Material feeding equipment

Abstract

The utility model relates to the technical field of plant fiber processing, in particular to material feeding equipment which comprises a rack, a sliding device, a lifting device and a hopper, and a limiting block is arranged at the top of the rack; the sliding device comprises a lifting frame, a swing arm and a traction rod, the middle of the swing arm is hinged to the lifting frame, and one end of the swing arm is hinged to one end of the traction rod. The lifting device is arranged on the rack; the output end of the lifting device is connected with the lifting frame; the lifting device can drive the lifting frame to lift relative to the rack; the two sides of the hopper are hinged to the lifting frame, a discharging opening is formed in the bottom of the hopper, and a gate mechanism is hinged to the discharging opening and can automatically block the discharging opening. The other end of the traction rod is hinged to the outer wall of the end, close to the discharging port, of the hopper, and the end, close to the hopper, of the traction rod is hinged to the input end of the gate mechanism. The material feeding equipment is slightly influenced by the environment in the using process, the needed discharging space is small, and materials are not prone to scattering in the feeding and discharging processes.

Description

Technical Field

[0001] The utility model relates to the technical field of plant fiber processing, in particular to a material feeding device. Background Art

[0002] In the field of plant fiber product manufacturing, the processing flow is generally to first make the dry fiber raw material into fiber slurry, then filter the fiber slurry into shape, and finally heat press to get the plant fiber product. In the plant fiber pulping stage, workers need to put the dry plant fiber pieces or plant fiber fragments into the elevator, and then the elevator will crush the plant fiber pieces or plant fiber fragments, and then transport them to the pulping tank through the conveyor belt to add water and additives for stirring, and then get the plant fiber slurry.

[0003] In the stage of loading plant fibers, loading is mainly done by elevators. At present, bucket elevators are generally used. Bucket elevators generally use a multi-section track setting. The multi-section tracks are set in a continuous manner and use the changes in the tracks to force the bucket to flip over in order to achieve the purpose of dumping materials. For example, a lifting device for loading a hopper disclosed in the patent with publication number CN210504363U adopts an inclined track frame and a horizontal track setting, but such a design results in a large overall space occupation and is not suitable for lifting at a large height. At the same time, during the process of flipping the hopper, the space required for the hopper to flip is large and is easily restricted by the environment. Moreover, due to the use of a flipping discharge method, when the hopper flips, the material inside is easily thrown out due to inertia. Utility Model Content

[0004] In order to overcome one of the deficiencies of the prior art, the purpose of the utility model is to provide a material feeding device, which is less affected by the environment during use, requires a small unloading space, and is not prone to material scattering during the feeding process.

[0005] In order to solve the above problems, the technical solutions adopted by the utility model are as follows:

[0006] A frame, with a limit block set on the top;

[0007] The sliding device comprises a lifting frame, a swing arm and a pulling rod, wherein the middle portion of the swing arm is hinged to the lifting frame, and one end of the swing arm is slidably hinged to one end of the pulling rod;

[0008] A lifting device is arranged on the frame; the output end of the lifting device is connected to the lifting frame; the lifting device can drive the lifting frame to rise and fall relative to the frame;

[0009] A hopper, both sides of which are hinged on the lifting frame, a discharge port is provided at the bottom of the hopper, a gate mechanism is hinged on the discharge port, and the gate mechanism can automatically block the discharge port;

[0010] Among them, the other end of the pulling rod is hinged on the outer wall of one end of the hopper close to the discharge port, and the middle part of the pulling rod is hinged to the input end of the gate mechanism; when the lifting frame gradually approaches the limit block, the other end of the swing arm first contacts the limit block and produces relative displacement, and the other end of the swing arm can gradually pull the bottom of the hopper to swing outward through the pulling rod and delay driving the gate mechanism to gradually open the discharge port.

[0011] Furthermore, the gate mechanism includes a sealing plate and a driving arm, one side of the sealing plate is hinged on the side of the discharge port close to the swing arm, and a reset mechanism is provided on the hopper, and the reset mechanism can drive the sealing plate to block the discharge port, and a push arm is provided on the side where the sealing plate is hinged to the discharge port, one end of the driving arm is hinged to the push arm, and a limiting groove is provided on the other end of the driving arm, and the middle part of the pulling rod is slidably hinged in the limiting groove.

[0012] Furthermore, the reset mechanism is a reset torsion spring, the sealing plate and the discharge port are hinged via a rotating shaft, the reset torsion spring is sleeved on the rotating shaft, and two ends of the reset torsion spring are respectively in contact with the sealing plate and the outer wall of the hopper.

