Heating furnace feeding assembly

Abstract

The utility model relates to the field of metal bar heating equipment, in particular to a heating furnace feeding assembly which comprises a material frame and a material moving device, and the material moving device is used for grabbing bars and throwing the bars to a feeding port of a heating furnace. The material frame comprises a rectangular material bearing plate, a slope surface is formed on the top wall of the material bearing plate, and the angle of the slope surface allows bars placed on the material bearing plate to move from the high position of the slope surface to the low position of the slope surface through the gravity action of the bars. The material frame further comprises a first material blocking plate arranged on the bottom edge of the material bearing plate, and the first material blocking plate is used for blocking the bar on the lowest portion of the slope at the material taking position of the material moving device. According to the embodiment of the utility model, the material rack is used for storing a large number of bars, then the material moving device is used for moving the bars from the material rack to the feeding hole of the heating furnace, and an operator only needs to supplement the bars to the material rack, so that the working position of the operator is far away from the feeding hole of the heating furnace, and the potential safety hazard is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal bar heating equipment field, concretely relates to a heating furnace feeding assembly. BACKGROUND

[0002] Hot forging as an important forming method, is indispensable important link of mechanical product, has extensive application in the fields such as automobile, mechanical equipment, railway, shipbuilding, and the workpiece produced by hot die forging not only high strength, toughness, precision, high complexity, has great market demand and broad development prospect, in hot forging process, first need to heat production raw material (bar), the purpose of pre-forging heating of metal bar is to improve the plasticity of metal, reduce deformation resistance and obtain good post-forging organization, so pre-forging heating is an important link in many forging processes.

[0003] When heating the bar, the bar needs to be placed in the chain plate type heating furnace, however, the temperature of the feeding port of the chain plate type heating furnace is usually high, and the open feeding port radiates heat outward from the feeding port, causing the surrounding temperature to be high, affecting the operator to feed the bar, and seriously endangering the health of the operator, therefore, the operator usually wears heat-resistant gloves to work, and cooperates with the feeding rate of the chain plate type heating furnace to place and process, the working environment temperature is high and the working efficiency is low. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a heating furnace feeding assembly to solve the problem that the feeding position of the operator is short from the feeding port of the heating furnace in the traditional bar feeding process, and easy to cause safety accidents.

[0005] To solve the above technical problem, the utility model provides the following technical scheme:

[0006] A heating furnace feeding assembly, comprising a rack and a material moving device, the rack is used for placing the bar, and the material moving device is used for holding the bar and throwing the bar to the feeding port of the heating furnace.

[0007] The rack comprises a frame and a rectangular material receiving plate, the material receiving plate is fixedly connected with the frame, two opposite sides of the material receiving plate parallel to the X-axis are horizontally arranged, and one side is higher than the other side, so that the top wall of the material receiving plate forms a slope surface extending along the Y-axis direction, the bar is placed on the material receiving plate, and the axis of the bar is arranged along the X-axis direction, and the angle of the slope surface allows the bar placed on the material receiving plate to move from the high part of the slope surface to the low part of the slope surface by the gravity of the bar itself.

[0008] The material rack also includes a first material blocking plate disposed on the bottom edge of the material support plate along the Y-axis direction. The first material blocking plate has a side wall extending along the X-axis and Z-axis directions on the side facing the material support plate. When multiple bars are arranged on the slope along the inclined direction of the slope, the first material blocking plate is used to block the bar at the bottom of the slope at the material picking position of the material transfer device, so that the bar and subsequent bars stop moving.

[0009] The X and Y axes are horizontal and perpendicular to each other, while the Z axis is vertical.

[0010] Furthermore, the material rack also includes a slide rail, the first material blocking plate is connected to the slide rail and can slide along the Y-axis direction, the first material blocking plate is provided with a first elongated hole through itself, the length direction of the first elongated hole is parallel to the Y-axis direction, the first material blocking plate is connected to the slide rail by bolts passing through the first elongated hole, thereby enabling the first material blocking plate to move along the Y-axis direction, and thus enabling the distance between the first material blocking plate and the material support plate to be adjusted.

