A concrete hopper discharge port leakage prevention device for a trolley

Abstract

The utility model relates to concrete discharging technology field, and disclose a kind of concrete hopper discharge port leak-proof device for trolley, including hopper body, the lower end of hopper body is located at discharge port and is connected with duckbill gate, the lower end of the outer wall of hopper body is fixedly connected with fixed sleeve, the top of duckbill gate is fixedly connected with the mounting seat matched with fixed sleeve, limiting assembly for being fixed in the outer wall of fixed sleeve is provided on mounting seat, the both sides of mounting seat bottom are fixedly connected with the link of symmetry;This kind of concrete hopper discharge port leak-proof device for trolley, the closure mode of duckbill gate is from the end of outlet to be flattened and sealed, its contact line is long and closed tightly, can more effectively prevent viscous concrete slurry under pressure seepage.Secondly, the linear and accurate adjustment of discharge port are realized, the clamping force can be steplessly changed by external mechanical assembly control, so that operator can fine control the flow rate and flow of concrete, to improve the quality of pouring.

Description

Technical Field

[0001] This utility model relates to the field of concrete discharge technology, specifically to a leakage prevention device for the discharge port of a concrete hopper for a trolley. Background Technology

[0002] In the construction of concrete linings for tunnels, culverts, and other engineering projects, trolleys are typically used for cast-in-place concrete work. Concrete is poured into the hopper at the top of the trolley via a conveying system, and then distributed to the various pouring windows through the discharge outlet at the bottom of the hopper. However, traditional hopper discharge ports are usually controlled by a simple gate. Aggregates can easily get stuck between the gate and the discharge port or gaps can be created due to wear, causing concrete slurry to leak continuously when closed. This not only wastes materials and pollutes the work site, but also affects the precise control of the pouring volume. To address the aforementioned issues, this application proposes a leakage prevention device for the discharge port of a concrete hopper used in a trolley. Utility Model Content

[0003] This utility model aims to provide a leakage prevention device for the discharge port of a concrete hopper for a trolley. It is mainly used to solve the problem that the discharge port of the existing hopper is usually controlled by a simple gate, which is prone to the accumulation of aggregate or gaps due to wear between the gate and the discharge port. This causes the concrete slurry to leak continuously when the port is closed, resulting in material waste, pollution of the work site, and affecting the accurate control of the pouring volume.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A leakage prevention device for the discharge port of a concrete hopper for a trolley includes a hopper body. A duckbill gate is connected to the lower end of the hopper body at the discharge port. A fixing sleeve is fixedly connected to the lower end of the outer wall of the hopper body. A mounting seat matching the fixing sleeve is fixedly connected to the top of the duckbill gate. A limiting component for fixing it to the outer wall of the fixing sleeve is provided on the mounting seat. Symmetrical connecting rods are fixedly connected to both sides of the bottom of the mounting seat. An adjusting box is fixedly connected to the lower end of the two connecting rods on the same side. An adjusting component for adjusting the discharge volume is provided between the two adjusting boxes.

[0005] The working principle and beneficial effects of this utility model: 1. Working Principle: The duckbill gate at the outlet of the hopper body maintains a certain open state under its own elasticity or the weight of the internal material when not constrained by external forces. When pressure is applied from both sides, its elongated outlet is flattened, thus closing or reducing the opening. The device connects the duckbill gate to a fixed sleeve at the end of the hopper body's outlet via a top mounting base, and achieves quick connection through a "limiting component." More importantly, adjusting boxes are rigidly connected to both sides of the duckbill gate via connecting rods. The "adjusting component" between the two adjusting boxes acts as a whole, synchronously clamping or loosening the lower part of the duckbill gate, thereby achieving continuous and precise control of the outlet opening.

[0006] 2. Beneficial Effects: The duckbill gate closes by flattening and sealing the outlet end. Its long contact line and tight closure more effectively prevent leakage of viscous concrete slurry under pressure compared to traditional flat gates. Secondly, it achieves linear and precise adjustment of the discharge port. By controlling the clamping force through external mechanical components, the opening size can be steplessly changed, allowing operators to precisely control the flow rate and volume of concrete, thereby improving pouring quality.

