A machining center material conveying device and a material conveying method

Abstract

The present application relates to a material conveying device and a material conveying method for a machining center. The material conveying device for the machining center includes a mounting base, a double-speed chain connected to the mounting base, a secondary positioning assembly, and a plurality of detachable fixtures. A conveying line fixing frame is provided on the mounting base, and the conveying line fixing frame is connected with a closed guide rail. The detachable fixtures are assembled on the guide rail at variable intervals. The detachable fixture includes a loading table, horizontal pulleys located at the lower end of the loading table, and fixing nails. The horizontal pulleys clamp both sides of the track. The double-speed chain is arranged at the inner circle of the guide rail, and a plurality of transmission rods are provided on the outer side of the double-speed chain. The transmission rods are in transmission connection with the fixing nails. When the double-speed chain rotates, the transmission rods drive the detachable fixtures to slide along the guide rail, so that the workpieces carried on the detachable fixtures move accordingly to realize the feeding of the machining center and the removal of the processed products. The present application has the effects of improving the production continuity of the machining center and reducing the loading time of the machining center.

Description

Technical Field

[0001] This application relates to the field of machining center machine tools, and in particular, to a material conveying device and a material conveying method for a machining center. Background Art

[0002] A machining center is a type of machine tool developed further on the basis of ordinary numerical control machine tools. Compared with ordinary numerical control machine tools, a machining center is equipped with a tool magazine and can automatically change tools according to the machining situation. Using a machining center to process products is a common machining method, especially for some precision mechanical parts, which are inseparable from high-precision machining centers. Usually, the machining time of a machining center for processing products is fixed. After a product is processed, manual loading and unloading are required. This process is not only troublesome to operate but also takes a long time, which is not conducive to the continuous production of the machining center. Therefore, most machining center machine tools use robotic loading and add devices for loading.

[0003] Currently, most loading devices on the market are designed such that multiple workpieces are placed on a fixture and then the whole enters the working area. After all the workpieces are processed, they exit the working area for material replacement. Although this method saves a certain amount of material replacement time, since the fixture is often designed in certain fixed shapes, it can only adapt to some simple and regular or specific-shaped workpieces, and has certain limitations for some irregular workpieces.

[0004] The utility model patent publication number CN219258605U discloses a loading device for a machining center, which has a frame. The frame is provided with a indexing turntable and a loading mechanism. The indexing turntable is evenly distributed with a plurality of cylindrical workstations around the circumference. The bottom of adjacent cylindrical workstations is fitted and connected with a workstation connecting rod. The originally protruding workstation connecting rod at the bottom of the cylindrical workstation is changed to an embedded design, so that the workstation connecting rod away from the bottom frame will no longer interfere with the frame. This loading device is designed as a cylindrical workstation and is suitable for some cylindrical parts with a structure similar to that of the cylindrical workstation. If other types of parts are encountered, this loading device cannot be used, and it may be necessary to readjust the device or change to manual loading, which affects the time for a long time.

[0005] The utility model patent publication number CN215700091U discloses a loading device for a machining center, including: a loading conveyor table, a cylinder, a mounting plate, an extension plate, a vertical plate, a servo motor, a support frame, a blanking table, a machining table, a connecting plate, a sliding plate, a connecting frame, a slide rail, a transmission belt, a driven gear, a driving gear, a connecting rod, and a limiting mechanism. This loading device uses a loading conveyor table for loading. During operation, the loading table is in the working area. After the parts on the loading table are processed, they exit the working area and are reloaded. When placing materials on the loading table, the machining center cannot produce, which affects the continuity of machining.

