A concrete hopper

Abstract

The utility model relates to concrete hopper gate structure technical field discloses a kind of concrete hoppers, including rack and the hopper body of fixed connection on rack, there is the gate body for controlling the opening degree of hopper body bottom opening on rack pair rotation connection, gate tooth is equipped on gate body, rack is slidably connected with rack, rack is located between two gate bodies and rack is simultaneously engaged with the gate tooth on two gate bodies, rack is connected with the drive mechanism for driving rack sliding relative to rack.

Description

Technical Field

[0001] This utility model relates to the technical field of concrete hopper gate structure, specifically to a concrete hopper. Background Technology

[0002] The casting of precast T-beams is accomplished using a concrete hopper. During the casting process, the hopper gate is opened, and the concrete in the hopper is automatically poured downwards into the forming mold. Most current hopper gates are jaw gates, which consist of two gate bodies that are rotatably connected to the bottom of the hopper in pairs. Both gate bodies are equipped with gate teeth that mesh with each other. When either gate body is rotated, the meshing of the gate teeth on the two gate bodies causes both gate bodies to rotate simultaneously, thereby adjusting the size of the opening at the bottom of the hopper and thus regulating the material discharge speed.

[0003] Currently, when rotating the gate body, the material feeding speed is partially controlled by manually pushing and pulling the gate body. Manual control is labor-intensive and lacks precision, making it difficult to control the thickness of each pour. Pouring too thick a layer can cause defects such as honeycomb, pitting, and voids, while pouring too thin a layer will fail to meet design strength requirements and cause concrete segregation during vibration, affecting the overall structural stability of the precast T-beam. Therefore, some hoppers are equipped with electric actuators. These actuators, controlled by remote signals, push and pull the gate body to rotate, reducing manual labor intensity and improving control precision, effectively enhancing the quality of precast T-beam pouring.

[0004] Although existing technologies using electric actuators can improve the casting quality of precast T-beams, in actual use, adjusting the size of the bottom opening of the hopper requires driving the gate body to rotate relative to the hopper. To ensure that the electric actuator can stably and effectively push and pull the gate body at different angles, the output end of the electric actuator needs to be hinged to one of the gate bodies, and then the side wall of the electric actuator needs to be hinged to the frame or hopper. This installation structure is complex, and the electric actuator rotates relative to the hopper during use, posing a certain safety hazard to the space around the hopper. In addition, the electric actuator can only be rotatably connected to one of the gate bodies. When driving the gate body to rotate, one gate body is subjected to the pushing and pulling force of the electric actuator, while the other gate body rotates relative to the other gate body under the transmission of the gate teeth. The force forms and directions of the two gate bodies are different, resulting in poor gate structure stability and affecting the casting quality. Utility Model Content

[0005] The present invention aims to provide a concrete hopper to solve the problem of poor stability of gates used in hoppers in the prior art.

[0006] To solve the above problems, the present invention adopts the following technical solution: a concrete hopper, including a frame and a hopper body fixedly connected to the frame, a pair of gate bodies for controlling the opening degree of the bottom opening of the hopper body are rotatably connected to the frame, the gate bodies are provided with gate teeth, a rack is slidably connected to the frame, the rack is located between the two gate bodies and the rack meshes with the gate teeth on the two gate bodies at the same time, and a drive mechanism for driving the rack to slide relative to the frame is connected to the frame.

[0007] The principles and beneficial effects of this application are as follows: In this application, two gate bodies are rotatably connected to the frame in pairs. When the two gate bodies rotate relative to the bottom opening of the hopper, the opening of the hopper can be adjusted, thereby regulating the feeding speed of the hopper. In addition, in this application, a rack is slidably connected to the frame. The rack is located between the two gate bodies, and each side of the rack is provided with meshing teeth that mesh with the gate teeth on the two gate bodies. When the rack is driven vertically by the drive mechanism connected to the frame, the rack can simultaneously drive the two gate bodies to rotate, thereby regulating the feeding speed of the hopper.