[0013] Furthermore, the hopper is provided with a locking block that cooperates with the movable side of the sealing plate, and a limiting step is provided on the side of the locking block close to the discharge port. The outward end of the locking block can be deformed, and the outward end of the locking block is located on the side of the limiting step and is provided with a slope. When the movable side of the sealing plate can be stuck on the limiting step, the sealing plate blocks the discharge port.

[0014] Furthermore, a support wheel is rotatably provided on the end of the locking block, and a support wheel that can rotate is also provided on the back of the sealing plate.

[0015] Furthermore, a limiting mechanism is arranged on the lifting frame, and a limiting groove cooperating with the limiting mechanism is arranged on the outer wall of the hopper. When the lifting frame drives the limiting mechanism to abut against the limiting block, the limiting mechanism can be pulled out from the limiting groove.

[0016] Furthermore, the limit mechanism includes a sliding rod, a wedge block, a limit pin and a return spring, the sliding rod movably inserted in the limit cylinder at the top of the lifting frame, the wedge block is arranged at the lower end of the sliding rod, and the wedge block is provided with an avoidance groove along the length direction of the sliding rod, the limit pin movably passes through the limit cylinder and one end can be inserted into the limit groove, and the other end of the limit pin also movably passes through the limit cylinder, and an end is arranged on the limit pin; the return spring is sleeved on the limit pin, and the two ends are respectively abutted with the end and the side of the limit cylinder away from the hopper; the upper end of the sliding rod is higher than the upper end of the swing arm; when the lifting frame drives the sliding rod to abut against the limit block, the end can cooperate with the wedge surface of the wedge block to pull the limit pin out of the limit groove.

[0017] Furthermore, tracks are provided on both sides of the frame, and both sides of the lifting frame are rollingly installed in the tracks through two sets of rollers.

[0018] Furthermore, a driving part is provided on one end of the swing arm close to the limit block, and the outward end of the driving part gradually tilts toward the side of the hopper away from the swing arm. An abutment wheel is rotatably provided on the end of the driving part, and the outer periphery of the abutment wheel can abut against the limit block.

[0019] Furthermore, the lifting device includes a lifting motor, a chain and a sprocket, two sprockets are provided and are rotatably arranged at the top and bottom of the frame respectively through a drive shaft, the chain is wound around the two sprockets, the lifting motor is installed on the bottom of the frame and the output end is connected to the drive shaft at the bottom, and the lifting frame is connected to the chain.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] A material loading device of the utility model improves the hopper on the basis of the existing elevator, and adopts the bottom discharging method, which can avoid the use of the flip-over dumping method for discharging, reduce the scattering of materials due to inertia during the discharging process, and at the same time, due to the use of the bottom discharging method, the required discharging space is relatively small, which is suitable for a narrow production environment. The swing arm and the limit block are used to make the swing arm swing, and then the bottom of the hopper is gradually pulled outward by the pulling rod, so that the material can be automatically unloaded after the movement is in place, and the gate mechanism can be driven to gradually open the discharging port with a lag, so that the material in the hopper can be discharged outward, and the entire loading process can adjust the discharging direction and open the discharging port at the same time, killing two birds with one stone, and no excessive control system is required, which reduces the equipment cost. The purely mechanical structure is set up, and the overall reliability is strong, which can adapt to complex working environments. The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of an embodiment of the utility model;

[0023] Figure 2 It is a right side view of an embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of the hopper in the lifting stage in the embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of the structure of the hopper in the unloading stage in the embodiment of the utility model;

[0026] Figure 5 It is a structural schematic diagram of the sliding device in the embodiment of the utility model;

[0027] Figure 6 It is a partial structural schematic diagram of a sliding device in another embodiment of the utility model;

[0028] Figure 7 yes Figure 6 A partial enlarged view of point A in the middle.