[0006] In view of the related technologies described above, there is a problem that the loading method of the machining center is not coherent enough, resulting in an increase in the loading time of the machining center and being unfavorable to the continuity of the production of the machining center. Summary of the Invention

[0007] In order to make the loading of the machining center more coherent, reduce the loading time of the machining center, and improve the continuity of production, on the first aspect, the present application provides a material conveying device for a machining center, adopting the following technical solutions:

[0008] Provide a material conveying device for a machining center, including:

[0009] An installation base, on which a conveyor line fixing frame is provided. The conveyor line fixing frame is connected with a closed guide rail, and the guide rail has a machine table picking and placing side and a loading and unloading side; an induction optical fiber for primary positioning is fixed on the conveyor line fixing frame;

[0010] A double-speed chain, located inside the guide rail, and a plurality of transmission rods are arranged on the outer side of the double-speed chain;

[0011] A secondary positioning assembly, arranged on the loading and unloading side and fixed on the conveyor line fixing frame;

[0012] A plurality of detachable fixtures, which are assembled on the guide rail at variable intervals. The detachable fixture includes a loading platform, a row of several horizontal pulleys located at the lower end of the loading platform and fixing nails. A track gap is formed between the horizontal pulleys to clamp both sides of the guide rail. The fixing nails are in transmission connection with the transmission rods, and a positioning pin is fixed on the outer side of the loading platform of the detachable fixture;

[0013] Based on the induction of the detachable fixture by the induction optical fiber, when the double-speed chain drives the detachable fixture to move and position, the clamping plate of the secondary positioning assembly rises to fix the positioning pin of the detachable fixture at the corresponding position, so that the loading and unloading vibration of the workpiece on the loading and unloading side does not affect the picking and placing of the workpiece on the machine table picking and placing side.

[0014] By adopting the above technical solutions, the detachable fixtures are spliced on the closed guide rail. The horizontal pulleys at the lower end of the detachable fixtures clamp the guide rail and slide along the guide rail. The detachable fixtures can be driven by the transmission rods to slide along the guide rail from the loading and unloading side to the machine table picking and placing side. The workpiece is placed on the detachable fixture and moves along with the detachable fixture. The moving path of the workpiece is from the loading and unloading side to the machine table picking and placing side, and then the processed product forms a closed loop from the machine table picking and placing side to the loading and unloading side. The workpieces are continuously transported to the machine table picking and placing side, and the processed products can be continuously transported back to the loading and unloading side, without the situation of material stacking or material shortage, improving the continuity of the production of the machining center and reducing the loading time of the machining center.

[0015] Preferably, the installation base further includes a support platform located below the conveyor line fixing frame and a bracket with one end connected to the support platform and the other end connected to the conveyor line fixing frame.

[0016] By adopting the above technical solution, the bracket raises the position of the conveyor line fixing frame, facilitating the installation of other components, reducing the visual blind area, and being beneficial to the maintenance and cleaning of the equipment in the later stage.

[0017] Preferably, the secondary positioning assembly further includes a cylinder connected to the clamping plate, a fixing block connecting the cylinder to the conveyor line fixing frame, and a slide rail connecting the clamping plate to the conveyor line fixing frame.

[0018] Preferably, a U-shaped recess is provided at one end of the clamping plate close to the positioning pin to fix the positioning pin.

[0019] By adopting the above technical solution, the cylinder pushes the clamping plate to rise, and the U-shaped recess at one end of the clamping plate close to the positioning pin fixes the positioning pin, so that the feeding and discharging vibration of the workpiece on the feeding and discharging side does not affect the picking and placing of the workpiece on the picking and placing side of the machine table, effectively improving the accuracy of the manipulator in grasping and clamping the workpiece, and thus improving the processing accuracy of the product.

[0020] Preferably, the machining center material conveying device further includes a driving mechanism, the driving mechanism is arranged on the installation base, and the driving mechanism includes a motor connected under the support platform and a driving wheel sleeved on the motor.

[0021] Preferably, one end of the double-speed chain is sleeved on the driving wheel, the other end of the double-speed chain is sleeved on the driven wheel, and the motor drives the driving wheel to rotate to drive the double-speed chain and the driven wheel to rotate synchronously together.

[0022] Preferably, the driven wheel is connected to the conveyor line fixing frame, and the driven wheel and the driving wheel are of the same size and the two are located on the same horizontal plane.

