A headless bolt thread rolling and mis-dividing prevention device

Abstract

The invention discloses a headless bolt thread rolling error-proof material distribution device, comprising a distribution mechanism, a distribution pipe and a lower feed pipe. The distribution mechanism comprises a distribution plate and a sensing device, and a distribution port with an adjustable opening size is provided on the distribution plate. The sensing device is arranged below the distribution plate to detect the protruding end of the headless bolt and is connected to the distribution plate to control the opening and closing of the distribution plate. The lower feed pipe comprises a first material receiving pipe arranged in a vertical direction and a second material receiving pipe extending obliquely upward along the side where the distribution pipe is located, and the upper end of the first material receiving pipe is close to the lower end of the outer end of the distribution plate. The distribution pipe is arranged below the distribution port of the distribution plate in a vertical direction and rotatably. When the headless bolt enters the distribution pipe, the distribution pipe rotates to the side where the lower feed pipe is located and corresponds coaxially with the second material receiving pipe. The opening width of the distribution port is controlled by whether the sensing device detects the protruding end of the headless bolt, so that the headless bolt enters from the first receiving pipe or the second receiving pipe to keep the headless bolt in the same direction.

Description

Technical Field

[0001] The invention relates to the technical field of thread rolling machines, and in particular to a headless bolt thread rolling and mis-distribution prevention device. Background Art

[0002] like Figure 1 The structural diagram of the headless bolt 1 shown in the figure includes a protruding end 10 and a main body 11. The diameter of the protruding end 10 is smaller than that of the main body 11. During production, the blank of the headless bolt needs to be placed on a thread rolling machine to perform thread rolling on the main body. The traditional method is to manually place the headless bolts one by one on the thread rolling machine for processing, which is very inefficient. With the development of automation technology, various types of automation equipment are currently used for feeding or adding materials, such as using a vibration plate, so as to improve processing efficiency. However, if only a vibration plate is used for feeding, it cannot be guaranteed that the headless bolt will maintain the correct orientation when entering the thread rolling machine processing position. For example, for Figure 1 The headless bolt shown in the figure needs to ensure that the protruding end faces upward when entering the thread rolling machine to ensure that the processed product meets the technical requirements. If the material is only fed through the vibrating plate, the protruding end may face upward or downward when entering the thread rolling machine, so the product quality cannot be guaranteed and the product scrap rate is very high. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a headless bolt thread rolling and mis-dividing prevention device.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention discloses a headless bolt thread rolling error-proof material distribution device, comprising a material distribution mechanism, a material distribution pipe and a lower feeding pipe; the material distribution mechanism comprises a material distribution plate and a sensing device, a material distribution port with an adjustable opening size is provided on the material distribution plate, and the initial opening width of the material distribution port is between the diameter of the protruding end of the headless bolt and the diameter of the headless bolt body; the sensing device is arranged below the material distribution plate for detecting the protruding end of the headless bolt and is connected to the material distribution plate to control the opening and closing of the material distribution plate; the lower feeding pipe comprises a first material receiving pipe arranged in a vertical direction and a first material receiving pipe arranged along one side of the material distribution pipe A second material receiving pipe extends obliquely upward, and the upper end of the first material receiving pipe is close to the lower end of the outer end of the material dividing plate; the material dividing pipe is rotatably arranged below the material dividing port of the material dividing plate in the vertical direction. When the headless bolt enters the material dividing pipe, the material dividing pipe rotates to the side where the downward feeding pipe is located and becomes coaxial with the second material receiving pipe; when working, the material dividing plate maintains its initial state, and the opening width of the material dividing port is controlled by whether the sensing device detects the protruding end of the headless bolt, so that the headless bolt enters from the first material receiving pipe or the second material receiving pipe to keep the direction of the headless bolt consistent.