[0029] Description of Figure Numbers:

[0030] Frame 100, limit block 110, track 120, sliding device 200, lifting frame 210, swing arm 220, driving part 221, abutment wheel 222, pulling rod 230, limit mechanism 240, sliding rod 241, wedge block 242, limit pin 243, return spring 244, avoidance groove 245, end 246, roller 250, lifting device 300, lifting motor 310, chain 320, sprocket 330, drive shaft 340, hopper 400, discharge port 410, gate mechanism 420, sealing plate 421, driving arm 422, push arm 423, limit groove 424, rotating shaft 425, locking block 430, limit step 431, slope 432, support wheel 433, limit groove 440. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] See also Figures 1 to 7 The present application provides a material feeding device, including a frame 100, a sliding device 200, a lifting device 300 and a hopper 400. A limit block 110 is arranged on the top of the frame 100; the sliding device 200 includes a lifting frame 210, a swing arm 220 and a pulling rod 230. The middle part of the swing arm 220 is hinged to the lifting frame 210, and one end of the swing arm 220 is slidably hinged to one end of the pulling rod 230; the lifting device 300 is arranged on the frame 100; the output end of the lifting device 300 is connected to the lifting frame 210; the lifting device 300 can drive the lifting frame 210 to rise and fall relative to the frame 100; the two sides of the hopper 400 are hinged to the lifting frame 210, and the hopper 400 has a plurality of lifting devices. A discharge port 410 is provided at the bottom, and a gate mechanism 420 is hinged on the discharge port 410, and the gate mechanism 420 can automatically block the discharge port 410; the other end of the pulling rod 230 is hinged on the outer wall of one end of the hopper 400 close to the discharge port 410, and the middle part of the pulling rod 230 is hinged to the input end of the gate mechanism 420; when the lifting frame 210 gradually approaches the limit block 110, the other end of the swing arm 220 first contacts the limit block 110 and produces relative displacement, and the other end of the swing arm 220 can gradually pull the bottom of the hopper 400 to swing outward through the pulling rod 230 and delay driving the gate mechanism 420 to gradually open the discharge port 410.

[0033] In the above-mentioned embodiment, the center of the hopper 400 and the center of gravity of the lifting frame 210 are on a vertical plane, which can prevent the hopper 400 from tipping over due to the unstable center of gravity during the lifting stage. The gate mechanism 420 is mainly used to block the discharge port 410, and the main application scenario in this application is the feeding of dry plant fibers, so the gate mechanism 420 does not need to strictly block the discharge port 410. Of course, in some application scenarios, a seal can be provided between the gate mechanism 420 and the discharge port 410, so that fluid or granular materials can be lifted. Among them, in order to facilitate external equipment to load the hopper 400, an inclined groove is provided on the side of the upper end opening of the hopper 400 away from the swing arm 220, which is conducive to the loading of external equipment.

[0034] It should be noted that the lifting device 300 can be driven by a cylinder, a chain or a screw mechanism. The frame 100 is vertically arranged, so that the space occupied by the upper part thereof can be reduced. In addition, the lifting device 300 moves linearly on the frame 100. In order to facilitate the movement of the lifting device 300, in one embodiment of the present application, rails 120 are arranged on both sides of the frame 100, and both sides of the lifting frame 210 are rollingly installed in the rails 120 through two sets of rollers 250. Such an arrangement is conducive to the displacement of the lifting frame 210 relative to the frame 100.

[0035] The plant fiber raw material feeding equipment improves the hopper 400 on the basis of the existing elevator, and adopts the bottom discharge method, which can avoid the use of the flip-over dumping method for discharging, reduce the scattering of materials due to inertia during the discharging process, and at the same time, due to the use of the bottom discharge method, the required discharge space is relatively small, which is suitable for a narrow production environment. The swing arm 220 is used to swing with the limit block 110, and then the bottom of the hopper 400 is gradually pulled outward by the pulling rod 230, so that the material can be automatically unloaded after the movement is in place, and the gate mechanism 420 can be driven to gradually open the discharge port 410 with a lag, so that the material in the hopper 400 is discharged outward, and the entire feeding process can adjust the direction of the discharge and open the discharge port 410 at the same time, killing two birds with one stone, and at the same time, there is no need for too many control systems, reducing equipment costs, and adopting a purely mechanical structure setting, which is highly reliable overall and adaptable to complex working environments.