[0023] By adopting the above technical solution, the positional relationship between the driven wheel and the driving wheel fixture is adjusted so that the double-speed chain is tightly sleeved on the driven wheel and the driving wheel, preventing the double-speed chain from slipping during rotation and affecting the position accuracy of the workpiece. The rotation of the motor drives the synchronous rotation of the driving wheel, the driven wheel and the double-speed chain, and the movement power of the above three is provided by the same power source, avoiding the situation that the rotation paces of the above three are inconsistent due to the actual power error between different power sources.

[0024] Preferably, the minimum distances between the inner sides of the guide rails perpendicular to the outer sides of the chain bodies of the double-speed chains are all equal.

[0025] By adopting the above technical solution, when the transmission rod connected to the double-speed chain drives the jig to move, the moving linear velocity of the detachable jig along the inner side of the guide rail is made consistent, preventing the detachable jig from colliding with the rotating rod, reducing the wear of the horizontal pulley, and also avoiding position deviation during the movement of the jig, which affects the position accuracy of the workpiece.

[0026] In a second aspect, the present application provides a material conveying method, adopting the following technical solution:

[0027] Provided is a material conveying method, using the machining center material conveying device in any of the above technical solutions. The material conveying method includes the following steps:

[0028] S1, assembling a plurality of detachable jigs on the guide rail at variable intervals, wherein the detachable jig is positioned on the guide rail by clamping both sides of the guide rail through a horizontal pulley, and at the same time, the detachable jig forms a transmission connection with the transmission rod through a fixed nail;

[0029] S2, placing the workpiece on the detachable jig at the loading and unloading side;

[0030] S3, driving the detachable jig to slide along the guide rail through the transmission rod;

[0031] S4, initially positioning the workpiece by the sensing optical fiber sensing the positioning pin on the side of the detachable jig;

[0032] S5, fixing the positioning pin by the rising of the clamping plate of the secondary positioning component to perform secondary positioning on the workpiece;

[0033] S6, the positioned workpiece moves to the pick-and-place side of the machine table with the detachable jig to wait for processing;

[0034] S7, the processed product moves to the loading and unloading side for unloading with the detachable jig.

[0035] By adopting the above technical solution, the detachable jig is connected to the guide rail by splicing, and the fixed nail at the lower end of the detachable jig forms a transmission connection with the transmission rod. The connection method between the detachable jig and the guide rail and the transmission rod is simple and easy to disassemble when replacing the jig. Therefore, during production, the corresponding jig can be replaced at any time according to the type of the workpiece, saving the jig replacement time. The simultaneous use of multiple jigs can improve the material conveying efficiency. When the manipulator of the machining center places a processed product back, the next workpiece to be processed immediately moves to the pick-and-place position of the manipulator, reducing the waiting time of the manipulator and improving the continuity of production.

[0036] Preferably, the detachable jig (30) moves intermittently on the guide rail (14).

[0037] By adopting the above technical solution, after the manipulator of the machining center places the processed product back, the detachable fixture moves to remove the processed product from the pick-and-place position of the manipulator, and moves a workpiece to be processed to the pick-and-place position of the manipulator. During the remaining machining time, the detachable fixture does not move, which not only reduces energy consumption but also facilitates the loading and unloading of workpieces.

[0038] In summary, the technical solutions of the embodiments of the present application include at least one of the following beneficial technical effects:

[0039] 1. The workpieces to be processed are continuously transported to the pick-and-place position of the manipulator of the machining center, and the processed products are continuously removed from the pick-and-place position of the manipulator, improving the production continuity of the machining center and reducing the loading time of the machining center.

[0040] 2. The workpieces are positioned and move synchronously with the fixture, double-speed chain, driving wheel, etc., improving the position accuracy of the workpieces and thus the machining accuracy of the products.