[0011] Furthermore, the material rack also includes two baffles disposed on both sides of the top wall of the material support plate along the X-axis direction. Each baffle is perpendicular to the material support plate and has sidewalls extending along the Y-axis and Z-axis directions. The two baffles are used to block the two ends of the bar stock. As the bar stock rolls down the slope, it is restricted in the middle by the two baffles.

[0012] Furthermore, the baffle plate is provided with a second elongated hole that runs vertically through itself. The length direction of the second elongated hole is parallel to the X-axis. The baffle plate is connected to the support plate by bolts passing through the second elongated hole, so that each baffle plate can move along the X-axis direction on the support plate, thereby allowing the distance between the two baffle plates to be adjusted.

[0013] Furthermore, a distributor is provided below the material support plate. The distributor includes a distributing platform and a first Z-axis driver. The first Z-axis driver is fixedly connected to the material rack, and the actuator of the first Z-axis driver is connected to the distributing platform. The distributing platform is located below the bottom edge of the material support plate along the Z-axis direction, and the material support plate has an opening through which the distributing platform can pass along the Z-axis direction, so that the distributing platform can be driven to move up and down by the first Z-axis driver. The distributing platform is used to support a bar stock below the material support plate and lift the bar stock above the material support plate, so that the bar stock is separated from other bar stock.

[0014] Furthermore, the top of the material distribution table has a V-shaped first positioning groove that extends along the X-axis, and the bar stock is constrained in the middle by the first positioning groove.

[0015] Furthermore, a second blocking plate is fixedly connected to the side of the material distribution platform away from the first blocking plate. The second blocking plate is parallel to the first blocking plate. During the process of the material distribution platform rising, the second blocking plate always blocks the subsequent bar stock between the first Z-axis driver, thereby preventing the subsequent bar stock from intruding into the bottom of the material distribution platform.

[0016] Furthermore, the material transfer device includes a robotic arm and an X-axis driver. The robotic arm is mounted on the actuator of the X-axis driver, which is mounted on a gantry frame and is used to drive the robotic arm to move along the X-axis direction, so that the robotic arm can move back and forth between the unloading port of the material rack and the feeding port of the heating furnace. The robotic arm is used to grab the bar stock lifted by the material distribution platform and release the bar stock at the feeding port of the heating furnace.

[0017] Furthermore, the robotic arm includes a bidirectional Y-axis driver and two grippers. The two actuators of the bidirectional Y-axis driver move in opposite directions and are each connected to one of the grippers. Each gripper has a V-shaped second positioning groove on the side facing the other gripper. The second positioning groove extends along the X-axis direction, and the bar stock is held in the middle by the two second positioning grooves of the two grippers.

[0018] Furthermore, the material transfer device also includes a second Z-axis driver, which is connected to the actuator of the X-axis driver. The actuator of the second Z-axis driver is connected to the bidirectional Y-axis driver. The second Z-axis driver is used to drive the bidirectional Y-axis driver to move along the Z-axis direction, thereby changing the initial position of the gripper so that the center lines of the two second positioning slots are parallel to the axis of the bar stock lifted by the material distribution table.

[0019] Compared with the prior art, this application has the following advantages:

[0020] The embodiments of this utility model use a rack to store a large amount of bar stock, and then use a transfer device to move the bar stock from the rack to the feed inlet of the heating furnace. The operator only needs to replenish the bar stock to the rack, thereby keeping the operator's working position away from the feed inlet of the heating furnace and reducing safety hazards. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] Figure 1 This is a perspective view of the first embodiment of the present invention and the heating furnace;

[0023] Figure 2 This is a side view of the first embodiment of the present invention;

[0024] Figure 3 This is a top view of the first embodiment of the present invention;

[0025] Figure 4 This is a perspective view of the first embodiment of the present utility model;

[0026] Figure 5 for Figure 4 A magnified view of a portion at point A;

[0027] Figure 6 This is a side view of the second embodiment of the present invention;

[0028] The labels in the diagram represent the following:

