraper 6 to the side of the push plate 4 near the discharge port 3. The sliding plate 11 and the sliding sleeve 10 slide into the conveying channel 1, and the ore added at this time enters the conveying channel 1 through the feed port 2. In this way, the push plate 4 performs a reciprocating motion once, and the ore in the conveying channel 1 can be pushed out through the discharge port 3 by the push plate 4, thereby reducing the possibility of the ore clogging in the funnel body.

[0058] To prevent material from accumulating at the feed port 2, the present invention further includes a push-down assembly. This assembly includes a push-down rod 21. When the push plate 4 slides to the other side of the conveying channel 1, the push-down rod 21 can be selectively inserted into the conveying channel 1 from the upper end of the feed port 2. A push-down block 22 is fixedly connected to the lower end of the push-down rod 21. The push-down rod 21 can push material blocked at the feed port 2 downward into the conveying channel 1.

[0059] Preferably, the lower pressing assembly further comprises a support frame 23, a third connecting rod 24, a first curved rod 25 and a second curved rod 27. The support frame 23 is fixedly connected above the conveying channel 1; one end of the third connecting rod 24 is hingedly connected with the support frame 23, and the other end of the third connecting rod 24 is hingedly connected with the upper end of the lower pressing rod 21; the first curved rod 25 is located below the third connecting rod 24, the middle part of the first curved rod 25 is rotatably connected with the support frame 23, and one end of the first curved rod 25 is rotatably connected with the middle part of the lower pressing rod 21; the second connecting lug 26 is fixedly connected to the side wall of the push plate 4 away from the discharge port 3; one end of the second curved rod 27 is hingedly connected with the second connecting lug 26, and the other end of the second curved rod 27 penetrates through above the conveying channel 1 and is hingedly connected with the other end of the first curved rod 25.

[0060] The working principle of the utility model is as follows:

[0061] Start the driving motor 18, drive the push plate 4 to move towards the direction close to the discharge port 3, and the lower pressing rod 21 and the lower pressing block 22 are drawn out from the conveying channel 1 and the feeding port 2 under the action of the third connecting rod 24 and the first curved rod 25, at this time, the feeding work can be carried out from the feeding port 1, and the sliding plate 11 and the sliding sleeve 10 gradually block the feeding port 2, the mineral material is pushed to the discharge port 3 under the action of the push plate 4, and the newly added mineral material falls onto the sliding plate 11 and the sliding sleeve 10. With the continuous rotation of the driving motor 18, the push plate 4 will be driven to move away from the discharge port 3, and the sliding plate 11 and the sliding sleeve 10 slide into the conveying channel 1, at this time, the feeding port 2 stops adding mineral material, and the lower pressing rod 21 and the lower pressing block 22 are inserted into the conveying channel 1 from the feeding port 2 under the action of the third connecting rod 24 and the first curved rod 25, so as to avoid the accumulation of mineral material at the feeding port 2. The above process is repeated, so that the mineral material can enter the conveying channel 1 from the feeding port 2 and be output from the discharge port 3 under the action of the push plate 4.

[0062] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0063] The above-described embodiments are only preferred modes of the utility model, and do not limit the scope of the utility model, and various deformations and improvements of the technical scheme of the utility model made by those skilled in the art without departing from the design spirit of the utility model should fall within the protection scope determined by the claims of the utility model.

Claims

1. A device for preventing the blocking of a mine collecting hopper, characterized in that: include: The funnel body comprises a conveying channel (1) arranged in a horizontal direction and a feed port (2) connected to the upper end of the conveying channel (1); a discharge port (3) is provided on one side of the conveying channel (1); A push plate (4) is slidably connected to the conveying channel (1), and the push plate (4) is used to push the mineral material entering through the feed port (2) to the discharge port (3). A shielding plate is provided at the upper end of the push plate (4), and the shielding plate selectively shields the feed port (2); and A power component for driving the push plate (4) to perform reciprocating motion in the conveying channel (1).

2. The anti-blocking device for a mine collecting hopper according to claim 1, characterized in that: A scraper assembly is installed on the top plate on the other side of the conveying channel (1), and the scraper assembly is slidably connected to the upper surface of the shielding plate.