[0006] Furthermore, when the sensing device does not detect the protruding end of the headless bolt, the opening width of the dividing plate remains unchanged, and the headless bolt enters the first material receiving pipe; when the sensing device detects the protruding end of the headless bolt, the sensing device controls the dividing plate to expand the opening width, and the headless bolt enters the dividing pipe. After the dividing pipe rotates toward the side where the downward feeding pipe is located, it becomes coaxial with the second material receiving pipe and feeds the headless bolt into the second material receiving pipe.

[0007] Furthermore, it also includes a clamp box; the material dividing plate includes a first clamp plate and a second clamp plate, and a material dividing port is formed between the first clamp plate and the second clamp plate; one end of the first clamp plate is fixed on the clamp box, and one end of the second clamp plate is hinged to the first transmission rod; the other ends of the first clamp plate and the second clamp plate extend close to the upper end of the first material receiving pipe.

[0008] Furthermore, the sensing device includes an electrically connected sensor, a relay and an electromagnet; the sensor is arranged below the dividing plate to detect the protruding end of the headless bolt; the electromagnet is connected to the second transmission rod, and the second transmission rod is hinged to the first transmission rod; when the sensor detects the protruding end of the headless bolt, it feeds back to the relay, and the relay controls the attraction of the electromagnet, thereby driving the second clamp plate away from or close to the first clamp plate by pulling the first transmission rod and the second transmission rod to adjust the opening width of the dividing port.

[0009] Furthermore, the sensor is a proximity switch.

[0010] Furthermore, it also includes a bracket, an upper feed pipe, and a feeding wheel. The feeding wheel is rotatably arranged on the bracket, and the upper feed pipe is arranged above the feeding wheel.

[0011] Furthermore, at least one receiving hole is radially provided on the circumference of the feeding wheel; the axis of the discharge hole of the upper feeding pipe is arranged in the vertical direction and is consistent with the radial direction of the feeding wheel, so that the discharge hole of the upper feeding pipe corresponds to the receiving hole.

[0012] Furthermore, an arc baffle is provided on the clamp box near the bottom of the feeding wheel to prevent the headless bolt from falling.

[0013] Furthermore, the dividing plate is arranged directly below the feeding wheel, and the distance between the lower surface of the dividing plate and the bottom of the feeding wheel is less than the main body length of the headless bolt.

[0014] Furthermore, the material distribution pipe is a tubular structure with an open upper end and a closed lower end. The material distribution pipe includes a hollow pipe section and a solid pipe section. The connection between the hollow pipe section and the solid pipe section is rotatably arranged on the bracket through a connecting rod; a limit rod is provided on the bracket between the material distribution pipe and the second material receiving pipe, so that the material distribution pipe can rotate toward the side where the downward feeding pipe is located and correspond coaxially with the second material receiving pipe.

[0015] The beneficial effects of the present invention are as follows: the headless bolt thread rolling anti-wrong material distribution device of the present invention, through the ingenious design of the material distribution mechanism, the material distribution pipe and the lower feeding pipe, can ensure that the protruding end of the headless bolt incoming material is facing upward or downward when entering the thread rolling machine, thereby ensuring that the processed product meets the technical requirements, greatly reducing the product scrap rate and saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0017] Figure 1 This is the structural diagram of the headless bolt;

[0018] Figure 2 It is a structural schematic diagram of a headless bolt thread rolling and mis-distribution prevention device of the present invention;

[0019] Figure 3 for Figure 2 A partial enlarged view of the

[0020] In the figure, 1 is a headless bolt, 10 is a protruding end, 11 is a main body, 2 is a material dividing mechanism, 3 is a material dividing pipe, 4 is a lower feeding pipe, 20 is a material dividing plate, 200 is a material dividing port, 40 is a first material receiving pipe, 41 is a second material receiving pipe, 5 is a clamp box, 201 is a first clamp plate, 202 is a second clamp plate, 12 is a sensor, 13 is an electromagnet, 203 is a first transmission rod, 204 is a second transmission rod, 6 is a bracket, 7 is an upper feeding pipe, 8 is a feeding wheel, 80 is a material receiving hole, 51 is an arc baffle, 30 is a hollow pipe section, 31 is a solid pipe section, and 9 is a limit rod. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0022] like Figure 2 and Figure 3 As shown, a headless bolt thread rolling and anti-wrong material distribution device of the present invention comprises a material distribution mechanism 2, a material distribution pipe 3 and a lower feeding pipe 4.