[0008] Compared to the existing technology that uses an electric push rod on one side of the hopper, this application utilizes a drive mechanism to move the rack, which slides vertically. Therefore, the drive mechanism does not oscillate relative to the hopper as in the prior art, avoiding safety hazards to the surrounding space and requiring less space, thus facilitating the pouring process. Furthermore, when the rack slides vertically to drive the two gate bodies to rotate, the two gate bodies experience symmetrical forces in the horizontal direction. This ensures uniform force on the hopper during gate rotation, resulting in a stable gate structure and enabling consistent material feeding speed adjustment and the entire feeding process.

[0009] Preferably, as an improvement, the drive mechanism includes a base, an output motor, a gear set, a drive screw, and a push rod. The base is fixedly connected to the frame, the output motor is fixedly connected to the base, the gear set is connected between the output motor and the drive screw, and the push rod is slidably connected to the base and rotatably connected to the drive screw. A connecting rod is rotatably connected between the push rod and the rack.

[0010] In this design, the output shaft of the output motor drives the push rod to extend or retract from the base via a gear set and a drive screw. When the push rod extends or retracts, the rack can be pushed and pulled vertically relative to the hopper by the connecting rod. The structure is simple and easy to control.

[0011] Preferably, as an improvement, a manual rotation mechanism is connected to the output shaft of the output motor.

[0012] In practical applications, when the remote control signal is interfered with or the electro-hydraulic system malfunctions, the output motor cannot continue to work, resulting in the operator being unable to continue using the controller to remotely control the gate opening. At this time, there may still be a large amount of concrete material remaining in the hopper to be poured, and in order to achieve the pouring effect within the same layer thickness, it is necessary to continue pouring. In this case, the existing drive mechanism obviously cannot continue pouring when there is a malfunction.

[0013] To address the aforementioned issues, this solution incorporates a manual rotation mechanism connected to the output shaft of the output motor. When the remote control signal is interfered with or the electro-hydraulic system malfunctions, causing the output motor to cease operation, the output shaft of the output motor can be manually driven to rotate via the manual rotation mechanism. The output shaft can then continue to drive the push rod to slide relative to the base via the gear set and drive screw. In abnormal situations, the material feeding speed of the hopper can be manually adjusted to ensure the casting quality of the precast T-beams.

[0014] Preferably, as an improvement, the manual rotation mechanism includes an extension shaft and an operating handle, the extension shaft being fixedly connected to the output shaft of the output motor, and the operating handle being connected to the extension shaft.

[0015] In this design, the extension shaft is connected between the operating handle and the output shaft of the output motor. The operator only needs to manually rotate the operating handle to drive the extension shaft and the output shaft of the output motor to rotate. The structure is simple and the manual operation is very convenient.

[0016] Preferably, as an improvement, a fixing mechanism is fixedly connected to the extension shaft, a movable mechanism that is movably connected to the fixing mechanism is connected to the operating handle, and a control mechanism for controlling the connection between the movable mechanism and the fixing mechanism is connected to the output motor.

[0017] In this design, a fixed mechanism is fixedly connected to the extension shaft, a movable mechanism connected to the fixed mechanism is connected to the operating handle, and a control mechanism is connected to the output motor. The control mechanism controls the connection between the movable mechanism and the fixed mechanism when the output motor stops working due to malfunction or other reasons. Therefore, under normal conditions, the output motor rotates normally, driving the push rod to rotate. The push rod pushes and pulls the connecting rod, driving the rack to slide vertically, causing the gate body to rotate and precisely controlling the material feeding speed. When the output motor cannot be controlled due to abnormality or malfunction, the control mechanism controls the connection between the movable mechanism and the fixed mechanism. At this time, the movable mechanism and the fixed mechanism can rotate synchronously. Therefore, the operating handle can be used to drive the movable mechanism and the fixed mechanism to rotate. When the fixed mechanism rotates, it drives the output shaft of the output motor to rotate, allowing the output motor to continue driving the push rod to extend and retract relative to the base, controlling the material feeding speed of the hopper and ensuring that the hopper pouring operation can continue to be completed.