[0036] See also Figures 1 to 4, in order to realize that the pulling rod 230 swings toward one side of the swing arm 220 at the bottom of the pumping hopper 400, and at the same time, the gate mechanism 420 can be driven with lag to gradually open the discharge port 410. In one embodiment of the present application, the gate mechanism 420 includes a sealing plate 421 and a driving arm 422, one side of the sealing plate 421 is hinged on the side of the discharge port 410 close to the swing arm 220, a reset mechanism is provided on the hopper 400, and the reset mechanism can drive the sealing plate 421 to block the discharge port 410, a push arm 423 is provided on the side where the sealing plate 421 is hinged to the discharge port 410, one end of the driving arm 422 is hinged to the push arm 423, and a limiting groove 424 is provided on the other end of the driving arm 422, and the middle part of the pulling rod 230 is slidably hinged in the limiting groove 424. When the pulling rod 230 starts to pull the bottom of the hopper 400 to swing toward the side of the swing arm 220, the end of the corresponding end of the pulling rod 230 slides in the limiting groove 424; when the pulling rod 230 pulls the bottom of the hopper 400 to swing toward the side of the swing arm 220 to a preset angle, the end of the corresponding end of the pulling rod 230 just moves to the end of the limiting groove 424. When the pulling rod 230 continues to pull the bottom of the hopper 400 and gradually lifts it upward, the pulling rod 230 drives one end of the push arm 423 to rotate around the point where the sealing plate 421 and the discharge port 410 are mutually hinged through the driving arm 422, so that the movable end of the sealing plate 421 can gradually open the discharge port 410. On the contrary, when the lifting device 300 drives the lifting frame 210 to start to descend, the angle between the upper end of the driving arm 422 and the limit block 110 gradually decreases. At the same time, due to the deadweight of the hopper 400, the pulling rod 230 gradually lowers to the bottom of the hopper 400, so that the hopper 400 gradually resets and returns to a vertical state. At this time, the reset mechanism can force the sealing plate 421 to gradually block the discharge port 410. The reset mechanism in this application is a structure such as a coil spring. In this application, due to the linkage design, the reset mechanism does not adopt a cylinder-driven reset method. In the above-mentioned embodiment, one end of the swing arm 220 is slidably hinged with one end of the pulling rod 230. In fact, a sliding structure similar to the limiting groove 424 can also be provided on the swing arm 220, so that when one end of the pulling rod 230 is driven and pulled by the swing arm 220, the end of the pulling rod 230 can slide on the sliding structure of the swing arm 220, and the hinge function can also be realized.

[0037] Furthermore, in the above-mentioned embodiment, in order to facilitate the reset and adapt to the above-mentioned linkage structure, the reset mechanism is a reset torsion spring, the sealing plate 421 and the discharge port 410 are hinged by a rotating shaft 425, the reset torsion spring is mounted on the rotating shaft 425, and the two ends of the reset torsion spring are respectively in contact with the sealing plate 421 and the outer wall of the hopper 400. Among them, in the natural state, the reset torsion spring can force the sealing plate 421 to always press against the edge of the discharge port 410 to block the discharge port 410. After the bottom of the hopper 400 is pulled and lifted until the pulling rod 230 can pull the push arm 423 through the driving arm 422, the reset torsion spring begins to be gradually stressed and twisted.

[0038] In the above-mentioned embodiment, in the actual lifting process, when the hopper 400 is full of materials, it only relies on the reset torsion spring to force the sealing plate 421 to block the discharge port 410, which places very high requirements on the torsion of the reset torsion spring, and the reset torsion spring is also prone to fatigue. For this reason, in one embodiment of the present application, the hopper 400 is provided with a locking block 430 that cooperates with the movable side of the sealing plate 421, and a limiting step 431 is provided on the side of the locking block 430 close to the discharge port 410, and the outward end of the locking block 430 can be deformed, and the outward end of the locking block 430 is located on the side of the limiting step 431 and is provided with a slope 432. When the movable side of the sealing plate 421 can be stuck on the limiting step 431, the sealing plate 421 blocks the discharge port 410. The movable side of the sealing plate 421 is placed on the limiting step 431, which can greatly reduce the torque required by the reset torsion spring to force the sealing plate 421 to always block the discharge port 410 when the hopper 400 is loaded. At the same time, the deformable locking block 430 can also force the movable side of the sealing plate 421 to always fasten the discharge port 410 to a certain extent.

[0039] In some embodiments, in order to effectively isolate the hopper 400 from the ground or avoid contact with debris on the ground when it is at the loading station, in one embodiment of the present application, a support wheel 433 is rotatably provided on the end of the locking block 430, and a rotatable support wheel 433 is also provided on the back of the sealing plate 421. Such a configuration allows the weight of the hopper 400 and the material inside it to be supported by the support wheel 433 on the locking block and the support wheel 433 on the back of the sealing plate 421 during the non-lifting stage, which can effectively reduce the impact of the material in the hopper 400 on the lifting device 300 during the loading process, and can effectively protect the lifting device 300.