[0029] 1-Heating furnace; 2-Material rack; 21-Frame; 22-Material support plate; 221-Opening; 222-Rotating shaft; 223-Vibration motor; 23-First material blocking plate; 231-First elongated hole; 24-Slide rail; 25-Baffle plate; 251-Second elongated hole; 3-Distributor; 31-Distributor platform; 311-First positioning groove; 32-First Z-axis driver; 33-Second material blocking plate; 4-Transfer device; 41-Robot arm; 411-Bidirectional Y-axis driver; 412-Gripper; 413-Second positioning groove; 42-X-axis driver; 43-Second Z-axis driver; 44-Gantry frame. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] The feed inlet temperature of the chain plate heating furnace 1 is relatively high, which affects the operator's ability to feed the bar stock. In order to solve this safety hazard, this utility model provides a feeding assembly for the heating furnace 1, which improves the bar stock feeding process to an automated process, allowing the operator to stay away from the feed inlet of the chain plate heating furnace 1.

[0032] In this article, the X-axis and Y-axis are horizontal and perpendicular to each other, while the Z-axis is vertical.

[0033] (First Embodiment)

[0034] refer to Figure 1 , Figure 2 , Figure 3 The heating furnace 1 feeding assembly includes a material rack 2 and a material transfer device 4. The material rack 2 is used to place the bar stock, and the material transfer device 4 is used to grab the bar stock and throw it into the feed port of the heating furnace 1.

[0035] refer to Figure 2 The material rack 2 includes a frame 21 and a rectangular support plate 22. The support plate 22 is fixedly connected to the frame 21. Two opposite sides of the support plate 22, which are parallel to the X-axis, are horizontally arranged, and one side is higher than the other side, so that the top wall of the support plate 22 forms a slope extending along the Y-axis.

[0036] refer to Figure 3 The bar stock is placed on the support plate 22, and the axis of the bar stock is set along the X-axis. The angle of the slope allows the bar stock placed on the support plate 22 to move from the high point of the slope to the low point of the slope by its own gravity.

[0037] refer to Figure 2 The material rack 2 also includes a first material blocking plate 23 disposed on the bottom edge of the material support plate 22 along the Y-axis direction. The first material blocking plate 23 has a side wall extending along the X-axis and Z-axis directions on the side facing the material support plate 22. When multiple bars are arranged on the slope along the inclined direction of the slope, the first material blocking plate 23 is used to block the bar located at the bottom of the slope, so that the bar and subsequent bars stop moving.

[0038] Further, refer to Figure 5 The material rack 2 also includes a slide rail 24. A first material blocking plate 23 is connected to the slide rail 24 and can slide along the Y-axis. The first material blocking plate 23 is provided with a first elongated hole 231 that passes through it. The length direction of the first elongated hole 231 is parallel to the Y-axis. The first material blocking plate 23 is connected to the slide rail 24 by bolts passing through the first elongated hole 231, so that the first material blocking plate 23 can move a certain distance along the Y-axis, thereby making the distance between the first material blocking plate 23 and the material support plate 22 adjustable. This design is used to make the distance between the first material blocking plate 23 and the material support plate 22 adapt to the change in the diameter of the bar stock.

[0039] refer to Figure 3 The material rack 2 also includes two baffle plates 25 disposed on both sides of the top wall of the support plate 22 along the X-axis direction. Each baffle plate 25 is perpendicular to the support plate 22 and has side walls extending along the Y-axis and Z-axis directions. The two baffle plates 25 are used to block the two ends of the bar stock. As the bar stock rolls down the slope, it is restricted in the middle by the two baffle plates 25, thereby guiding the bar stock to move along the target path.

[0040] Further, refer to Figure 5 The baffle plate 25 is provided with a second elongated hole 251 that runs vertically through itself. The length direction of the second elongated hole 251 is parallel to the X-axis. The baffle plate 25 is connected to the support plate 22 by bolts passing through the second elongated hole 251, so that each baffle plate 25 can move a certain distance along the X-axis on the support plate 22, thereby making the distance between the two baffle plates 25 adjustable. This design is used to make the distance between the baffle plates 25 adapt to the change of the axial length of the bar stock.

[0041] In summary, the material rack 2 can hold a large number of bars, and the first blocking plate 23 and the baffle plate 25 of the material rack 2 can be adjusted to adapt to changes in the diameter and length of the bars. When the bar at the lowest point of the material rack 2 (the material picking position of the material transfer device 4) is removed, the remaining bars can move towards the lowest point of the material rack 2 by their own gravity, so that the material transfer device 4 can always pick up the bars in a fixed position.

