Induction quenching device for quenching peripheries of pin bush parts

Abstract

The invention discloses an induction quenching device for quenching the periphery of a pin bush part, which relates to the technical field of induction quenching and comprises a feeding device and a discharging device for conveying the pin bush part, a roller mechanism and a peripheral induction quenching mechanism, the rolling wheel mechanism is used for driving the pin bush type parts to rotate and transferring the pin bush type parts from the feeding device to the discharging device. And the periphery induction quenching device is used for heating and quenching the peripheries of the pin bush parts on the roller mechanism. Automatic production is achieved, and the labor cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of induction quenching, in particular to an induction quenching device used for quenching the periphery of pin sleeve parts. Background Art

[0002] The pin sleeve is a mechanical part, usually sleeved on the pin shaft, used to reduce the friction and wear between the pin shaft and other parts. The main functions of the pin sleeve are positioning, shock absorption and buffering. It is often used in high and medium speed shaft transmission with more positive and reverse changes and frequent starting. It puts forward high requirements for the surface hardness and wear resistance of the parts, and puts forward certain requirements for the toughness of the parts. In order to improve the surface hardness and wear resistance of the pin sleeve, the outer periphery of the pin sleeve is quenched. In the prior art, the workpiece is often carburized and quenched. After the workpiece is cleaned, the workpiece is loaded into the furnace and heated to 900-950 degrees Celsius. The workpiece is kept warm for a sufficient time to allow the active carbon atoms decomposed in the carburizing medium to penetrate into the surface of the steel part, and then the workpiece is immersed in the coolant for quenching to make the performance of the workpiece better and more stable. However, carburizing and quenching have the following disadvantages: a large amount of energy is consumed during the carburizing and quenching process, and pollutants such as waste gas and wastewater are generated, which have a certain impact on the environment. The process of carburizing and quenching is relatively complicated and requires manual operation, which is not convenient for automated production. The salt bath quenching process will generate high temperature, waste gas, etc., and the working environment is poor, which has a certain impact on the health of workers. Summary of the invention

[0003] In view of the defects existing in the prior art, the purpose of the present invention is to provide an induction hardening device for quenching the periphery of pin sleeve parts, thereby realizing automated production and reducing labor costs.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is: an induction quenching device for peripheral quenching of pin sleeve parts, including a loading device and a unloading device for conveying pin sleeve parts, and also including a roller mechanism and a peripheral induction quenching mechanism; the roller mechanism is used to drive the pin sleeve parts to rotate and transfer the pin sleeve parts from the loading device to the unloading device; the peripheral induction quenching device is used to heat and quench the periphery of the pin sleeve parts on the roller mechanism.

[0005] Based on the above technical solution, the roller mechanism includes a base, on which two hollow rollers are arranged in parallel, and both rollers are inclined downward from the feed end to the discharge end, and a channel for pin sleeve parts to pass through is formed between the two rollers.

[0006] Based on the above technical solution, a first support is provided at the discharge end of the base, and a second support is provided at the feed end of the base. A cleaning mechanism is provided on the first support, and the cleaning mechanism includes a plurality of water spray plates. A rotating motor for driving the drum to rotate is provided on the second support.

[0007] On the basis of the above technical solution, the inclination angle of one roller is greater than the inclination angle of the other roller, and a groove adapted to the peripheral induction quenching device is provided on the roller.

[0008] On the basis of the above technical solution, a material pressing mechanism is arranged on the first support, and the material pressing mechanism includes a screw rod and a lifting cylinder; the upper end of the screw rod is connected to the first hand wheel, and the lower end of the screw rod passes through the first support and is connected to the pressure plate; the driving end of the lifting cylinder passes through the first support and is connected to the pressure wheel through the connecting seat.