[0040] See also Figure 6 and Figure 7In order to prevent the entire feeding device from shaking due to the shaking of the hopper 400 during the lifting stage, in one embodiment of the present application, a limiting mechanism 240 is provided on the lifting frame 210, and a limiting groove 440 cooperating with the limiting mechanism 240 is provided on the outer wall of the hopper 400. When the lifting frame 210 drives the limiting mechanism 240 to abut against the limiting block 110, the limiting mechanism 240 can be pulled out of the limiting groove 440. In fact, the upper end of the limiting mechanism 240 is higher than the upper end of the swing arm 220, so that the limiting mechanism 240 contacts the limiting block 110 before the swing arm 220, and then when the swing arm 220 starts to pull the bottom of the hopper 400 to swing outward through the pulling rod 230, the limiting mechanism 240 can be pulled out of the limiting groove 440 to release the swing restriction on the hopper 400. The limiting mechanism 240 may be a structure configured by a trigger switch and a telescopic motor, or may be some connecting rod structures.

[0041] See also Figure 6 and Figure 7 In order to realize the function of the above-mentioned limiting mechanism 240, in one embodiment of the present application, the limiting mechanism 240 includes a sliding rod 241, a wedge block 242, a limiting pin 243 and a reset spring 244. The sliding rod 241 is movably inserted into the limiting cylinder 211 at the top of the lifting frame 210. The wedge block 242 is arranged at the lower end of the sliding rod 241. The wedge block 242 is provided with an avoidance groove 245 along the length direction of the sliding rod 241. The limiting pin 243 movably passes through the limiting cylinder 211 and one end of the limiting pin 243 can be inserted into the limiting groove 440. The other end of 43 also moves out of the limit cylinder 211, and an end 246 is provided on the limit pin 243; the return spring 244 is sleeved on the limit pin 243, and the two ends are respectively abutted against the end 246 and the side of the limit cylinder 211 away from the hopper 400; the upper end of the sliding rod 241 is higher than the upper end of the swing arm 220; when the lifting frame 210 drives the sliding rod 241 to abut against the limit block 110, the end 246 can cooperate with the wedge surface of the wedge block 242 to pull the limit pin 243 out of the limit groove 440.

[0042] In the above embodiment, the wedge-shaped surface of the wedge block 242 can force the limiting pin 243 to move to the side away from the limiting groove 440, and the return spring 244 is compressed. During the descending stage of the lifting device 300, due to the lack of the force of the limiting block 110 on the wedge block 242, the elastic force released by the return spring 244 can make the wedge block 242 rise in the limiting cylinder 211, and the limiting pin 243 is automatically inserted into the limiting groove 440 to relatively lock the hopper 400 and the lifting frame 210.

[0043] See again Figures 1 to 4 In order to facilitate the smooth relative displacement between the upper end of the swing arm 220 and the limit block 110, the two can adopt a sliding friction method during actual use. However, as the use time increases, the upper end of the swing arm 220 is prone to wear. Therefore, in an improved embodiment of the present application, a driving part 221 is provided on the end of the swing arm 220 close to the limit block 110, and the outward end of the driving part 221 gradually tilts toward the side of the hopper 400 away from the swing arm 220. An abutment wheel 222 is rotatably provided on the end of the driving part 221, and the outer periphery of the abutment wheel 222 can abut against the limit block 110. The design of the abutment wheel 222 can reduce the friction between the limit block 110 and the driving part 221.

[0044] See also Figure 1 In one embodiment, in order to realize the above-mentioned lifting and lowering functions and adapt to the complex environment in which it is used, a chain drive is preferably used in this application. Wherein, the lifting device 300 includes a lifting motor 310, a chain 320 and a sprocket 330, wherein two sprockets 330 are provided and are rotatably arranged at the top and bottom of the frame 100 through a drive shaft 340, respectively, and the chain 320 is wound around the two sprockets 330, the lifting motor 310 is installed at the bottom of the frame 100 and the output end is connected to the drive shaft 340 at the bottom, and the lifting frame 210 is connected to the chain 320. The above-mentioned structures are all common structures, and the applicant will not elaborate on them here. In order to improve the driving capacity, two chains 320 are provided, which are respectively located on both sides of the frame 100. Similarly, two more sprockets 330 are configured and are both installed on the corresponding drive shafts 340, so that the lifting motor 310 can drive two chains 320 at the same time.