[0042] On the other hand, after solving the storage and supply of bar stock, it is also necessary to solve the problem of how the transfer device 4 acquires and transfers the bar stock. Because the bar stock is tightly arranged on the support plate 22, it is difficult to grasp. To solve this problem, refer to... Figure 2 A feeder 3 is provided below the material support plate 22. The feeder 3 includes a feeder platform 31 and a first Z-axis driver 32. The first Z-axis driver 32 is fixedly connected to the material rack 2, and the actuator of the first Z-axis driver 32 is connected to the feeder platform 31.

[0043] The material distribution table 31 is located below the bottom edge of the material support plate 22 along the Z-axis direction, and the material support plate 22 is provided with an opening 221 through which the material distribution table 31 can pass along the Z-axis direction, so that the material distribution table 31 can be driven to move up and down by the first Z-axis driver 32.

[0044] The first Z-axis driver 32 uses a one-way cylinder. The top of the sorting table 31 has a V-shaped first positioning groove 311, which extends along the X-axis. The bar stock is constrained in the middle by the first positioning groove 311. A second blocking plate 33 is fixedly connected to the side of the sorting table 31 away from the first blocking plate 23. The second blocking plate 33 is parallel to the first blocking plate 23. During the rising process of the sorting table 31, the second blocking plate 33 always blocks the subsequent bar stock between the one-way cylinder, thereby preventing the subsequent bar stock from intruding into the bottom of the sorting table 31 and hindering the reset of the sorting table 31.

[0045] The working principle of the material distribution table 31 is:

[0046] Step 1: The first Z-axis driver 32 drives the sorting table 31 to move upward. The sorting table 31 supports a bar material below the support plate 22 and lifts the bar material above the support plate 22, so that the bar material is separated from other bar materials, thereby facilitating the material handling device 4 to pick up the material. The remaining bar material is blocked by the second blocking plate 33.

[0047] Step 2: The first Z-axis driver 32 drives the sorting table 31 to move downwards until the sorting table 31 descends below the support plate 22. Then, the subsequent bars roll down the slope until the lowest bar contacts the first blocking plate 23.

[0048] On the other hand, after the bar stock is lifted by the feeding platform 31, the transferring device 4 needs to move the bar stock to the feed inlet of the heating furnace 1. In order to reduce the floor space occupied by the material rack 2, and at the same time to extend the distance between the feeding inlet of the material rack 2 and the feed inlet of the heating furnace 1 as much as possible, refer to Figure 1 , Figure 2 and Figure 3 The material handling device 4 includes a robot arm 41 and an X-axis driver 42. The robot arm 41 is mounted on the actuator of the X-axis driver 42, which is mounted on a gantry frame 44. The robot arm 41 is used to drive the robot arm 41 to move along the X-axis direction, so that the robot arm 41 can move back and forth between the unloading port of the material rack 2 and the feeding port of the heating furnace 1. The robot arm 41 is used to grab the bar stock lifted by the material distribution table 31 and release the bar stock at the feeding port of the heating furnace 1.

[0049] The advantage of this design is that it extends the distance between the feeding port of the material rack 2 and the feeding port of the heating furnace 1 without increasing the floor space of the material rack 2.

[0050] refer to Figure 2 and Figure 5 The robotic arm 41 includes a bidirectional Y-axis driver 411 and two grippers 412. The two actuators of the bidirectional Y-axis driver 411 move in opposite directions and are respectively connected to a gripper 412. Each gripper 412 has a V-shaped second positioning groove 413 on the side facing the other gripper 412. The second positioning groove 413 extends along the X-axis direction. The bar stock is held in the middle by the two second positioning grooves 413 of the two grippers 412.

[0051] The X-axis driver 42 is preferably an electric lead screw slide, and the bidirectional Y-axis driver 411 is preferably a bidirectional cylinder.

[0052] Furthermore, the first blocking plate 23, the separating table 31, and the gripper 412 are all staggered from each other in the X-axis direction, so that the movement of the separating table 31 in the Z-axis direction is not affected by the first blocking plate 23 and the gripper 412, and the movement of the gripper 412 in the Y-axis direction is not affected by the first blocking plate 23 and the separating table 31.