[0009] On the basis of the above technical scheme, the peripheral induction quenching mechanism includes a two-dimensional adjustment mechanism and a quenching sensor; the two-dimensional adjustment mechanism includes a fixed plate, a transverse slide, a longitudinal slide, a transverse motor and a longitudinal motor; the transverse slide is slidably connected to the fixed plate through a transverse slide rail; the longitudinal slide is slidably connected to the transverse slide through a longitudinal slide rail; the transverse motor is used to drive the transverse slide to move; the longitudinal motor is used to drive the longitudinal slide to move; the quenching sensor is arranged on the longitudinal slide, and a connecting arm is horizontally arranged on the side of the quenching sensor, and an induction coil is arranged at the free end of the connecting arm.

[0010] Based on the above technical solution, the feeding device includes a feeding conveyor chain, which is provided with an incoming material detection plate and a first baffle in sequence along the conveying direction, and the first baffle is connected to the first push cylinder, and a height adjustment rod and a second hand wheel are provided at the bottom of the feeding conveyor chain.

[0011] On the basis of the above technical solution, the feeding device also includes an automatic feeding box arranged at the feeding end of the feeding conveyor chain, the discharge end of the automatic feeding box extends upward to form a discharge port, and a first guide plate is arranged on the outer side of the discharge port; the inner bottom wall of the automatic feeding box is an inclined surface and a lifting seat is arranged at the lowest point of the inclined surface at the discharge end, and a second baffle is arranged above the lifting seat; a movable partition is axially arranged inside the automatic feeding box, and the outer side wall of the automatic feeding box is provided with a second push cylinder for driving the movable partition to translate and a rotating cylinder for driving the second baffle to flip, and the bottom of the automatic feeding box is provided with a first lifting cylinder for driving the lifting seat to rise and fall.

[0012] On the basis of the above technical solution, the unloading device includes a unloading conveying chain, and the unloading conveying chain is sequentially provided with a second material guide plate, a third material guide plate and a fourth material guide plate along the conveying direction, and the second material guide plate, the third material guide plate and the fourth material guide plate are respectively provided with a third push cylinder, a fourth push cylinder and a fifth push cylinder on the opposite sides thereof.

[0013] On the basis of the above technical solution, the unloading device also includes a return conveyor chain, the feed end of the return conveyor chain is opposite to the second material guide plate, and the discharge end of the return conveyor chain is opposite to the feed end of the roller mechanism; the discharge end of the return conveyor chain is provided with a fifth material guide plate, and a sixth push cylinder is provided on the opposite side of the fifth material guide plate, and a second lifting cylinder is provided at the bottom of the fifth material guide plate.

[0014] The beneficial effects of the present invention are:

[0015] 1. The present invention only heats the periphery of the workpiece, without heating the whole workpiece, which consumes less energy than traditional carburizing and quenching, and the quenching liquid used is mostly pure water, and the waste liquid and waste gas generated have little environmental pollution;

[0016] 2. After the overall operation of the present invention, only the loading box may be manually discharged, and no manual participation is required in the whole process, so that automatic production is realized and labor costs are reduced;

[0017] 3. The present invention adopts induction quenching, which has high quenching efficiency, drives the workpiece production cycle to be fast, and improves the workpiece processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of an induction hardening device for quenching the outer periphery of a pin sleeve-like part in an embodiment of the present invention;

[0019] Figure 2 It is a top view of an induction hardening device used for quenching the outer periphery of a pin sleeve-like part in an embodiment of the present invention;

[0020] Figure 3 A three-dimensional diagram of a roller mechanism in an embodiment of the present invention;

[0021] Figure 4 It is a front view of the roller mechanism in the embodiment of the present invention;

[0022] Figure 5 is a top view of the roller mechanism in an embodiment of the present invention;

[0023] Figure 6 A three-dimensional diagram of a peripheral induction hardening mechanism in an embodiment of the present invention;

[0024] Figure 7 It is a front view of the peripheral induction quenching mechanism in an embodiment of the present invention;

[0025] Figure 8 A side view of the peripheral induction quenching mechanism in an embodiment of the present invention;

[0026] Fig. 9 It is a three-dimensional diagram of a feeding conveyor chain in an embodiment of the present invention;

[0027] Fig.10A three-dimensional diagram of an automatic loading box in an embodiment of the present invention;

[0028] Fig.11 A top view of the automatic loading box in an embodiment of the present invention;

[0029] Fig.12 It is a three-dimensional diagram of the unloading conveyor chain in the embodiment of the present invention;

[0030] Fig.13 It is a three-dimensional diagram of the return conveying chain in the embodiment of the present invention.