[0018] Furthermore, this solution includes a control mechanism. This mechanism is used to control the connection between the movable and fixed mechanisms when the output motor experiences a remote control signal failure or an electro-hydraulic system failure. Under normal conditions, the movable and fixed mechanisms are not connected. Therefore, when the output motor is working normally, its output shaft can only drive the fixed mechanism to rotate via the extended shaft, and cannot drive the movable mechanism or the operating handle. This effectively reduces the ineffective power output when the output motor is working normally, improving the stability of the output motor control. More importantly, when the output motor is working normally, the movable mechanism and the operating handle cannot rotate relative to the base, preventing the operating handle from constantly following the fixed mechanism and effectively avoiding the situation of the operating handle spinning idly. It also prevents the operator from being injured by the rotating operating handle. Moreover, when it is necessary to use the operating handle to drive the output motor in reverse, the output motor is in a stopped state. At this time, even if the operating handle is connected to the fixed mechanism and the output motor through the movable mechanism, the operating handle will not rotate, allowing the operator to use the operating handle safely and avoiding injury to the operator.

[0019] Preferably, as an improvement, the fixing mechanism includes a fixed turntable, the movable mechanism includes a movable turntable, and the fixed turntable and the movable turntable are provided with interlocking holes and rods.

[0020] In this design, the fixed turntable and the movable turntable are connected by interlocking rods and sockets. When the movable turntable approaches the fixed turntable, the rods and sockets interlock, allowing the movable and fixed turntables to connect and transmit power. At other times, the movable and fixed turntables are far apart, the rods retract from the slots, and the output motor drives the fixed turntable to rotate without driving the movable turntable or the manual rotation mechanism. The design is simple, easy to connect, and provides stable transmission.

[0021] Preferably, as an improvement, a sleeve is fixedly connected to the output motor, both the fixed turntable and the movable turntable are located inside the sleeve, and a slide block is slidably connected inside the sleeve, with the movable turntable rotatably connected to the slide block; a limiting ring is fixedly connected to the sleeve, and the slide block is located between the limiting ring and the fixed turntable.

[0022] In this design, the sleeve structure provides containment and protection for both the movable and fixed turntables, allowing the movable turntable to connect or disconnect from the fixed turntable more safely and stably. Simultaneously, a sliding block is connected within the sleeve, enabling the movable turntable to rotate smoothly relative to the sleeve. This allows the insertion rod to be easily inserted into the insertion hole. Furthermore, it facilitates subsequent operation by using the operating handle to drive the movable turntable to rotate, which in turn drives the output shaft of the output motor, making manual adjustment of the gate opening easier and more convenient. Additionally, a limiting sleeve is fixedly connected to the sleeve, using a limiting ring to limit the sliding of the sliding block, preventing it from sliding freely outside the sleeve and causing control structure failure.

[0023] Preferably, as an improvement, the control mechanism includes an elastic support and mutually repelling electromagnets and permanent magnets, wherein the electromagnets are connected to a fixed turntable, the permanent magnets are fixedly connected to a movable turntable, the elastic support is connected between a slide and a limiting collar, and when the electromagnets do not generate a repelling force on the permanent magnets, the slides approach the fixed turntable under the action of the elastic support, and the movable turntable is connected to the fixed turntable.

[0024] In this solution, an elastic support and mutually repelling electromagnets and permanent magnets are used as the control mechanism. When the output motor fails due to a remote control signal failure or an electro-hydraulic system failure, the electromagnet is de-energized and there is no interaction force between the electromagnet and the permanent magnet. At this time, the movable turntable automatically approaches and connects with the fixed turntable under the elastic force of the elastic support. The operator can control the opening of the hopper by rotating the operating handle. When the output motor is energized and in working condition, the electromagnet is also energized synchronously with the output motor. At this time, the electromagnet repels the permanent magnet after being energized, causing the movable turntable to move away from the fixed turntable and disengage from it. The elastic support is compressed and stores force, so the output motor can only drive the fixed turntable to rotate, avoiding the movable turntable and the manual rotation mechanism from rotating together during the use of the output motor.