[0041] 3. The installation and disassembly methods of the detachable fixture are simple, saving the time for replacing the fixture. There are multiple fixtures on the guide rail, and the fixtures can be replaced one by one without affecting the production of the previous product, reducing the line change time. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Show the front view of the material conveying device of the machining center;

[0043] Figure 2 Show the semi-sectional view of the material conveying device of the machining center along the upper surface of the guide rail;

[0044] Figure 3 Show the structural schematic diagram of the secondary positioning component;

[0045] Figure 4 Show the schematic diagram of the positional relationship between the detachable fixture and the guide rail and the transmission rod;

[0046] Figure 5 Show the schematic diagram of the relative position between the sensing optical fiber and the positioning pin;

[0047] Figure 6 Show the schematic diagram of the material conveying device of the machining center at the machining center.

[0048] Reference numerals: 10, mounting base; 11, support platform; 12, bracket; 13, conveyor line fixing frame; 14, guide rail; 15, sensing optical fiber; 20, secondary positioning assembly; 21, cylinder; 22, slide rail; 23, clamping plate; 24, fixing block; 30, detachable jig; 31, loading table; 32, horizontal pulley; 33, fixing nail; 34, positioning pin; 40, double-speed chain; 41, transmission rod; 42, driven wheel; 50, driving mechanism; 51, motor; 52, driving wheel; 100, workpiece; 200, manipulator. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments that are understood as part of the concept of the present application, and cannot represent all embodiments, nor are they the only embodiments for explanation. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art under the premise of understanding the concept of the present application belong to the scope protected by the present application.

[0050] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present application, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. For the convenience of understanding the technical solutions of the present application, the following will further describe and explain a material conveying device and a material conveying method for a machining center in the present application in detail, but it is not the scope of protection defined by the present application.

[0051] Referring to Figure 1 , a material conveying device for a machining center disclosed in an embodiment of the present application includes a mounting base 10, a secondary positioning assembly 20 connected to the mounting base 10, a plurality of detachable jigs 30 connected to the mounting base 10, and a driving mechanism 50 connected to the mounting base 10. The mounting base 10 includes a support platform 11, a bracket 12 connected to the support platform 11, a conveyor line fixing frame 13 connected to the upper end of the bracket 12, a guide rail 14 connected above the conveyor line fixing frame 13, and a sensing optical fiber 15 connected to the conveyor line fixing frame 13. The bracket 12 supports the conveyor line fixing frame 13 to keep the conveyor line fixing frame 13 away from the surface of the support platform 11, facilitating the installation of other components on the conveyor line fixing frame 13. At the same time, it also reduces the visual blind area between the conveyor line fixing frame 13 and the support platform 11, which is beneficial to the later maintenance and cleaning of the equipment. The sensing optical fiber 15 is located on the left side of the secondary positioning assembly 20, and the sensing optical fiber 15 is located on the right side of the driving mechanism 50.

[0052] Referring toFigure 1 and Figure 2 , Figure 2 is Figure 1 a top view of a half-sectional view along the upper surface of the guide rail 14. The dashed line in Figure 2 is a section line. The view to the left of the dashed line is the unsectioned view, and the view to the right of the dashed line is the view sectioned along the upper surface of the guide rail 14. The driving mechanism 50 includes a motor 51 connected under the support platform 11 and a driving wheel 52 connected to the conveyor line fixing bracket 13. The motor 51 may specifically be, but is not limited to, a servo motor. The guide rail 14 is a closed guide rail. The left and right ends of the guide rail 14 are two semi-circular tracks that are mirror images of each other, and the middle of the guide rail 14 is two parallel tracks that respectively connect the two semi-circular tracks. A double-speed chain 40 similar in shape to the guide rail 14 is provided at the inner circle of the guide rail 14, and the vertical distance between the inner side of the guide rail 14 and the outer side of the chain body of the double-speed chain 40 is equal at each location. The horizontal side of the guide rail 14 close to the secondary positioning assembly 20 is the loading and unloading side, and the horizontal side of the guide rail 14 far from the secondary positioning assembly 20 is the machine table picking and placing side.