[0031] Reference numerals:

[0032] 1-roller mechanism; 11-base; 111-first support; 112-second support; 12-roller; 121-rotating motor; 122-groove; 13-cleaning mechanism; 131-water spray plate; 14-pressing mechanism; 141-pressing plate; 142-screw rod; 143-first hand wheel; 144-connecting seat; 145-pressing wheel; 146-lifting cylinder;

[0033] 2-peripheral induction hardening mechanism; 21-quenching sensor; 211-connecting arm; 212-induction coil; 22-two-dimensional adjustment mechanism; 221-fixed plate; 222-transverse slide; 223-longitudinal slide; 224-transverse motor; 225-longitudinal motor;

[0034] 3-feeding device; 31-feeding conveyor chain; 311-incoming material detection plate; 312-first horizontal push cylinder; 313-first baffle; 314-height adjustment rod; 315-second hand wheel; 32-automatic feeding box; 321-first guide plate; 322-movable partition; 323-second horizontal push cylinder; 324-lifting seat; 325-first lifting cylinder; 326-second baffle; 327-rotating cylinder;

[0035] 4- unloading device; 41- unloading conveying chain; 411- second material guide plate; 412- third material guide plate; 413- fourth material guide plate; 414- third horizontal push cylinder; 415- fourth horizontal push cylinder; 416- fifth horizontal push cylinder; 42- return conveying chain; 421- fifth material guide plate; 422- second lifting cylinder; 423- sixth horizontal push cylinder. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0037] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, "several" and "a number" mean two or more, unless otherwise clearly and specifically defined.

[0039] The following is a further description of the specific embodiments of the present invention in conjunction with the drawings of the specification, so that the technical solution and its beneficial effects of the present invention are clearer and more explicit. The following description of the embodiments with reference to the drawings is exemplary and intended to explain the present invention, but cannot be understood as limiting the present invention.

[0040] See also Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an induction quenching device for peripheral quenching of pin sleeve parts, including a loading device 3 and a unloading device 4 for conveying pin sleeve parts, and also includes a roller mechanism 1 and a peripheral induction quenching mechanism 2; the roller mechanism 1 is used to drive the pin sleeve parts to rotate and transfer the pin sleeve parts from the loading device 3 to the unloading device 4; the peripheral induction quenching device is used to heat and quench the periphery of the pin sleeve parts on the roller mechanism 1.

[0041] See also Figure 3 to Figure 5As shown, the roller mechanism 1 includes a base 11, on which two hollow rollers 12 are arranged in parallel, and both rollers 12 are inclined downward from the feed end to the discharge end, and a channel for the pin sleeve parts to pass through is formed between the two rollers 12. Specifically, a first support 111 is arranged at the discharge end of the base 11, and a second support 112 is arranged at the feed end of the base 11. A cleaning mechanism 13 is arranged on the first support 111, and the cleaning mechanism 13 includes a plurality of water spray plates 131. A rotating motor 121 for driving the rollers 12 to rotate is arranged on the second support 112. The inclination angle of one roller 12 is greater than the inclination angle of the other roller 12, and a groove 122 adapted to the peripheral induction quenching device is opened on the roller 12. The first support 111 is provided with a pressing mechanism 14, which includes a screw rod 142 and a lifting cylinder 146; the upper end of the screw rod 142 is connected to the first hand wheel 143, and the lower end of the screw rod 142 passes through the first support 111 and is connected to the pressing plate 141; the driving end of the lifting cylinder 146 passes through the first support 111 and is connected to the pressing wheel 145 through the connecting seat 144. The cleaning mechanism and the pressing mechanism jointly complete the cooling and cleaning of the workpiece.