[0045] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A material feeding device, characterized in that: include A frame, with a limit block set on the top; The sliding device comprises a lifting frame, a swing arm and a pulling rod, wherein the middle portion of the swing arm is hinged to the lifting frame, and one end of the swing arm is slidingly hinged to one end of the pulling rod; A lifting device is arranged on the frame; the output end of the lifting device is connected to the lifting frame; the lifting device can drive the lifting frame to rise and fall relative to the frame; A hopper, both sides of which are hinged on the lifting frame, a discharge port is provided at the bottom of the hopper, a gate mechanism is hinged on the discharge port, and the gate mechanism can automatically block the discharge port; Among them, the other end of the pulling rod is hinged on the outer wall of one end of the hopper close to the discharge port, and the middle part of the pulling rod is hinged to the input end of the gate mechanism; when the lifting frame gradually approaches the limit block, the other end of the swing arm first contacts the limit block and produces relative displacement, and the other end of the swing arm can gradually pull the bottom of the hopper to swing outward through the pulling rod and delay driving the gate mechanism to gradually open the discharge port.

2. A material feeding device according to claim 1, characterized in that: The gate mechanism includes a sealing plate and a driving arm, one side of the sealing plate is hinged on the side of the discharge port close to the swing arm, the hopper is provided with a reset mechanism, the reset mechanism can drive the sealing plate to block the discharge port, a push arm is provided on the side where the sealing plate is hinged to the discharge port, one end of the driving arm is hinged to the push arm, and a limiting groove is provided on the other end of the driving arm, and the middle part of the pulling rod is slidably hinged in the limiting groove.

3. A material feeding device according to claim 2, characterized in that: The reset mechanism is a reset torsion spring. The sealing plate and the discharge port are hinged via a rotating shaft. The reset torsion spring is sleeved on the rotating shaft. Two ends of the reset torsion spring are respectively in contact with the sealing plate and the outer wall of the hopper.

4. A material feeding device according to claim 2, characterized in that: The hopper is provided with a locking block that cooperates with the movable side of the sealing plate, and a limiting step is provided on the side of the locking block close to the discharge port. The outward end of the locking block can be deformed, and the outward end of the locking block is located on the side of the limiting step and is provided with a slope. When the movable side of the sealing plate can be stuck on the limiting step, the sealing plate blocks the discharge port.

5. A material feeding device according to claim 4, characterized in that: A supporting wheel is rotatably provided on the end of the locking block, and a supporting wheel capable of rotation is also provided on the back of the sealing plate.

6. A material feeding device according to any one of claims 1 to 5, characterized in that: The lifting frame is provided with a limiting mechanism, and the outer wall of the hopper is provided with a limiting groove matched with the limiting mechanism. When the lifting frame drives the limiting mechanism to abut against the limiting block, the limiting mechanism can be pulled out from the limiting groove.

7. A material feeding device according to claim 6, characterized in that: The limit mechanism comprises a sliding rod, a wedge block, a limit pin and a return spring, the sliding rod being movably inserted in the limit cylinder at the top of the lifting frame, the wedge block being arranged at the lower end of the sliding rod, and an avoidance groove being arranged on the wedge block along the length direction of the sliding rod, the limit pin movably passes through the limit cylinder and one end can be inserted into the limit groove, and the other end of the limit pin also movably passes through the limit cylinder, and an end portion is arranged on the limit pin; the return spring is sleeved on the limit pin, and the two ends are respectively abutted with the end portion and the side of the limit cylinder away from the hopper; the upper end of the sliding rod is higher than the upper end of the swing arm; when the lifting frame drives the sliding rod to abut against the limit block, the end portion can cooperate with the wedge-shaped surface of the wedge block to pull the limit pin out of the limit groove.

8. The material feeding device according to claim 1, characterized in that: Tracks are arranged on both sides of the frame, and both sides of the lifting frame are rollingly installed in the tracks through two groups of rollers.

9. The material feeding device according to claim 1, characterized in that: A driving part is provided on one end of the swing arm close to the limit block, and the outward end of the driving part gradually tilts toward the side of the hopper away from the swing arm. An abutment wheel is rotatably provided on the end of the driving part, and the outer periphery of the abutment wheel can abut against the limit block.

10. The material feeding device according to claim 1, characterized in that: The lifting device includes a lifting motor, a chain and a sprocket. Two sprockets are provided and are rotatably arranged at the top and bottom of the frame respectively through drive shafts. The chain is wound around the two sprockets. The lifting motor is installed on the bottom of the frame and the output end is connected to the drive shaft at the bottom. The lifting frame is connected to the chain.

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