3. The anti-blocking device for a mine collecting hopper according to claim 2, characterized in that: The scraper assembly comprises: Rotating a rotating rod (5) connected to the top plate on the other side of the conveying channel (1); an inclined scraper (6), the scraper (6) being inclined from top to bottom toward the feed port (2), one end of which is fixedly connected to the side wall of the rotating rod (5), and the other end of which is slidably connected to the upper surface of the shielding plate; and An elastic member used for driving the rotating rod (5) to rotate and achieving the other end of the scraper (6) to fit with the upper surface of the shielding plate.

4. The anti-blocking device for a mine collecting hopper according to claim 3, characterized in that: The elastic member comprises: A driving rod (7) is installed outside the conveying channel (1), and an end of the rotating rod (5) passes through the conveying channel (1) and is fixedly connected to one end of the driving rod (7); a positioning block (8) fixedly mounted on the outer side wall of the conveying channel (1); and A tension spring (9), one end of the tension spring (9) is fixedly connected to the positioning block (8), and the other end of the tension spring (9) is fixedly connected to the other end of the driving rod (7), and the tension spring (9) is used to drive the other end of the driving rod (7) to rotate, so as to achieve a sliding connection between the other end of the scraper (6) and the upper surface of the shielding plate.

5. The anti-blocking device for a mine collecting hopper according to claim 4, characterized in that: The shielding plate includes a sliding sleeve (10) and a sliding plate (11) with one end slidingly connected to the sliding sleeve (10), a sliding groove (12) is provided on the side wall of the sliding sleeve (10), a slider (13) is fixedly connected to the inner side wall of the conveying channel (1), the slider (13) is slidingly connected to the sliding groove (12), and the other end of the sliding plate (11) is fixedly connected to the upper end of the push plate (4).

6. The anti-blocking device for a mine collecting hopper according to claim 5, characterized in that: A plurality of sliding wheel frames are installed on the side of the push plate (4) away from the discharge port (3), and a sliding wheel (14) is rotatably installed on the sliding wheel frame. The sliding wheel (14) is frictionally connected to the inner bottom plate of the conveying channel (1), and a connecting plate (15) is fixedly connected between the plurality of sliding wheel frames, and a supporting inclined plate (16) is fixedly connected between the connecting plate (15) and the push plate (4).

7. The anti-blocking device for a mine collecting hopper according to any one of claims 1 to 6, characterized in that: The power assembly includes: A first connecting ear (17) fixedly connected to a side wall of the push plate (4) away from the discharge port (3); a drive motor (18) fixedly connected to the outer side wall of the conveying channel (1), the drive motor (18) being located on a side of the push plate (4) away from the discharge port (3), the output shaft of the drive motor (18) being fixedly connected to one end of a first connecting rod (19); and A second connecting rod (20), one end of the second connecting rod (20) is hinged to the other end of the first connecting rod (19), and the other end of the second connecting rod (20) is hinged to the first connecting ear (17).

8. The anti-blocking device for a mine collecting hopper according to claim 7, characterized in that: It also includes a pressing assembly, which includes a pressing rod (21). When the push plate (4) slides to the other side of the conveying channel (1), the pressing rod (21) is selectively inserted into the conveying channel (1) from the upper end of the feed port (2).

9. The anti-blocking device for a mine collecting hopper according to claim 8, characterized in that: The pressing assembly further comprises: A support frame (23) fixedly connected to the upper portion of the conveying channel (1); a third connecting rod (24) having one end hinged to the support frame (23) and the other end hinged to the upper end of the lower pressure rod (21); a first curved rod (25) located below the third connecting rod (24), wherein the middle portion of the first curved rod (25) is rotatably connected to the support frame (23), and one end of the first curved rod (25) is rotatably connected to the middle portion of the lower pressure rod (21); a second connecting ear (26) fixedly connected to a side wall of the push plate (4) away from the discharge port (3); and A second curved rod (27) is hinged at one end to the second connecting ear (26), and the other end of the second curved rod (27) passes through the top of the conveying channel (1) and is hinged to the other end of the first curved rod (25).

10. The anti-blocking device for a mine collecting hopper according to claim 9, characterized in that: The lower end of the lower pressing rod (21) is fixedly connected with a lower pressing block (22).

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