[0007] Preferably, the limiting component includes a sliding cavity formed in the inner wall of the mounting base, and the sliding cavities are symmetrically arranged on the inner wall of the mounting base. A limiting block is slidably connected inside the sliding cavity. One side of the limiting block extends out of the sliding cavity, and a pull rod is fixedly connected to the other side. The other end of the pull rod extends out of the mounting base and is fixedly connected to a pull block. A spring is sleeved on the outer wall of the pull rod. One end of the spring is fixedly connected to the limiting block, and the other end is fixedly connected to the inner wall of the sliding cavity. A limiting groove matching the limiting block is formed on the outer wall of the fixed sleeve. In its natural state, the spring is in a compressed state, and its restoring force pushes the limiting block outward, causing a portion of it to protrude from the inner wall surface of the mounting base. During installation, the pull block is pulled, which in turn drives the limiting block into the sliding cavity via the pull rod. Then, the mounting base is fitted onto the fixed sleeve. When the mounting base is fully fitted into place, i.e., when the limiting block slides to align with the preset limiting groove on the outer wall of the fixed sleeve, the preload of the spring will instantly pop the limiting block out and lock it into the limiting groove, thereby forming a mechanical interlock and firmly locking the mounting base onto the fixed sleeve. During disassembly, simply pull the pull block outwards, and the limit block will be actively pulled back into the sliding cavity via the pull rod to release the lock and remove the entire device. The continuous clamping force provided by the spring ensures the lock's firmness, effectively resisting the vibration generated during concrete pouring, preventing the duckbill gate from accidentally loosening, ensuring operational safety, and making the disassembly and assembly of the duckbill gate more convenient, thus facilitating the removal and cleaning of the duckbill gate by the staff.

[0008] Preferably, a positioning block is fixedly connected to the outer wall of the fixed sleeve, and an anti-misalignment groove matching the positioning block is formed on the inner wall of the mounting base. There is only one unique relative angle between the mounting base and the fixed sleeve, allowing the positioning block to smoothly embed into the anti-misalignment groove. This ensures that the elongated outlet direction of the duckbill gate is accurately positioned every time, preventing incorrect installation due to human error that could affect the discharge direction and pouring effect, or even damage the equipment. Secondly, it greatly improves assembly efficiency. The clear positioning features eliminate the need for visual judgment or repeated adjustments by the operator, enabling "blind operation" for rapid, one-time alignment and installation, further shortening installation time and ensuring consistent quality in each installation.

[0009] Preferably, the corners at the top of the side of the limiting block extending out of the sliding cavity are all sloped. When the mounting sleeve is installed towards the fixing sleeve, the outer wall of the fixing sleeve will press the slope of the limiting block, causing it to slide automatically into the sliding cavity. This eliminates the need for manual pulling of the limiting block to enter the sliding cavity, making the installation of the duckbill gate more convenient.

[0010] Preferably, all corners of the pull block are rounded, and the outer wall of the pull block is covered with an anti-slip sleeve. By making all corners of the pull block rounded, the safety of operation is greatly improved, sharp edges are eliminated, and workers' hands are prevented from being scratched when operating in a hurried or dimly lit construction environment. The anti-slip sleeve on the outer wall of the pull block increases the friction between the hand and the pull block, ensuring that even if the worker's hands are wet, covered with mud, or wearing gloves, they can still firmly grip the pull block and apply sufficient pulling force to unlock the device, effectively preventing slippage. This makes the disassembly operation easier and more reliable, improving the overall user experience.

[0011] Preferably, the regulating assembly includes clamping rods slidably connected between two regulating boxes, with the clamping rods symmetrically arranged between the two regulating boxes. Both ends of the clamping rods extend into the regulating boxes and are fixedly connected to sliding blocks. The sliding blocks are slidably connected to the inner wall of the regulating box. The regulating box has elongated grooves matching the clamping rods. Inside the regulating box is a driving assembly for synchronously moving the two sliding blocks. When the driving assembly operates, it synchronously drives the sliding blocks in both regulating boxes to move towards or away from each other. During the towards-facing movement, the sliding blocks, through the clamping rods, uniformly squeeze the flexible pipe wall of the duckbill gate from both sides, causing deformation, narrowing the outlet gap, and reducing the discharge volume. During the away-facing movement, the clamping force is released, and the duckbill gate opens under its own elastic restoring force or the gravity of the internal concrete, increasing the discharge volume. The elongated grooves provide the necessary travel space for the reciprocating movement of the clamping rods, thus achieving precise and linear control of the concrete flow rate. This allows the outlet gap size to change steplessly and linearly, enabling the operator to precisely control the concrete flow rate like adjusting a faucet, which is crucial for ensuring pouring quality.