[0023] The dividing mechanism 2 includes a dividing plate 20 and a sensing device. A dividing port 200 with an adjustable opening size is provided on the dividing plate 20. The initial opening width of the dividing port 200 is between the diameter of the protruding end 10 of the headless bolt and the diameter of the headless bolt body 11. When the headless bolt enters the dividing plate 20 with the protruding end facing downward, the protruding end will pass through the dividing port 200 and the abnormality will be detected by the sensing device, thereby controlling other actuators to act to correct the error.

[0024] The sensing device is arranged below the material dividing plate 20 to detect the protruding end of the headless bolt and is connected to the material dividing plate 20 to control the opening and closing of the material dividing plate 20. The lower feeding pipe 4 includes a first material receiving pipe 40 arranged in the vertical direction and a second material receiving pipe 41 extending obliquely upward along the side where the material dividing pipe 3 is located. The second material receiving pipe 41 is connected with the first material receiving pipe 40. The bottom of the first material receiving pipe 40 is close to the processing position of the thread rolling machine. During actual processing, the headless bolt falls directly from the bottom of the first material receiving pipe 40 into the processing position of the thread rolling machine.

[0025] The upper end of the first material receiving pipe 40 is close to the lower outer end of the dividing plate 20, so that when the headless bolt is oriented correctly, the opening width of the dividing port 200 remains in its initial state, and the headless bolt passes directly over the dividing plate 20 and falls into the first material receiving pipe 40 to enter the processing position of the thread rolling machine for processing.

[0026] The distribution pipe 3 is rotatably arranged below the distribution port 200 of the distribution plate 20 in the vertical direction. When the sensing device detects that the protruding end of the headless bolt is facing downward, the headless bolt enters the distribution pipe 3 through the distribution port 200 in the vertical direction. The distribution pipe 3 rotates to the side where the downward feeding pipe is located and becomes coaxial with the second receiving pipe 41. At this time, the headless bolt enters the second receiving pipe 41 and adjusts the protruding end to face upward, and then enters the thread rolling machine processing position at the bottom of the first receiving pipe 40.

[0027] During operation, the dividing plate 20 maintains its initial state, and controls the opening width of the dividing port 200 by detecting the protruding end of the headless bolt by the sensing device, so that the headless bolt enters from the first receiving pipe 40 or the second receiving pipe 41 to keep the direction of the headless bolt consistent.

[0028] Specifically, when the sensing device does not detect the protruding end of the headless bolt, it means that the protruding end is facing upward at this time, which is the correct orientation. The opening width of the dividing plate 20 remains unchanged, and the headless bolt directly enters the first receiving tube 40. When the sensing device detects the protruding end of the headless bolt, it means that the protruding end is facing downward at this time, which is the wrong orientation. The sensing device controls the dividing plate 20 to expand the opening width so that the width of the opening is greater than the diameter of the headless bolt body so that it can fall naturally. The headless bolt enters the dividing tube 3, and the dividing tube 3 rotates to the side where the feeding tube is located, and then coaxially corresponds to the second receiving tube 41 to feed the headless bolt into the second receiving tube 41. At this time, when entering the bottom of the first receiving tube 40, the protruding end facing downward is changed to the protruding end facing upward, so that when entering the thread rolling machine, the protruding ends of all the headless bolts are guaranteed to face upward, thereby ensuring that the processed products meet the technical requirements and improving the product qualification rate.