[0042] See also Figure 6 to Figure 8 As shown, the peripheral induction quenching mechanism 2 includes a two-dimensional adjustment mechanism 22 and a quenching sensor 21; the two-dimensional adjustment mechanism 22 includes a fixed plate 221, a transverse slide 222, a longitudinal slide 223, a transverse motor 224 and a longitudinal motor 225; the transverse slide 222 is slidably connected to the fixed plate 221 through a transverse slide rail; the longitudinal slide 223 is slidably connected to the transverse slide 222 through a longitudinal slide rail; the transverse motor 224 is used to drive the transverse slide 222 to move; the longitudinal motor 225 is used to drive the longitudinal slide 223 to move; the quenching sensor 21 is arranged on the longitudinal slide 223, and a connecting arm 211 is horizontally arranged on the side of the quenching sensor 21, and an induction coil 212 is arranged at the free end of the connecting arm 211.

[0043] See also Fig. 9 As shown, the feeding device 3 includes a feeding conveyor chain 31, and the feeding conveyor chain 31 is provided with an incoming material detection plate 311 and a first baffle 313 in sequence along the conveying direction, and the first baffle 313 is connected to the first horizontal push cylinder 312, and a height adjustment rod 314 and a second hand wheel 315 are provided at the bottom of the feeding conveyor chain 31. The height of the unloading end of the feeding conveyor chain can be adjusted according to the size of the workpiece, so that the workpiece can smoothly transition between the feeding conveyor chain and the roller component, and a feeding stopper device is included to avoid the accumulation of workpieces, and an incoming material detection device is provided to detect whether there is incoming material, and a process feeding port is opened.

[0044] See also Figure 10-11As shown, the loading device 3 also includes an automatic loading box 32 arranged at the feeding end of the loading conveyor chain 31, the discharge end of the automatic loading box 32 extends upward to form a discharge port, and a first guide plate 321 is arranged on the outer side of the discharge port; the inner bottom wall of the automatic loading box 32 is an inclined surface and the inclined surface is located at the lowest point of the discharge end, and a lifting seat 324 is arranged, and a second baffle 326 is arranged above the lifting seat 324; a movable partition 322 is axially arranged inside the automatic loading box 32, and the outer side wall of the automatic loading box 32 is provided with a second push cylinder 323 for driving the movable partition 322 to translate and a rotating cylinder 327 for driving the second baffle 326 to flip, and the bottom of the automatic loading box 32 is provided with a first lifting cylinder 325 for driving the lifting seat 324 to rise and fall. The loading box can realize material storage and automatic loading. Automatic loading is achieved through the cylinder multi-stage lifting device and the workpiece's own weight. It also contains a material blocking device to avoid workpiece accumulation, and the storage space size can be adjusted according to the size of the workpiece.

[0045] See also Fig.12 As shown, the unloading device 4 includes an unloading conveying chain 41, and the unloading conveying chain 41 is sequentially provided with a second guide plate 411, a third guide plate 412 and a fourth guide plate 413 along the conveying direction, and the opposite sides of the second guide plate 411, the third guide plate 412 and the fourth guide plate 413 are respectively provided with a third push cylinder 414, a fourth push cylinder 415 and a fifth push cylinder 416. The unloading conveying chain has a process unloading port, a defective product unloading port and a workpiece unloading port in sequence, and the three unloading ports are respectively equipped with a process pushing component, a defective product pushing component and a workpiece unloading pushing component, and the process unloading port and the defective product unloading port correspond to the process conveying chain and the defective product receiving tray respectively, and the workpiece unloading port corresponds to the workpiece subsequent process equipment.

[0046] See also Fig.13 As shown, the unloading device 4 also includes a return conveying chain 42, the feed end of the return conveying chain 42 is opposite to the second guide plate 411, and the discharge end of the return conveying chain 42 is opposite to the feed end of the roller mechanism 1; the discharge end of the return conveying chain 42 is provided with a fifth guide plate 421, the opposite side of the fifth guide plate 421 is provided with a sixth push cylinder 423, and the bottom of the fifth guide plate 421 is provided with a second lifting cylinder 422.