[0025] In this solution, the interaction between the electromagnet and the permanent magnet allows for convenient control of the connection or disconnection between the movable and fixed turntables. Specifically, the electromagnet repels the permanent magnet when energized, so when the output motor is powered on, the electromagnet is simultaneously energized, eliminating the need for additional control. This simplifies control. Furthermore, the electromagnet's magnetic force keeps the movable turntable away from the fixed turntable, effectively preventing the output motor from ineffectively driving the movable turntable and the operating handle, thus reducing energy consumption. When the output motor is de-energized, the electromagnet is also de-energized. At this point, the movable turntable connects to the fixed turntable under the elastic force of the elastic support, allowing manual control of the hopper gate opening via the operating handle. The entire control process is simple and minimizes ineffective energy consumption, reducing control costs.

[0026] Preferably, as an improvement, a guide rail is fixedly connected to the frame, and a rack is slidably connected to the guide rail.

[0027] In this solution, guide rails are used to limit and guide the rack, enabling the rack to slide vertically more smoothly and accurately, thus improving the stability of the gate opening adjustment process.

[0028] Preferably, as an improvement, a protective cover is fixedly connected to the frame, and the guide rail, rack, and the side of the gate body where the gate teeth are set are all located inside the protective cover. The side wall of the protective cover is provided with a lateral clearance groove that cooperates with the gate body, and the top of the protective cover is provided with a top clearance groove that cooperates with the connecting rod.

[0029] In this solution, a protective cover is used to shield and protect the guide rail, rack, and the meshing position between the rack and the gate teeth, reducing the risk of mechanical failure during adjustment and improving structural stability. Attached Figure Description

[0030] Figure 1 This is a front view (with hidden protective cover) of a concrete hopper according to Embodiment 1 of this utility model.

[0031] Figure 2 This is a schematic diagram of the driving mechanism in Embodiment 1 of this utility model.

[0032] Figure 3 for Figure 1 A magnified view of a portion of point A in the middle.

[0033] Figure 4 This is a partial cross-sectional view of the connection between the connecting rod and the push rod in Embodiment 1 of this utility model.

[0034] Figure 5 This is a schematic diagram of the driving mechanism in Embodiment 2 of this utility model.

[0035] Figure 6 for Figure 5 A schematic diagram showing the hidden output motor, base, and push rod.

[0036] Figure 7 for Figure 6 A cross-sectional view along the middle BB.

[0037] Figure 8 for Figure 6 Exploded view. Detailed Implementation

[0038] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings of the instruction manual include: frame 1, hopper body 2, gate body 3, gate tooth 301, guide rail 4, rack 5, meshing tooth 501, base 6, output motor 7, push rod 8, connecting rod 9, extension shaft 10, operating handle 11, protective cover 12, fixed turntable 13, insertion hole 1301, second chamfer 1302, movable turntable 14, insertion rod 15, first chamfer 1501, sleeve 16, slide block 17, sliding protrusion 1701, bearing 18, limiting collar 19, electromagnet 20, permanent magnet 21, compression spring 22. Example

[0039] This embodiment is as shown in the appendix. Figure 1 The diagram shows a concrete hopper comprising a frame 1 and a hopper body 2 fixedly connected to the frame 1 by welding. The hopper body 2 has openings at both the top and bottom. The top opening is used for transferring concrete into the hopper body 2, and the bottom opening is used for pouring the concrete from the hopper body 2 into a precast T-beam mold. Two paired gate bodies 3 are rotatably connected to the frame 1 via bearings. Rotation of the two gate bodies 3 changes the opening size of the bottom opening of the hopper body 2, thereby adjusting the speed at which the hopper body 2 pours concrete into the precast T-beam mold.

[0040] Combination Figure 1 and Figure 3 In this embodiment, a vertically arranged guide rail 4 is fixedly connected to the frame 1 by screws. A rack 5 is vertically slidably connected to the guide rail 4. The rack 5 has meshing teeth 501 on both the left and right sides. Each gate body 3 is formed with gate teeth 301. The gate teeth 301 of the two gate bodies 3 mesh with the meshing teeth 501 on both sides of the rack 5. When the rack 5 slides vertically, it can drive the two gate bodies 3 to rotate and adjust the bottom opening of the hopper body 2, effectively controlling the feeding speed of the hopper body 2.