[0053] A plurality of regularly arranged transmission rods 41 are provided on the outer side of the double-speed chain 40, and the distances between the transmission rods 41 are equal. The right end of the double-speed chain 40 is sleeved on a driven wheel 42, and the driven wheel 42 is fixed on the conveyor line fixing bracket 13. The left end of the double-speed chain 40 is sleeved on the driving wheel 52. The driving wheel 52 and the driven wheel 42 have the same outer diameter and the aforementioned two are located on the same horizontal plane. When the driving wheel 52 rotates, it will drive the double-speed chain 40 and the driven wheel 42 to rotate synchronously.

[0054] Referring to Figure 3 , the secondary positioning assembly 20 includes a cylinder 21, a clamping plate 23 connected to the cylinder 21, a slide rail 22 connected to the clamping plate 23, and a fixing block 24 connecting the cylinder 21 and the slide rail 22. The end of the clamping plate 23 away from the cylinder 21 is provided with a U-shaped recess. The slide rail 22 movably fixes the clamping plate 23 on the fixing block 24, effectively preventing the clamping plate 23 from shaking during movement, so as not to affect the positioning effect of the secondary positioning assembly 20.

[0055] Referring to Figure 4, the detachable jig 30 includes a placement table 31, horizontal pulleys 32 connected to the lower end of the placement table 31, fixed nails 33 connected to the lower end of the placement table 31, and positioning pins 34 connected to the side of the placement table 31. Above the placement table 31 is used to place the workpiece 100 to be processed or the finished product. The horizontal pulleys 32 may specifically be, but are not limited to, 4. The horizontal pulleys 32 are respectively located on both sides of the guide rail 14. There is an orbital gap between the horizontal pulleys 32 to clamp the two sides of the guide rail 14, and the horizontal pulleys 32 can slide along the guide rail 14. The fixed nails 33 may specifically be, but are not limited to, 2. The fixed nails 33 are in transmission connection with the transmission rod 41. The detachable jig 30 slides along the track of the guide rail 14 driven by the transmission rod 41.

[0056] Referring to Figure 5 , the sensing optical fiber 15 is connected to the conveyor line fixing bracket 13. The sensing position at the upper end of the sensing optical fiber 15 senses the positioning pin 34 to determine the position of the detachable jig 30 on the guide rail 14.

[0057] Continue to refer to Figure 1 and Figure 3 , the fixing block 24 is connected to the conveyor line fixing bracket 13. When the detachable jig 30 carrying the workpiece 100 moves to the position of the secondary positioning assembly 20, the clamping plate 23 is pushed up by the cylinder 21. The U-shaped depression of the clamping plate 23 clamps the positioning pin 34 to fix the position of the detachable jig 30.

[0058] The implementation principle of a material conveying device of a machining center according to an embodiment of the present application is as follows: The double-speed chain 40 is located inside the guide rail 14. The double-speed chain 40 is sleeved on the driving wheel 52 and the driven wheel 42. A plurality of transmission rods 41 are provided on the outer side of the double-speed chain 40, and the double-speed chain 40 moves synchronously with the driving wheel 52.

[0059] A plurality of the detachable jigs 30 are assembled on the guide rail 14. The horizontal pulleys 32 below the detachable jig 30 clamp the guide rail 14. The fixed nails 33 below the detachable jig 30 are in transmission connection with the transmission rods 41 on the outer side of the double-speed chain 40. The detachable jig 30 will slide along the track of the guide rail 14 driven by the transmission rods 41. The detachable jig 30 slides around on the closed guide rail 14 to transport the workpiece 100 to be processed on the detachable jig 30 to the machine tool pick-and-place side and transport the finished product on the detachable jig 30 back to the loading and unloading side.