[0012] Preferably, the drive assembly includes a bidirectional lead screw rotatably connected to one end of the inner wall of the adjustment box, the bidirectional lead screw passing through a sliding block and threadedly connected to the sliding block, and a first bevel gear fixedly connected to the other end of each bidirectional lead screw. A second bevel gear is meshed with one side of the first bevel gear, and both the first and second bevel gears are rotatably connected to the inner wall of the adjustment box. A rotating rod is fixedly connected between the two second bevel gears, and a rotating shaft is fixedly connected to one side of one of the first bevel gears. The other end of the rotating shaft extends out of the adjustment box and is fixedly connected to a handwheel. Rotating the handwheel drives the rotating shaft and the first bevel gear fixed thereto to rotate. The first bevel gear drives the second bevel gear meshing perpendicularly with it, thereby turning the rotational motion 90 degrees and transmitting it to the rotating rod passing through the two adjustment boxes. The rotation of the rotating rod will drive the second bevel gear and the first bevel gear (i.e., another bidirectional lead screw) in the other adjustment box to rotate synchronously. Through precise gear matching, the rotation direction and speed of the two bidirectional lead screws are completely consistent, thereby ensuring the high synchronization of the movement of the sliding blocks on both sides. The operator only needs to turn the handwheel in a single position to complete the adjustment of the opening of the entire discharge port. The operation is very convenient and intuitive, and its advantages are obvious, especially in construction environments with limited space. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the entire utility model; Figure 2 This is a schematic diagram of the overall structure of the hopper body and the duckbill gate after separation. Figure 3 This is a cross-sectional structural diagram of the entire utility model; Figure 4 This is a partially enlarged cross-sectional structural diagram of the present invention; Figure 5 This utility model Figure 3 A magnified structural diagram of point A in the middle.

[0014] In the diagram: 1. Hopper body; 2. Duckbill gate; 3. Fixing sleeve; 4. Mounting base; 5. Connecting rod; 6. Adjusting box; 7. Clamping rod; 8. Sliding block; 9. Long groove; 10. Sliding cavity; 11. Limiting block; 12. Pull rod; 13. Pull block; 14. Spring; 15. Limiting groove; 16. Positioning block; 17. Anti-fooling groove; 18. Double-acting screw; 19. First bevel gear; 20. Rotating shaft; 21. Handwheel; 22. Second bevel gear; 23. Rotating rod. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-5 A leakage prevention device for the discharge port of a concrete hopper for a trolley includes a hopper body 1. A duckbill gate 2 is connected to the lower end of the hopper body 1 at the discharge port. When not constrained by external forces, the duckbill gate 2 will remain in a certain open state under its own elasticity or the gravity of the internal material. When pressure is applied from both sides, its flat and elongated outlet will be flattened, thereby closing or reducing the opening. A fixed sleeve 3 is fixedly connected to the lower end of the outer wall of the hopper body 1. A mounting base 4 that matches the fixed sleeve 3 is fixedly connected to the top of the duckbill gate 2. A limiting component is provided on the mounting base 4 for fixing it to the outer wall of the fixed sleeve 3. The duckbill gate 2 is connected to the fixed sleeve 3 fixed to the end of the discharge port of the hopper body 1 through the mounting base 4 at the top, and a quick connection is achieved through the "limiting component". This makes it convenient for workers to disassemble the duckbill gate 2 for cleaning. Symmetrical connecting rods 5 are fixedly connected to both sides of the bottom of the mounting base 4. An adjustment box 6 is fixedly connected to the lower end of the two connecting rods 5 on the same side. An adjustment component for adjusting the discharge volume is set between the two adjustment boxes 6. The lower part of the duckbill gate 2 can be clamped or released synchronously through the adjustment component, thereby realizing continuous and precise control of the discharge port opening.