[0041] To precisely control the vertical sliding dimension of the rack 5 and thus accurately adjust the feeding speed of the hopper body 2, in this embodiment, a drive mechanism for driving the rack 5 to slide vertically relative to the frame 1 is connected to the frame 1. For example... Figure 2 As shown, the drive mechanism includes a base 6, an output motor 7, a gear set, a drive screw, and a push rod 8, wherein the base 6 and... Figure 1The frame 1 is fixed by screws or other means. The gear set is rotatably connected to the base 6 via bearings. The drive screw is rotatably connected to the base 6, and one gear in the gear set is fixedly connected to the drive screw. The push rod 8 has a sliding groove, and the base 6 has a protrusion that slides with the sliding groove. The push rod 8 and the drive screw are threaded together. When the output shaft of the output motor 7 rotates, the power of the output shaft is transmitted to the push rod 8 through the gear set and the drive screw. Due to the limiting and guiding effect of the protrusion and the sliding groove, the push rod 8 can only slide along the base 6 under the drive of the drive screw and cannot rotate. When the push rod 8 slides relative to the base 6, it can extend or retract, thus achieving a push-pull effect. Since setting the gear set and drive screw within the base 6 to drive the push rod 8 to extend or retract is conventional technology in this field, the base 6 and its internal structure will not be described in detail here. Figure 4 A connecting rod 9 is hinged between the end of the push rod 8 and the rack 4. When the push rod 8 extends or retracts into the base 6, the rack 5 can slide vertically by pushing and pulling it through the connecting rod 9.

[0042] like Figure 1 As shown, in this embodiment, a manual rotation mechanism is connected to the output shaft of the output motor 7. The manual rotation mechanism includes an extension shaft 10 and an operating handle 11. The extension shaft 10 is fixedly connected to the output shaft of the output motor 7 by screws, and the operating handle 11 is L-shaped and fixedly connected to the extension shaft 10 by screws. Furthermore, in conjunction with... Figure 4 To improve safety during use, in this embodiment, a protective cover 12 is fixedly connected to the frame 1 by screws. The guide rail 4, rack 5 and the side of the gate body 3 on which the gate teeth 301 are set are all located inside the protective cover 12. The left and right sides of the protective cover 12 are provided with lateral clearance grooves that cooperate with the two gate bodies 3, and the top of the protective cover 12 is provided with a top clearance groove that cooperates with the connecting rod 9.

[0043] The specific implementation process is as follows: When the precast T-beam needs to be poured, the mixed concrete is transferred into the hopper body 2, and then the hopper body 2 is driven to walk along the mold of the precast T-beam. During the walking process, the concrete in the hopper body 2 is poured into the mold through the bottom opening of the hopper body 2. Since the pouring thickness needs to be controlled during the pouring process, it is necessary to adjust the opening of the bottom opening of the hopper body 2 in a timely manner to regulate the feeding speed of the hopper body 2. During adjustment, the output shaft of the output motor 7 can be rotated by the controller in the existing technology to adjust the length of the push rod 8 extending out of the base 6. When the length of the push rod 8 extending out of the base 6 changes, the push rod 8 pushes and pulls the rack 5 to slide in the vertical direction through the connecting rod 9. When the rack 5 slides, the meshing of the meshing teeth 501 and the gate teeth 301 drives the two gate bodies 3 to rotate, thereby changing the opening of the bottom opening of the hopper body 2 and adjusting the precise and stable adjustment of the feeding speed of the hopper body 2.

[0044] In addition, since an extension shaft 10 and an operating handle 11 are connected to the output shaft of the output motor 7 in this embodiment, when the output motor 7 fails to work due to interference with the remote control signal or a malfunction in the electro-hydraulic system during use, the operator can turn off the power of the output motor 7 and then manually rotate the operating handle 11 to manually rotate the output shaft of the output motor 7. Ultimately, the feeding speed of the hopper body 2 can be adjusted to ensure the casting quality. Example

[0045] The difference between Example 2 and Example 1 is that: [The text abruptly ends here, likely due to an incomplete sentence or a formatting error.] Figure 5 , Figure 6 and Figure 7 To further enhance safety during use, in this embodiment, a fixing mechanism is fixedly connected to the extension shaft 10, and a movable mechanism movably connected to the fixing mechanism is connected to the base 6. A control mechanism is connected to the output motor 7 to control the connection between the movable mechanism and the fixing mechanism when the output motor 7 stops working. In this embodiment, the fixing mechanism includes a fixed turntable 13 fixedly connected to one end of the extension shaft 10 extending beyond the base 6 by screws. The movable mechanism includes a movable turntable 14 directly opposite the fixed turntable 13. A plug-in rod 15 and a plug hole 1301 are provided between the movable turntable 14 and the fixed turntable 13 for mutual insertion and engagement.