[0047] The present invention has a process debugging stage before formal operation, and the operation process is as follows:

[0048] The loading box adjusts the storage space size according to the size of the workpiece so that the workpieces are stacked neatly. The workpieces are stacked horizontally in the loading box, and roll down to the multi-stage loading device through the inclined slide plate and self-weight in the box, and reach the loading end of the loading conveyor chain through the loading box blocking mechanism. The loading conveyor chain adjusts the height of the unloading end of the loading conveyor chain in advance according to the size of the workpiece so that the workpiece can smoothly reach the peripheral induction hardening component. After reaching the peripheral induction hardening component, the roller component drives the workpiece to rotate while driving the workpiece to move forward. After the peripheral load induction hardening component is heated to a certain temperature, Continue forward to the water spray cooling device to quench and cool the workpiece (the quenching and cooling processes of the workpiece are completed on the roller component). After the workpiece is cooled, it reaches the unloading conveyor chain, enters the process conveyor chain through the process pushing component, and returns to the loading conveyor chain through the process parts loading device of the process conveyor chain. Repeat the previous process until the process debugging is qualified. When the workpiece passes the unloading conveyor chain, it is no longer pushed into the process conveyor chain by the process pushing component, but pushed into the defective product receiving tray by the defective product pushing component. The debugging part before formal operation is completed.

[0049] The pre-operation inspection mainly checks whether all components are running well and working properly. It can also adjust the quenching process parameters, conveyor chain operation rhythm, etc. After formal operation, only the equipment parameters need to be fine-tuned according to the actual situation.

[0050] The present invention is formally put into operation, and its operation process is as follows:

[0051] The workpiece is transported from the loading box to the loading conveyor chain, which drives the workpiece to the loading end of the roller component. The roller component drives the workpiece to rotate and move forward. The workpiece passes through the peripheral load induction quenching component and the water spray cooling device on the roller component in turn to complete peripheral quenching and cleaning. After passing the unloading end of the roller component, the workpiece falls into the unloading conveyor chain. After reaching the workpiece unloading port through the unloading conveyor chain, it enters the subsequent process or completes quenching.

[0052] In the description of the specification, the description with reference to the terms "one embodiment", "preferably", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention, and the schematic expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0053] The present invention is not limited to the above-mentioned embodiments. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. An induction hardening device for hardening the outer periphery of a pin sleeve part, comprising a loading device (3) and a unloading device (4) for conveying the pin sleeve part, characterized in that: It also includes a roller mechanism (1) and a peripheral induction quenching mechanism (2); The roller mechanism (1) is used to drive the pin sleeve parts to rotate and transfer the pin sleeve parts from the loading device (3) to the unloading device (4); The peripheral induction quenching device is used to heat and quench the periphery of pin sleeve parts on the roller mechanism (1).

2. The induction hardening device for quenching the outer periphery of pin sleeve parts according to claim 1, characterized in that: The roller mechanism (1) comprises a base (11), on which two hollow rollers (12) are arranged in parallel, and both rollers (12) are inclined downward from the feeding end to the discharging end, and a channel for pin sleeve parts to pass through is formed between the two rollers (12).

3. The induction hardening device for quenching the outer periphery of pin sleeve parts according to claim 2, characterized in that: A first support (111) is provided at the discharge end of the base (11), a second support (112) is provided at the feed end of the base (11), a cleaning mechanism (13) is provided on the first support (111), the cleaning mechanism (13) comprises a plurality of water spray plates (131), and a rotating motor (121) for driving the roller (12) to rotate is provided on the second support (112).

4. The induction hardening device for quenching the outer periphery of pin sleeve parts according to claim 2, characterized in that: The inclination angle of one roller (12) is greater than the inclination angle of the other roller (12), and a groove (122) adapted to a peripheral induction quenching device is provided on the roller (12).