[0017] More specifically, the limiting component includes a sliding cavity 10 opened in the inner wall of the mounting base 4, and the sliding cavity 10 is symmetrically arranged on the inner wall of the mounting base 4. A limiting block 11 is slidably connected inside the sliding cavity 10. One side of the limiting block 11 extends out of the sliding cavity 10, and a pull rod 12 is fixedly connected to the other side. The other end of the pull rod 12 extends out of the mounting base 4 and is fixedly connected to a pull block 13. A spring 14 is sleeved on the outer wall of the pull rod 12. One end of the spring 14 is fixedly connected to the limiting block 11, and the other end is fixedly connected to the inner wall of the sliding cavity 10. A limiting groove 15 matching the limiting block 11 is opened on the outer wall of the fixing sleeve 3. In its natural state, the spring 14 is compressed, and its restoring force pushes the limiting block 11 outward, causing a portion of it to protrude from the inner wall surface of the mounting base 4. During installation, the pull block 13 is pulled through the pull rod 12 to drive the limiting block 11 into the sliding cavity 10. Then, the mounting base 4 is fitted onto the fixing sleeve 3. When the mounting base 4 is fully fitted into place, that is, when the limiting block 11 slides to align with the preset limiting groove 15 on the outer wall of the fixing sleeve 3, the preload of the spring 14 will instantly pop the limiting block 11 out and lock it into the limiting groove 15, thereby forming a mechanical interlock and firmly locking the mounting base 4 onto the fixing sleeve 3. During disassembly, simply pull the pull block 13 outwards, and the limit block 11 will be actively pulled back into the sliding cavity 10 via the pull rod 12 to release the lock and remove the entire device. The continuous clamping force provided by the spring 14 ensures the lock's firmness and can effectively resist the vibration generated during concrete pouring, preventing the duckbill gate 2 from accidentally loosening and ensuring operational safety. Moreover, it makes the disassembly and assembly of the duckbill gate 2 more convenient, thus facilitating the removal and cleaning of the duckbill gate 2 by the staff.

[0018] More specifically, a positioning block 16 is fixedly connected to the outer wall of the fixed sleeve 3, and an anti-misalignment groove 17 matching the positioning block 16 is provided on the inner wall of the mounting base 4. There is only one unique relative angle between the mounting base 4 and the fixed sleeve 3, which allows the positioning block 16 to be smoothly embedded into the anti-misalignment groove 17. This ensures that the flat and elongated outlet direction of the duckbill gate 2 can be accurately positioned every time, avoiding the possibility of incorrect installation due to human negligence, which could affect the discharge direction and pouring effect, or even damage the equipment. Secondly, it greatly improves assembly efficiency. The clear positioning feature eliminates the need for operators to visually judge or repeatedly adjust, enabling "blind operation" for one-time rapid alignment and installation, further shortening the installation time and ensuring the consistency of installation quality each time.

[0019] More specifically, the corners of the limit block 11 extending out of the top of the sliding cavity 10 are all sloped. When the mounting base 4 is fitted onto the fixing sleeve 3, the outer wall of the fixing sleeve 3 will press the slope of the limit block 11, causing it to slide automatically into the sliding cavity 10. This eliminates the need for manual pulling of the pull block 13 to allow the limit block 11 to enter the sliding cavity 10, thus making the installation of the duckbill gate 2 more convenient.

[0020] More specifically, all corners of the pull block 13 are rounded, which greatly improves operational safety, eliminates sharp edges and corners, and prevents workers from getting their hands cut when operating in a hurried or dimly lit construction environment. The outer wall of the pull block 13 is covered with an anti-slip sleeve, which increases the friction between the hand and the pull block 13, ensuring that even if the worker's hands are wet, covered in mud, or wearing gloves, they can still firmly grip the pull block 13 and apply sufficient pulling force to unlock the device, effectively preventing slippage. This makes the disassembly operation easier and more reliable, improving the overall user experience.