[0046] Specifically, in combination Figure 7 and Figure 8 The insertion hole 1301 is provided on the fixed turntable 13, and the insertion rod 15 is fixedly connected to the movable turntable 14 on the side facing the fixed turntable 13 by screws. There are multiple insertion holes 1301 and multiple insertion rods 15. The multiple insertion holes 1301 are evenly arranged circumferentially along the central axis of the fixed turntable 13. At the same time, in order to facilitate the insertion of the insertion rod 15 into the insertion hole 1301, a first chamfer 1501 is provided at the end of the insertion rod 15, and a second chamfer 1302 is provided at the end of the insertion hole 1301 facing the movable turntable 14.

[0047] To facilitate stable control of the movable turntable 14 as it approaches or moves away from the fixed turntable 13, a sleeve 16 is fixedly connected to the housing of the output motor 7 by screws in this embodiment. The sleeve 16 is coaxially arranged with the extension shaft 10. A guide groove is formed inside the sleeve 16 along its axial direction. A slide block 17 is slidably connected inside the sleeve 16, and a sliding protrusion 1701 that mates with the guide groove is fixedly connected to the slide block 17, allowing the slide block 17 to slide stably relative to the sleeve 16. The movable turntable 14 and the slide block 17 are rotatably connected by a bearing 18. In addition, a limiting collar 19 is fixedly connected to the end of the sleeve 16 by screws in this embodiment. The limiting collar 19 limits the slide block 17, preventing it from sliding out of the sleeve 16. At the same time, the operating handle 11 in this embodiment is a straight rod. The operating handle 11 is eccentrically fixed to the movable turntable 14 by screws, and one end of the operating handle 11 protrudes out of the sleeve 16, allowing the operator to manually rotate the operating handle 11.

[0048] Combination Figure 7 and Figure 8 In this embodiment, the control mechanism includes an elastic support and a mutually repelling electromagnet 20 and a permanent magnet 21. The electromagnet 20 is fixedly connected to the fixed turntable 13 on the side facing the movable turntable 14 by screws. The permanent magnet 21 can be a neodymium iron boron magnet. The permanent magnet 21 is fixedly connected to the movable turntable 14 on the side facing the fixed turntable 13 by screws. In order to ensure the effect of the electromagnet 20 and the permanent magnet 21, in this embodiment, the electromagnet 20 and the permanent magnet 21 are located on the central axis of the output shaft of the output motor 7. The elastic support includes a compression spring 22 connected between the slide 17 and the limiting collar 19. The slide 17 has a mounting hole. One end of the compression spring 22 abuts against the bottom wall of the mounting hole, and the other end abuts against the limiting collar 19. Electromagnet 20 is connected in parallel with output motor 7. When output motor 7 is powered on, electromagnet 20 is powered on and generates magnetism. Under the mutual repulsion force between electromagnet 20 and permanent magnet 21, movable turntable 14 slides along sleeve 16 axially away from fixed turntable 13, and insert rod 15 can be removed from slot. When movable turntable 14 slides away from fixed turntable 13, it exerts a squeezing effect on compression spring 22. Compression spring 22 contracts and stores force. When electromagnet 20 is de-energized, compression spring 22 can automatically push movable turntable 14 to slide towards fixed turntable 13 and finally connect with fixed turntable 13.