[0060] Referring to Figure 2 and Figure 6, an embodiment of the present application also discloses a material conveying method, which uses the processing center material conveying device in the embodiment of the present application. Among them, the loading and unloading side is used to place the workpiece 100 to be processed on the detachable fixture 30 and take the processed product off the detachable fixture 30, and the machine tool picking and placing side is used for the manipulator 200 of the processing center to place the processed product on the detachable fixture 30 and the manipulator 200 to clamp the workpiece 100 to be processed to the processing position of the processing center. The material conveying method includes the following steps:

[0061] S1, Assemble a plurality of detachable fixtures 30 on the guide rail 14 at variable intervals, wherein the detachable fixture 30 is positioned on the guide rail 14 by clamping both sides of the guide rail 14 through the horizontal pulley 32, and at the same time, the detachable fixture 30 forms a transmission connection with the transmission rod 41 through the fixing staple 33;

[0062] S2, Place the workpiece 100 on the detachable fixture 30 on the loading and unloading side;

[0063] S3, Drive the detachable fixture 30 to slide along the guide rail 14 through the transmission rod 41;

[0064] S4, Initially position the workpiece 100 by sensing the positioning pin 34 on the side of the detachable fixture 30 through the sensing optical fiber 15;

[0065] S5, Raise and fix the positioning pin 34 through the clamping plate 23 of the secondary positioning assembly 20 to perform secondary positioning on the workpiece 100;

[0066] S6, The positioned workpiece 100 moves to the machine tool picking and placing side with the detachable fixture 30 and waits for processing;

[0067] S7, The processed product moves to the loading and unloading side for unloading with the detachable fixture 30.

[0068] The implementation principle of a material conveying method in an embodiment of the present application is: Select a suitable detachable fixture 30 according to the situation of the workpiece 100, assemble a plurality of detachable fixtures 30 on the guide rail 14, and adjust the distance between the detachable fixtures 30 according to the size of the detachable fixture 30 or the size of the workpiece 100 to avoid mutual extrusion and collision of the detachable fixture 30 or the workpiece 100 at the turning of the guide rail 14, which affects the position accuracy of the workpiece 100.

[0069] The detachable jig 30 moves along the track of the guide rail 14 driven by the transmission rod 41. The moving direction of the detachable jig 30 is from the sensing optical fiber 15 to the secondary positioning assembly 20, then from the secondary positioning assembly 20 to the pick-and-place side of the machine table, and finally from the pick-and-place side of the machine table to the sensing optical fiber 15. The detachable jig 30 determines its position through the sensing optical fiber 15 during the movement. When the detachable jig 30 passes through the secondary positioning assembly 20, the positioning pin 34 is fixed by the clamping plate 23 to stabilize the detachable jig 30, reducing the influence of the loading and unloading vibration of the workpiece 100 on the pick-and-place side on the position accuracy of the detachable jig 30.

[0070] The detachable jig 30 moves intermittently on the guide rail 14. When the manipulator 200 places the processed product back onto the detachable jig 30, the detachable jig 30 moves along the guide rail 14 in the moving direction of the detachable jig 30 by a distance equal to the pitch between the detachable jigs 30 to transport the workpiece 100 to be processed to the grasping position of the manipulator 200. At other times, the detachable jig 30 is in a stationary waiting state.