[0029] The headless bolt thread rolling and mis-dividing device of the present invention further comprises a clamp box 5. The dividing plate 20 comprises a first clamp plate 201 and a second clamp plate 202, and a dividing opening 200 is formed between the first clamp plate 201 and the second clamp plate 202. One end of the first clamp plate 201 is fixed on the clamp box 5, and one end of the second clamp plate 202 is hinged to the first transmission rod 203. The other ends of the first clamp plate 201 and the second clamp plate 202 extend close to the upper end of the first receiving pipe 40, so that the incoming material can directly enter the first receiving pipe 40 when the direction is correct.

[0030] The sensing device includes an electrically connected sensor 12, a relay and an electromagnet 13. The sensor 12 is arranged below the material distribution plate 20 and close to the upper end of the material distribution pipe 3 for detecting the protruding end of the headless bolt. The electromagnet 13 is connected to the second transmission rod 204, and the second transmission rod 204 is hinged to the first transmission rod 203. When the sensor 12 detects the protruding end of the headless bolt, it is fed back to the relay, and the relay controls the attraction of the electromagnet 13, thereby driving the second clamp plate 202 away from or close to the first clamp plate 201 by pulling the first transmission rod 203 and the second transmission rod 204 to adjust the opening width of the material distribution port 200. Of course, in other embodiments, other structures can also be adopted to achieve the adjustment of the opening width of the material distribution port 200. In this embodiment, the sensor 12 is a proximity switch.

[0031] The headless bolt thread rolling and anti-wrong distribution device of the present invention also includes a bracket 6, an upper feed pipe 7, and a feeding wheel 8. The feeding wheel 8 is rotatably arranged on the bracket 6, and the upper feed pipe 7 is arranged above the feeding wheel 8. The feed port of the upper feed pipe 7 is connected with the discharge port of the vibration plate to facilitate the incoming material. The protruding end of the headless bolt of the incoming material may face upward or downward, which is a random state.

[0032] At least one receiving hole 80 is provided radially on the circumference of the feeding wheel 8 for accommodating a headless bolt, and multiple holes can be provided at the same time according to actual needs. The axis of the discharge hole of the upper feeding pipe 7 is provided in the vertical direction and is consistent with the radial direction of the feeding wheel 8, so that the discharge hole of the upper feeding pipe 7 corresponds to the receiving hole 80, so that the headless bolt can enter the receiving hole 80 after passing through the upper feeding pipe 7.

[0033] An arc baffle 51 is provided on the clamp box 5 near the bottom of the feeding wheel 8 to prevent the headless bolt from falling. During operation, the feeding wheel 8 rotates counterclockwise driven by the motor. The design of the arc baffle 51 can prevent the headless bolt from falling from the receiving hole 80 on the feeding wheel 8.

[0034] The dividing plate 20 is arranged directly below the feeding wheel 8, and the distance between the lower surface of the dividing plate 20 and the bottom of the feeding wheel 8 is less than the main body length of the headless bolt, so as to ensure that the headless bolt will not fall off randomly when the feeding wheel 8 rotates to the bottom, and can ensure that the headless bolt enters the correct position with the rotation of the feeding wheel 8. For example, when the protruding end faces upward, the dividing plate 20 and the feeding wheel 8 jointly limit the headless bolt, and drive the feeding wheel 8 to make it fall directly into the first receiving pipe 40.