[0049] The specific implementation process of this embodiment is as follows: In Embodiment 1, the operating handle 11 is always fixedly connected to the output shaft of the output motor 7 via the extension shaft 10. Therefore, when the output motor 7 is working, it will drive the extension shaft 10 and the operating handle 11 to rotate synchronously. When the operating handle 11 rotates, it poses a safety risk to the surrounding space, especially to the surrounding operators. In this embodiment, when the output motor 7 is working normally, the electromagnet 20 is energized synchronously with the output motor 7. Under the mutual repulsive force between the electromagnet 20 and the permanent magnet 21, the movable turntable 14 slides away from the fixed turntable 13, causing the insertion rod 15 to exit the slot. At this time, the movable turntable 14, the slide block 17, and the operating handle 11 will not rotate with the output shaft of the output motor 7, avoiding the risk of the operating handle 11 injuring the construction personnel. When the output motor 7 stops working, the electromagnet 20 is de-energized, and the repulsive force between the electromagnet 20 and the permanent magnet 21 disappears. At this time, the movable turntable 14 slides towards the fixed turntable 13 under the elastic force of the compression spring 22, and the insertion rod 15 is inserted into the slot. At this time, the operator can rotate the output shaft of the output motor 7 in the opposite direction through the operating handle 11 and finally control the feeding speed of the hopper body 2, making it safer and more energy-efficient to use.

[0050] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A concrete hopper, comprising a frame and a hopper body fixedly connected to the frame, wherein a pair of gate bodies for controlling the opening degree of the bottom opening of the hopper body are rotatably connected to the frame, characterized in that: The gate body is provided with gate teeth, and a rack is slidably connected to the frame. The rack is located between the two gate bodies and simultaneously meshes with the gate teeth on the two gate bodies. A drive mechanism for driving the rack to slide relative to the frame is connected to the frame.

2. A concrete hopper according to claim 1, characterized in that: The drive mechanism includes a base, an output motor, a gear set, a drive screw, and a push rod. The base is fixedly connected to the frame, the output motor is fixedly connected to the base, the gear set is connected between the output motor and the drive screw, and the push rod is slidably connected to the base and rotatably connected to the drive screw. A connecting rod is rotatably connected between the push rod and the rack.

3. A concrete hopper according to claim 2, characterized in that: A manual rotation mechanism is connected to the output shaft of the output motor.

4. A concrete hopper according to claim 3, characterized in that: The manual rotation mechanism includes an extension shaft and an operating handle. The extension shaft is fixedly connected to the output shaft of the output motor, and the operating handle is connected to the extension shaft.

5. A concrete hopper according to claim 4, characterized in that: A fixing mechanism is fixedly connected to the extension shaft, a movable mechanism that is movably connected to the fixing mechanism is connected to the operating handle, and a control mechanism for controlling the connection between the movable mechanism and the fixing mechanism is connected to the output motor.

6. A concrete hopper according to claim 5, characterized in that: The fixed mechanism includes a fixed turntable, and the movable mechanism includes a movable turntable. The fixed turntable and the movable turntable are provided with interlocking holes and rods.

7. A concrete hopper according to claim 6, characterized in that: A sleeve is fixedly connected to the output motor. Both the fixed turntable and the movable turntable are located inside the sleeve. A slide block is slidably connected inside the sleeve, and the movable turntable is rotatably connected to the slide block. A limit ring is fixedly connected to the sleeve, and the slide block is located between the limit ring and the fixed turntable.

8. A concrete hopper according to claim 7, characterized in that: The control mechanism includes an elastic support and electromagnets and permanent magnets that repel each other. The electromagnets are connected to the fixed turntable, the permanent magnets are fixedly connected to the movable turntable, and the elastic support is connected between the slide and the limiting collar. When the electromagnet does not generate a repulsive force on the permanent magnet, the slide moves closer to the fixed turntable under the action of the elastic support. The movable turntable and the fixed turntable are connected to each other.

9. A concrete hopper according to any one of claims 1-8, characterized in that: The frame is fixedly connected to a guide rail, and the rack is slidably connected to the guide rail.

10. A concrete hopper according to claim 9, characterized in that: A protective cover is fixedly connected to the frame. The guide rail, rack, and gate body with the gate teeth are all located inside the protective cover. The side wall of the protective cover is provided with a lateral clearance groove that cooperates with the gate body. The top of the protective cover is provided with a top clearance groove that cooperates with the connecting rod.

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