[0021] More specifically, the adjustment assembly includes a clamping rod 7 that is slidably connected between two adjustment boxes 6, and the clamping rod 7 is symmetrically arranged between the two adjustment boxes 6. Both ends of the clamping rod 7 extend into the interior of the adjustment box 6 and are fixedly connected to a sliding block 8. The sliding block 8 is slidably connected to the inner wall of the adjustment box 6. The adjustment box 6 is provided with a long groove 9 that matches the clamping rod 7. The adjustment box 6 is provided with a drive assembly for making the two sliding blocks 8 move synchronously. When the drive assembly operates, it synchronously drives the sliding blocks 8 within the two regulating boxes 6 to move towards or away from each other. During the towards-each-other movement, the sliding blocks 8, through the clamping rod 7, evenly compress the flexible pipe wall of the duckbill gate 2 from both sides, causing deformation, narrowing the outlet gap, and reducing the discharge rate. During the away-each-other movement, the clamping force is released, and the duckbill gate 2 opens under its own elastic restoring force or the gravity of the internal concrete, increasing the discharge rate. The long groove 9 provides the necessary travel space for the reciprocating motion of the clamping rod 7, thus achieving precise and linear control of the concrete flow rate. This allows the outlet gap size to change steplessly and linearly, enabling the operator to precisely control the concrete flow rate like adjusting a faucet, which is crucial for ensuring pouring quality.

[0022] More specifically, the drive assembly includes a bidirectional lead screw 18 rotatably connected to one end of the inner wall of the adjustment box 6, the bidirectional lead screw 18 passing through the sliding block 8 and threadedly connected to the sliding block 8, and a first bevel gear 19 fixedly connected to the other end of the bidirectional lead screw 18, a second bevel gear 22 meshing with one side of the first bevel gear 19, the first bevel gear 19 and the second bevel gear 22 being rotatably connected to the inner wall of the adjustment box 6, a rotating rod 23 fixedly connected between the two second bevel gears 22, a rotating shaft 20 fixedly connected to one side of one of the first bevel gears 19, and the other end of the rotating shaft 20 extending out of the adjustment box 6 and fixedly connected to a handwheel 21; Rotating the handwheel 21 drives the rotating shaft 20 and the first bevel gear 19 fixed to it to rotate. The first bevel gear 19 drives the second bevel gear 22, which meshes perpendicularly with it, thereby turning the rotational motion 90 degrees and transmitting it to the "rotating rod 23" that runs through the two adjustment boxes 6. The rotation of the rotating rod 23 will drive the second bevel gear 22 and the first bevel gear 19 (i.e., another double-acting screw 18) in the other adjustment box 6 to rotate synchronously. Through precise gear matching, the rotation direction and speed of the two double-acting screws 18 are ensured to be completely consistent, thereby ensuring the high synchronization of the movement of the sliding blocks 8 on both sides. The operator only needs to turn the handwheel 21 in a single position to complete the opening adjustment of the entire discharge port. The operation is very convenient and intuitive, especially in construction environments with limited space.

[0023] As can be seen from the above, the specific embodiments of this utility model are as follows: When the device is in use, the operator rotates the handwheel 21 to drive the rotating shaft 20 and the first bevel gear 19 fixed thereto to rotate. The first bevel gear 19 drives the second bevel gear 22, which meshes perpendicularly with it, thereby turning the rotational motion 90 degrees and transmitting it to the "rotating rod 23" that runs through the two regulating boxes 6. The rotation of the rotating rod 23 will drive the second bevel gear 22 and the first bevel gear 19 (i.e., another double-acting screw 18) in the other regulating box 6 to rotate synchronously. When the double-acting screw 18 rotates, it will synchronously drive the sliding blocks 8 in the two regulating boxes 6 to move towards or away from each other. When moving towards each other, the sliding blocks 8 squeeze the flexible tube wall of the duckbill gate 2 evenly from both sides through the clamping rod 7, causing it to deform, narrowing the outlet gap and reducing the output. When moving away from each other, the clamping force is released, and the duckbill gate 2 opens under the action of its own elastic restoring force or the gravity of the internal concrete, increasing the output. The long groove 9 provides the necessary travel space for the reciprocating motion of the clamping rod 7, thus achieving precise and linear control of the concrete flow rate. This allows the outlet gap size to change steplessly and linearly, enabling the operator to precisely control the concrete flow rate like adjusting a faucet. When the duckbill gate 2 needs to be disassembled for cleaning, pulling the pull block 13 outward will actively pull the limit block 11 back into the sliding cavity 10 via the pull rod 12, thereby unlocking the device and allowing the entire device to be removed. This facilitates the cleaning of the inside of the duckbill gate 2 by the staff. After cleaning, the mounting base 4 is fitted onto the fixed sleeve 3. The inclined surface of the limiting block 11 decomposes the vertically downward installation force into a horizontal component, forcing the limiting block 11 to overcome the elastic force of the spring 14 and retract into the sliding cavity 10. When the mounting base 4 is fully fitted into place, that is, when the limiting block 11 slides to align with the preset limiting groove 15 on the outer wall of the fixed sleeve 3, the preload of the spring 14 will instantly pop the limiting block 11 out and lock it into the limiting groove 15, thereby forming a mechanical interlock and firmly locking the mounting base 4 onto the fixed sleeve 3. The device can then be used normally.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leakage prevention device for the discharge port of a concrete hopper for a trolley, comprising a hopper body (1), characterized in that, The lower end of the hopper body (1) is connected to a duckbill gate (2) at the discharge port. The lower end of the outer wall of the hopper body (1) is fixedly connected to a fixing sleeve (3). The top of the duckbill gate (2) is fixedly connected to a mounting seat (4) that matches the fixing sleeve (3). The mounting seat (4) is provided with a limiting component for fixing it to the outer wall of the fixing sleeve (3). Symmetrical connecting rods (5) are fixedly connected to both sides of the bottom of the mounting seat (4). The lower ends of the two connecting rods (5) on the same side are fixedly connected to an adjustment box (6). An adjustment component for adjusting the discharge amount is provided between the two adjustment boxes (6).