[0071] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A material conveying device for a machining center, characterized in that, Comprising: An installation base (10), on which a conveyor line fixing bracket (13) is provided. The conveyor line fixing bracket (13) is connected to a closed guide rail (14), and the guide rail (14) has a machine table picking and placing side and a loading and unloading side; An induction optical fiber (15) for primary positioning is fixed on the conveyor line fixing bracket (13); A double-speed chain (40), located inside the guide rail (14), and a plurality of transmission rods (41) are provided on the outer side of the double-speed chain (40); A secondary positioning assembly (20), arranged on the loading and unloading side and fixed on the conveyor line fixing bracket (13); A plurality of detachable fixtures (30), assembled on the guide rail (14) with variable spacing. The detachable fixture (30) includes a loading platform (31), a plurality of horizontal pulleys (32) arranged in rows at the lower end of the loading platform (31), and fixing nails (33). An orbital gap is formed between the horizontal pulleys (32) to clamp both sides of the guide rail (14). A transmission connection is formed between the two fixing nails (33) and the corresponding transmission rod (41). A positioning pin (34) is fixed on the outer side of the loading platform (31) of the detachable fixture (30). The detachable fixture (30) slides along the track of the guide rail (14) driven by the transmission rod (41); Based on the induction of the detachable fixture (30) by the induction optical fiber (15), when the double-speed chain (40) drives the detachable fixture (30) to move and position, the clamping plate (23) of the secondary positioning assembly (20) rises to fix the positioning pin (34) of the detachable fixture (30) at the corresponding position, so that the loading and unloading vibration of the workpiece on the loading and unloading side does not affect the picking and placing of the workpiece on the machine table picking and placing side; The secondary positioning assembly (20) further includes a cylinder (21) connecting the clamping plate (23), a fixing block (24) connecting the cylinder (21) to the conveyor line fixing bracket (13), and a slide rail (22) connecting the clamping plate (23) to the conveyor line fixing bracket (13); The clamping plate (23) is provided with a U-shaped depression at one end close to the positioning pin (34) to fix the positioning pin (34); The minimum distances between the inner vertical surface of the guide rail (14) and the outer side surface of the chain body of the double-speed chain (40) are all equal. The horizontal side of the guide rail (14) close to the secondary positioning assembly (20) is the loading and unloading side, the horizontal side of the guide rail (14) far from the secondary positioning assembly (20) is the machine table picking and placing side, and the distances between the transmission rods (41) are all equal.

2. The material conveying device of the machining center according to claim 1, characterized in that The installation base (10) further includes a support platform (11) located below the conveyor line fixing bracket (13) and a bracket (12) with one end connected to the support platform (11) and the other end connected to the conveyor line fixing bracket (13).

3. The material conveying device of the machining center according to claim 2, wherein, It further includes a driving mechanism (50) which is arranged on the mounting base (10). The driving mechanism (50) includes a motor (51) connected under the support platform (11) and a driving wheel (52) sleeved on the motor (51).

4. The material conveying device of the machining center according to claim 3, characterized in that, One end of the speed chain (40) is sleeved on the driving wheel (52), and the other end of the speed chain (40) is sleeved on a driven wheel (42). The motor (51) drives the driving wheel (52) to rotate so as to drive the speed chain (40) and the driven wheel (42) to rotate synchronously together.

5. The material conveying device of the machining center according to claim 4, wherein, The driven wheel (42) is connected to the conveyor line fixing frame (13), and the driven wheel (42) is the same size as the driving wheel (52) and the two are located on the same horizontal plane.

6. A material conveying method, characterized in that, Adopt the machining center material conveying device according to any one of claims 1-5. The material conveying method includes: S1, assembling a plurality of detachable fixtures (30) on the guide rail (14) at variable intervals. The detachable fixture (30) is positioned on the guide rail (14) by clamping both sides of the guide rail (14) through a horizontal pulley (32). At the same time, the detachable fixture (30) forms a transmission connection with the transmission rod (41) through a fixing nail (33); S2, placing the workpiece (100) on the detachable fixture (30) at the loading and unloading side; S3, driving the detachable fixture (30) to slide along the guide rail (14) through the transmission rod (41); S4, initially positioning the workpiece (100) by the induction optical fiber (15) sensing the positioning pin (34) on the side of the detachable fixture (30); S5, raising and fixing the positioning pin (34) by the clamping plate (23) of the secondary positioning assembly (20) to perform secondary positioning on the workpiece (100); S6, the positioned workpiece (100) moves to the machine tool picking and placing side with the detachable fixture (30) to wait for processing; S7, the processed product moves to the loading and unloading side with the detachable fixture (30) for unloading; Wherein, the detachable fixture (30) moves intermittently on the guide rail (14).

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