5. The induction hardening device for quenching the outer periphery of pin sleeve parts according to claim 3, characterized in that: A material pressing mechanism (14) is arranged on the first support (111), and the material pressing mechanism (14) comprises a screw rod (142) and a lifting cylinder (146); the upper end of the screw rod (142) is connected to the first hand wheel (143), and the lower end of the screw rod (142) passes through the first support (111) and is connected to the pressing plate (141); the driving end of the lifting cylinder (146) passes through the first support (111) and is connected to the pressing wheel (145) through a connecting seat (144).

6. The induction hardening device for quenching the outer periphery of pin sleeve parts according to claim 1, characterized in that: The peripheral induction quenching mechanism (2) comprises a two-dimensional adjustment mechanism (22) and a quenching sensor (21); the two-dimensional adjustment mechanism (22) comprises a fixed plate (221), a transverse slide plate (222), a longitudinal slide plate (223), a transverse motor (224) and a longitudinal motor (225); the transverse slide plate (222) is slidably connected to the fixed plate (221) via a transverse slide rail; the longitudinal slide plate (223) is slidably connected to the transverse slide plate (222) via a longitudinal slide rail; the transverse motor (224) is used to drive the transverse slide plate (222) to move; the longitudinal motor (225) is used to drive the longitudinal slide plate (223) to move; the quenching sensor (21) is arranged on the longitudinal slide plate (223), a connecting arm (211) is horizontally arranged on the side of the quenching sensor (21), and an induction coil (212) is arranged at the free end of the connecting arm (211).

7. The induction hardening device for quenching the outer periphery of pin sleeve parts according to claim 1, characterized in that: The feeding device (3) comprises a feeding conveying chain (31), wherein the feeding conveying chain (31) is provided with a material incoming detection plate (311) and a first baffle (313) in sequence along a conveying direction, and the first baffle (313) is connected to a first push cylinder (312), and a height adjustment rod (314) and a second hand wheel (315) are provided at the bottom of the feeding conveying chain (31).

8. The induction hardening device for quenching the outer periphery of pin sleeve parts according to claim 7, characterized in that: The feeding device (3) also includes an automatic feeding box (32) arranged at the feeding end of the feeding conveyor chain (31), the discharge end of the automatic feeding box (32) extends upward to form a discharge port, and a first guide plate (321) is arranged on the outer side of the discharge port; the inner bottom wall of the automatic feeding box (32) is an inclined surface, and a lifting seat (324) is arranged at the lowest point of the inclined surface at the discharge end, and a second baffle (326) is arranged above the lifting seat (324); a movable partition (322) is axially arranged inside the automatic feeding box (32), and the outer side wall of the automatic feeding box (32) is provided with a second push cylinder (323) for driving the movable partition (322) to translate and a rotating cylinder (327) for driving the second baffle (326) to flip, and the bottom of the automatic feeding box (32) is provided with a first lifting cylinder (325) for driving the lifting seat (324) to rise and fall.

9. The induction hardening device for quenching the outer periphery of pin sleeve parts according to claim 1, characterized in that: The unloading device (4) comprises an unloading conveying chain (41), wherein the unloading conveying chain (41) is provided with a second material guide plate (411), a third material guide plate (412) and a fourth material guide plate (413) in sequence along the conveying direction, and a third push cylinder (414), a fourth push cylinder (415) and a fifth push cylinder (416) are respectively provided on opposite sides of the second material guide plate (411), the third material guide plate (412) and the fourth material guide plate (413).

10. The induction hardening device for quenching the outer periphery of pin sleeve parts according to claim 9, characterized in that: The unloading device (4) also includes a return conveying chain (42), the feed end of the return conveying chain (42) is opposite to the second guide plate (411), and the discharge end of the return conveying chain (42) is opposite to the feed end of the roller mechanism (1); the discharge end of the return conveying chain (42) is provided with a fifth guide plate (421), the opposite side of the fifth guide plate (421) is provided with a sixth push cylinder (423), and the bottom of the fifth guide plate (421) is provided with a second lifting cylinder (422).

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