2. The anti-leakage device for the discharge port of a concrete hopper for a trolley according to claim 1, characterized in that: The limiting component includes a sliding cavity (10) opened in the inner wall of the mounting base (4), and the sliding cavity (10) is symmetrically arranged on the inner wall of the mounting base (4). A limiting block (11) is slidably connected inside the sliding cavity (10). One side of the limiting block (11) extends out of the sliding cavity (10), and the other side is fixedly connected to a pull rod (12). The other end of the pull rod (12) extends out of the mounting base (4) and is fixedly connected to a pull block (13). A spring (14) is sleeved on the outer wall of the pull rod (12). One end of the spring (14) is fixedly connected to the limiting block (11), and the other end is fixedly connected to the inner wall of the sliding cavity (10). A limiting groove (15) matching the limiting block (11) is opened on the outer wall of the fixing sleeve (3).

3. The anti-leakage device for the discharge port of a concrete hopper for a trolley according to claim 2, characterized in that: The outer wall of the fixed sleeve (3) is fixedly connected to the positioning block (16), and the inner wall of the mounting base (4) is provided with a foolproof groove (17) that matches the positioning block (16).

4. The anti-leakage device for the discharge port of a concrete hopper for a trolley according to claim 2, characterized in that: The corner of the top of the side of the limiting block (11) extending out of the sliding cavity (10) is set with a slope.

5. The anti-leakage device for the discharge port of a concrete hopper for a trolley according to claim 2, characterized in that: All corners of the pull block (13) are rounded, and the outer wall of the pull block (13) is fitted with an anti-slip sleeve.

6. The anti-leakage device for the discharge port of a concrete hopper for a trolley according to claim 1, characterized in that: The adjustment assembly includes a clamp (7) that is slidably connected between two adjustment boxes (6), and the clamp (7) is symmetrically arranged between the two adjustment boxes (6). Both ends of the clamp (7) extend into the interior of the adjustment box (6) and are fixedly connected to a sliding block (8). The sliding block (8) is slidably connected to the inner wall of the adjustment box (6). The adjustment box (6) is provided with a long groove (9) that matches the clamp (7). The adjustment box (6) is provided with a drive assembly for making the two sliding blocks (8) move synchronously.

7. A leakage prevention device for the discharge port of a concrete hopper for a trolley according to claim 6, characterized in that: The drive assembly includes a bidirectional lead screw (18) rotatably connected to one end of the inner wall of the adjustment box (6), the bidirectional lead screw (18) passing through the sliding block (8), and the bidirectional lead screw (18) being threadedly connected to the sliding block (8). The other end of the bidirectional lead screw (18) is fixedly connected to a first bevel gear (19), and a second bevel gear (22) is meshed with one side of the first bevel gear (19). The first bevel gear (19) and the second bevel gear (22) are rotatably connected to the inner wall of the adjustment box (6). A rotating rod (23) is fixedly connected between the two second bevel gears (22). A rotating shaft (20) is fixedly connected to one side of one of the first bevel gears (19), and the other end of the rotating shaft (20) extends out of the adjustment box (6) and is fixedly connected to a handwheel (21).

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