[0053] Furthermore, since the change in the diameter of the bar stock will alter the axial height of the bar stock lifted by the sorting table 31, in order to ensure that the center of the gripper 412 can be aligned with the center of the bar stock, the transfer device 4 also includes a second Z-axis driver 43. The second Z-axis driver 43 is connected to the actuator of the X-axis driver 42, and the actuator of the second Z-axis driver 43 is connected to the bidirectional Y-axis driver 411. The second Z-axis driver 43 is used to drive the bidirectional Y-axis driver 411 to move along the Z-axis direction, thereby changing the initial position of the gripper 412, so that the center lines of the two second positioning grooves 413 are parallel to the axis of the bar stock lifted by the sorting table 31. This design is used to enable the height of the gripper 412 to adapt to the change in the diameter of the bar stock.

[0054] The second Z-axis driver 43 is preferably an electric lead screw slide.

[0055] (Second Embodiment)

[0056] The bar stock is usually cylindrical and can roll down the slope of the support plate 22. However, the bar stock is not usually a precision-manufactured cylinder. Along its own axis, the diameter of different parts of the bar stock has a certain difference. When the difference in diameter between the two ends of the bar stock is large, the bar stock tends to tilt towards one end during the downward rolling process, which makes it difficult for the bar stock to roll smoothly down the slope of the support plate 22.

[0057] To solve the above problems, in the second embodiment, the bottom edge of the support plate 22 along the Y-axis is rotatably connected to the frame 21 through a rotating shaft 222, the top edge of the support plate 22 along the Y-axis abuts against the frame 21, and the top edge of the support plate 22 along the Y-axis can swing up and down. A vibration motor 223 is installed at the bottom of the support plate 22, and the vibration motor 223 is close to the top edge of the support plate 22 along the Y-axis. The vibration motor 223 is used to drive the support plate 22 to swing, so that the bar placed on the support plate 22 can adjust its own posture under the vibration, so that the bar that is tilted to one end is pushed back to a horizontal posture by the other bars, thereby making the bar roll down the slope of the support plate 22 more smoothly.

[0058] The above embodiments are merely exemplary embodiments of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this utility model within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of this utility model.

Claims

1. A heating furnace feeding assembly, characterized in that, it comprises a rack (2) for placing bars and a bar moving device (4) for grabbing the bars and throwing them to the feeding port of the heating furnace (1); the rack (2) comprises a frame (21) and a rectangular bar receiving plate (22) fixedly connected with the frame (21), two opposite sides of the bar receiving plate (22) are horizontally arranged along the X-axis, and one side is higher than the other side, so that the top wall of the bar receiving plate (22) forms a slope extending along the Y-axis direction, the bars are placed on the bar receiving plate (22), and the axis of the bars is arranged along the X-axis direction, and the angle of the slope allows the bars placed on the bar receiving plate (22) to move from the high part of the slope to the low part of the slope by their own gravity; the rack (2) further comprises a first bar blocking plate (23) arranged at the bottom edge of the bar receiving plate (22) along the Y-axis direction, and the first bar blocking plate (23) has side walls extending along the X-axis and Z-axis directions on one side facing the bar receiving plate (22), when a plurality of bars are arranged on the slope along the inclined direction of the slope, the first bar blocking plate (23) is used to block the bar at the lowest part of the slope at the bar taking position of the bar moving device (4), so that the bar and the subsequent bars stop moving; wherein the X-axis and Y-axis are horizontal directions, and the X-axis and Y-axis are perpendicular, and the Z-axis is a vertical direction.

2. The heating furnace feeding assembly according to claim 1, characterized in that, the rack (2) further comprises a sliding rail (24), the first bar blocking plate (23) is connected with the sliding rail (24) and can slide along the Y-axis direction, the first bar blocking plate (23) is provided with a first long hole (231) penetrating through itself, the length direction of the first long hole (231) is parallel to the Y-axis direction, and the first bar blocking plate (23) is connected with the sliding rail (24) by bolts penetrating through the first long hole (231), so that the first bar blocking plate (23) can move along the Y-axis direction, and the distance between the first bar blocking plate (23) and the bar receiving plate (22) can be adjusted.