[0035] In this embodiment, the material distribution pipe 3 is a tubular structure with an open upper end and a closed lower end. The material distribution pipe 3 includes a hollow pipe section 30 and a solid pipe section 31. The hollow pipe section 30 is used to accommodate the headless bolt, and the solid pipe section 31 is used to automatically reset the material distribution pipe 3. The overall mass of the hollow pipe section 30 can be designed according to actual needs. In principle, the overall mass is not greater than the sum of the masses of the hollow pipe section 30 and the headless bolt. It is designed so that as long as the headless bolt enters the hollow pipe section 30, the material distribution pipe 3 can be rotated as a whole to the side where the feeding pipe is located. Of course, a limiting structure can be designed on the other side of the material distribution pipe 3 to prevent the material distribution pipe 3 from rotating in the opposite direction. The connection between the hollow pipe section 30 and the solid pipe section 31 is rotatably arranged on the bracket 6 through a connecting rod. The solid pipe section 31 and the limiting rod 9 are provided between the material distribution pipe 3 and the second material receiving pipe 41 on the bracket 6, so that the material distribution pipe 3 rotates to the side where the lower feeding pipe is located and corresponds to the second material receiving pipe 41 coaxially, so that the headless bolt can enter the second material receiving pipe 41 from the material distribution pipe 3. Through the design of the above structure, firstly, when in the initial state, under the action of the gravity of the solid pipe section 31, the material distribution pipe 3 can be kept in a vertical state as a whole and the hollow pipe section 30 can face upward to receive the headless bolt dropped from the material distribution plate 20 at any time. When the headless bolt enters the hollow pipe section 30, due to the action of gravity, the material distribution pipe 3 rotates toward the side where the feeding pipe is located, and cooperates with the limit rod 9 to make it coaxial with the second receiving pipe 41, so that the headless bolt enters the second receiving pipe 41 from the material distribution pipe 3, thereby adjusting the original headless bolt with the protruding end facing downward to the required protruding end facing downward, and after the headless bolt goes out of the material distribution pipe 3, the material distribution pipe 3 can be quickly reset under the action of the gravity of the pipe section. The above method can also be replaced by an electric method, but the present invention, through the design of the hollow pipe section 30 and the solid pipe section 31, is not only simple in structure and low in cost, but also uses gravity to rotate and reset naturally, and can respond quickly.

[0036] The working process of the present invention is that the incoming headless bolt enters the upper feed pipe 7 randomly regardless of the direction of the protruding end, and falls into the receiving hole 80 of the feeding wheel 8. The feeding wheel 8 rotates to turn it to the dividing plate 20, and the sensor 12 detects whether the protruding end passes through the dividing port 200. If it is detected that the protruding end passes through the dividing port 200, it means that the protruding end is facing downward and the direction needs to be corrected. At this time, the electromagnet 13 is attracted to increase the opening width on the dividing plate 20, and the headless bolt falls into the dividing pipe 3. The dividing pipe 3 automatically rotates to the second receiving pipe 41 due to gravity. The second receiving pipe 41 enters the second receiving pipe 41 by its own gravity, and the direction correction is completed. The dividing pipe 3 is reset by its own gravity. On the contrary, if the protruding end is not detected to pass through the dividing port 200, it means that the protruding end is facing upward, the dividing plate 20 does not move, and the feeding wheel 8 sends the headless bolt to the top of the first receiving pipe 40 and automatically falls in.

[0037] The headless bolt thread rolling anti-mis-dividing device of the present invention is cleverly designed with a dividing mechanism, a dividing pipe and a lower feeding pipe. No matter the protruding end of the headless bolt is facing upward or downward, it can ensure that the protruding end is facing upward when entering the thread rolling machine, thereby ensuring that the processed product meets the technical requirements, greatly reducing the product scrap rate and saving production costs. Of course, the synchronous linkage of the above-mentioned mechanisms needs to be realized in combination with the automatic control technology. The automatic control technology used for realization is a common means and will not be repeated here.

[0038] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second", etc. appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

Claims

1. A headless bolt thread rolling and mis-distribution prevention device, characterized in that: It includes a material distribution mechanism, a material distribution pipe and a lower feeding pipe; The material distribution mechanism includes a material distribution plate and a sensing device, wherein a material distribution port with an adjustable opening size is provided on the material distribution plate, and the initial opening width of the material distribution port is between the diameter of the protruding end of the headless bolt and the diameter of the headless bolt body; the sensing device is arranged below the material distribution plate to detect the protruding end of the headless bolt and is connected to the material distribution plate to control the opening and closing of the material distribution plate; the lower feeding pipe includes a first material receiving pipe arranged in the vertical direction and a second material receiving pipe extending obliquely upward along one side of the material distribution pipe, the first The upper end of the material receiving pipe is close to the lower outer end of the material dividing plate; the material dividing pipe is rotatably arranged below the material dividing port of the material dividing plate along the vertical direction. When the headless bolt enters the material dividing pipe, the material dividing pipe rotates toward the side where the lower feeding pipe is located and becomes coaxial with the second material receiving pipe. During operation, the material dividing plate maintains its initial state, and the opening width of the material dividing port is controlled by whether the sensing device detects the protruding end of the headless bolt, so that the headless bolt enters from the first material receiving pipe or the second material receiving pipe to keep the direction of the headless bolt consistent.

2. The headless bolt thread rolling and mis-distribution prevention device according to claim 1 is characterized in that: When the sensing device does not detect the protruding end of the headless bolt, the opening width of the dividing plate remains unchanged, and the headless bolt enters the first material receiving pipe; when the sensing device detects the protruding end of the headless bolt, the sensing device controls the dividing plate to expand the opening width, and the headless bolt enters the dividing pipe. After the dividing pipe rotates toward the side where the lower feeding pipe is located, it becomes coaxial with the second material receiving pipe and feeds the headless bolt into the second material receiving pipe.

3. The headless bolt thread rolling and mis-distribution prevention device according to claim 1 is characterized in that: It also includes a clamp box; the material dividing plate includes a first clamp plate and a second clamp plate, and a material dividing port is formed between the first clamp plate and the second clamp plate; one end of the first clamp plate is fixed on the clamp box, and one end of the second clamp plate is hinged to the first transmission rod; the other ends of the first clamp plate and the second clamp plate extend close to the upper end of the first material receiving pipe.

4. The headless bolt thread rolling and mis-distribution prevention device according to claim 3 is characterized in that: The sensing device includes an electrically connected sensor, a relay and an electromagnet; the sensor is arranged below the dividing plate to detect the protruding end of the headless bolt; the electromagnet is connected to the second transmission rod, and the second transmission rod is hinged to the first transmission rod; when the sensor detects the protruding end of the headless bolt, it feeds back to the relay, and the relay controls the attraction of the electromagnet, thereby driving the second clamp plate away from or close to the first clamp plate by pulling the first transmission rod and the second transmission rod to adjust the opening width of the dividing port.

5. The headless bolt thread rolling and mis-distribution prevention device according to claim 4 is characterized in that: The sensor is a proximity switch.

6. The headless bolt thread rolling and mis-distribution prevention device according to claim 5, characterized in that: It also includes a bracket, an upper feed pipe, and a feeding wheel. The feeding wheel is rotatably arranged on the bracket, and the upper feed pipe is arranged above the feeding wheel.

7. The headless bolt thread rolling and mis-distribution prevention device according to claim 6 is characterized in that: At least one receiving hole is radially arranged on the circumference of the feeding wheel; the axis of the discharge hole of the upper feeding pipe is arranged in the vertical direction and is consistent with the radial direction of the feeding wheel, so that the discharge hole of the upper feeding pipe corresponds to the receiving hole.

8. The headless bolt thread rolling and mis-distribution prevention device according to claim 7 is characterized in that: An arc baffle is provided on the clamp box near the bottom of the feeding wheel to prevent the headless bolt from falling.

9. The headless bolt thread rolling and mis-distribution prevention device according to claim 8, characterized in that: The dividing plate is arranged directly below the feeding wheel, and the distance between the lower surface of the dividing plate and the bottom of the feeding wheel is less than the main body length of the headless bolt.

10. The headless bolt thread rolling and mis-distribution prevention device according to claim 9, characterized in that: The material distribution pipe is a tubular structure with an open upper end and a closed lower end. The material distribution pipe includes a hollow pipe section and a solid pipe section. The connection between the hollow pipe section and the solid pipe section is rotatably arranged on the bracket through a connecting rod. A limiting rod is provided on the bracket between the material distribution pipe and the second material receiving pipe so that the material distribution pipe can rotate toward the side where the lower feeding pipe is located and then correspond coaxially with the second material receiving pipe.

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