3. The heating furnace feeding assembly according to claim 1, characterized in that, the rack (2) further comprises two bar blocking plates (25) arranged on both sides of the top wall of the bar receiving plate (22) along the X-axis direction, each of the bar blocking plates (25) is perpendicular to the bar receiving plate (22) and has side walls extending along the Y-axis and Z-axis directions, and the two bar blocking plates (25) are respectively used to block the two ends of the bars, and the bars are limited in the middle by the two bar blocking plates (25) during the rolling process of the bars along the slope.

4. The heating furnace feeding assembly according to claim 3, characterized in that, The material blocking plate (25) is provided with a second long hole (251) vertically penetrating through itself, the length direction of the second long hole (251) is parallel to the X axis, the material blocking plate (25) is connected to the material receiving plate (22) by penetrating the second long hole (251) with a bolt, so that each material blocking plate (25) can move along the X axis direction on the material receiving plate (22), and the distance between the two material blocking plates (25) can be adjusted.

5. The furnace feeding assembly according to any one of claims 1-4, characterized in that, A distributor (3) is arranged below the material receiving plate (22), the distributor (3) comprises a distributing table (31) and a first Z-axis driver (32), the first Z-axis driver (32) is fixedly connected to the rack (2), the executing part of the first Z-axis driver (32) is connected to the distributing table (31), the distributing table (31) is arranged below the bottom edge of the material receiving plate (22) along the Z axis direction, and the material receiving plate (22) is provided with an opening (221) through which the distributing table (31) can pass along the Z axis direction, so that the distributing table (31) can be driven by the first Z-axis driver (32) to move up and down, and the distributing table (31) is used to support a bar in the lower part of the material receiving plate (22) and lift the bar to the upper part of the material receiving plate (22), so that the bar is separated from other bars.

6. The furnace feeding assembly according to claim 5, characterized in that, The top of the distributing table (31) is provided with a V-shaped first positioning groove (311), the first positioning groove (311) extends along the X axis direction, and the bar is constrained in the middle by the first positioning groove (311).

7. The furnace feeding assembly according to claim 5, characterized in that, The distributing table (31) is fixedly connected with a second material blocking plate (33) away from the first material blocking plate (23), the second material blocking plate (33) is parallel to the first material blocking plate (23), and during the lifting of the distributing table (31), the second material blocking plate (33) always blocks the subsequent bar from the first Z-axis driver (32), so as to avoid the subsequent bar from invading the lower part of the distributing table (31).

8. The furnace feeding assembly according to claim 5, characterized in that, The material moving device (4) comprises a mechanical hand (41) and an X-axis driver (42), the mechanical hand (41) is installed on the executing part of the X-axis driver (42), the X-axis driver (42) is installed on a portal frame (44) and is used to drive the mechanical hand (41) to move along the X axis direction, so that the mechanical hand (41) can move back and forth between the discharge port of the rack (2) and the feeding port of the furnace (1), and the mechanical hand (41) is used to grab the bar lifted by the distributing table (31) and release the bar at the feeding port of the furnace (1).

9. The feeding assembly of a heating furnace according to claim 8, characterized in that, the mechanical arm (41) comprises a bidirectional Y-axis driver (411) and two clamping jaws (412), two execution parts of the bidirectional Y-axis driver (411) respectively move towards opposite directions and are respectively connected to one of the clamping jaws (412), each of the clamping jaws (412) has a V-shaped second positioning groove (413) on the side facing the other clamping jaw (412), the second positioning groove (413) extends along the X-axis direction, and the bar is clamped in the middle by the two second positioning grooves (413) of the two clamping jaws (412).

10. The feeding assembly of a heating furnace according to claim 9, characterized in that, the material moving device (4) further comprises a second Z-axis driver (43), the execution part of the X-axis driver (42) is connected to the second Z-axis driver (43), the execution part of the second Z-axis driver (43) is connected to the bidirectional Y-axis driver (411), and the second Z-axis driver (43) is used to drive the bidirectional Y-axis driver (411) to move along the Z-axis direction, so as to change the initial position of the clamping jaw (412), so that the center lines of the two second positioning grooves (413) are parallel to the axis of the bar lifted by the material distributing table (31).

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