A wind-powered automatic feeding device and automatic feeding method for a CNC lathe

Abstract

The present invention provides a wind-powered automatic feeding device and an automatic feeding method for a numerically controlled lathe, belonging to the field of numerically controlled lathe processing, and comprising a spindle connecting device connected to the spindle of the lathe, a wind power device for producing wind power, a clamping sliding device, a limit device for adjusting the feeding length, and an elastic device. The material is clamped by the clamping sliding device, and when the spindle rotates, under the action of the wind power generated by the wind power device, the clamping sliding device slides backward in the slide groove of the spindle connecting device, and when the spindle stops rotating and the claw is released, the clamping sliding device slides forward along the slide groove in the spindle connecting device under the push of the elastic device, thereby realizing automatic feeding, freeing manual pulling of materials, and improving efficiency. The length of the fed material can be adjusted by the limit device, thereby realizing the wind-powered automatic feeding function of materials of different diameters and lengths.

Description

Technical Field

[0001] The invention belongs to the technical field of CNC lathe processing, and in particular relates to a pneumatic automatic feeding device and an automatic feeding method for a CNC lathe. Background Art

[0002] When CNC lathes process materials, the raw materials are long and thin wire coils or medium and large diameter bars. Currently, the method of "manual pulling + CNC processing" is adopted. The specific operation process of manual pulling is "open the door - release the claws - pull the material - measure the size - lock the claws - close the door". The operation is cumbersome and inefficient, and it is impossible to achieve continuous automatic processing of multiple products in the same batch on the CNC lathe. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the inventor has conducted intensive research and provided a wind-powered automatic feeding device for a CNC lathe, comprising a spindle connecting device connected to the spindle of the lathe, a wind-powered device for producing wind power, a clamping sliding device, a limiting device for adjusting the feeding length, and an elastic device. The material is clamped by the clamping sliding mechanism. When the spindle of the lathe rotates, under the action of the wind power generated by the wind power device, the clamping sliding device slides backward along the slide groove in the inner cavity of the spindle connecting device. When the spindle of the lathe stops rotating and the claw is released, the clamping sliding device slides forward along the slide groove in the inner cavity of the spindle connecting device with the material entrained under the elastic push of the elastic device, thereby realizing automatic feeding, freeing manual pulling, and improving efficiency. The length of the material fed can be adjusted by the limiting device, realizing the wind-powered automatic feeding function of materials of different diameters and lengths. The automatic feeding device and the automatic feeding method of the present invention overcome the problem of low efficiency caused by manual pulling operation when the CNC lathe processes materials. The wind-powered automatic feeding makes the operation simple and effective, and improves production efficiency, thereby completing the present invention.

[0004] The technical solution provided by the present invention is as follows:

[0005] In a first aspect, a pneumatic automatic feeding device for a numerically controlled lathe comprises a spindle connecting device connected to a spindle of the lathe, a wind device for producing wind force, a clamping sliding device and an elastic device, wherein the spindle connecting device is a cylindrical structure having a cylindrical inner cavity, a slide groove is axially opened on the inner cavity wall, a flange is processed at the front end, and a bottom plate is sealed at the rear end, a ventilation hole and a light hole for penetrating the wind device are processed on the bottom plate, and the spindle connecting device is embedded in the spindle of the numerically controlled lathe, and is fixedly connected to the front end of the spindle of the lathe through the front flange;

[0006] The wind power device is a hollow shaft with fan blades at the rear, the front end of the hollow shaft is fixedly connected to the clamping sliding device, and the rear end is provided with a positioning platform, the outer diameter of the positioning platform is larger than the diameter of the light hole on the bottom plate of the main shaft connecting device, and is used to limit the end position of the forward sliding of the clamping sliding device;

[0007] The clamping sliding device includes a clamping mechanism and a sliding mechanism. The front end of the clamping mechanism is a split-petal conical horn structure, which is used to clamp the material passing through the inside of the wind power device, and the rear end is a hollow shaft section, which is fixedly connected to the front end of the sliding mechanism. The large end of the split-petal conical horn structure is a free end, and the small end is connected to the hollow shaft section as a whole; the sliding mechanism is processed with a slider that cooperates with the slide groove on the main shaft connecting device. When the lathe spindle rotates and causes the fan blades to rotate, the sliding mechanism drives the clamping mechanism to move backward along the slide groove and compresses the elastic device inside the cavity of the main shaft connecting device. After the lathe spindle stops rotating and the claws are released, the sliding mechanism drives the clamping mechanism that clamps the material to move forward along the slide groove under the push of the elastic device to deliver the material to be processed.

[0008] In a second aspect, a method for automatic pneumatic feeding of a CNC lathe comprises the following steps:

[0009] placing the elastic device in the inner cavity of the main shaft connecting device;

[0010] Clamp the material with the clamping slide device and extend it into the slide groove in the inner cavity of the spindle connecting device;

[0011] The wind device is fixedly connected to the clamping sliding device;

[0012] The spindle connection device is connected and fixed to the spindle of the CNC lathe through a flange, and the clamping claws on the spindle of the CNC lathe clamp the material;

[0013] Start the lathe, the CNC lathe spindle rotates to drive the wind device and the spindle connection device to rotate synchronously. Because the friction between the clamping mechanism and the material is smaller than the wind force generated by the rotation of the wind device, the wind pulls the clamping slide device to slide backward along the slide groove of the spindle connection device and presses the elastic device. The clamping slide device moves backward on the material, and the moving distance is the length of the material to be processed next time;

[0014] When the processing of the upper material is completed, the spindle of the CNC lathe stops rotating, the wind-powered automatic feeding device stops rotating, the wind disappears, the CNC lathe spindle claws are released, and under the elastic force of the elastic device, the clamping sliding device slides forward along the slide groove of the spindle connecting device until the positioning table contacts the bottom plate of the spindle connecting device, automatically feeding the material to continue processing the next section of the material.

[0015] The pneumatic automatic feeding device and automatic feeding method for a CNC lathe provided by the present invention have the following beneficial effects:

[0016] (1) The present invention provides a wind-driven automatic feeding device and an automatic feeding method for a CNC lathe. By setting a spindle connecting device connected to the spindle of the lathe and a wind-driven device for generating wind force, the feeding is automated. Since the spindle connecting device is fixedly connected to the spindle of the CNC lathe, the wind-driven device is driven to rotate when the spindle of the CNC lathe rotates to generate wind force. There is no need to introduce an additional power source for pulling the clamping sliding device. When the spindle of the CNC lathe stops rotating, the wind force disappears. Under the elastic action of the elastic device, the clamping sliding device can automatically return to the initial position to complete the feeding, so that the feeding control method is simple and accurate.

[0017] (2) The present invention provides a pneumatic automatic feeding device and automatic feeding method for a CNC lathe. The sliding mechanism in the clamping sliding device cooperates with the slide groove in the inner cavity of the spindle connecting device through the slider, so that the automatic feeding stroke is stable and controllable; the arrangement of the petal conical horn structure on the clamping mechanism can adjust the opening size of the petal conical horn structure by adjusting the length of the clamping mechanism extending into the sliding mechanism, and can be used for clamping materials of different diameters;

[0018] (3) The present invention provides a pneumatic automatic feeding device and an automatic feeding method for a CNC lathe. The design of the limiting device makes the length of the automatic feeding adjustable, which greatly improves the diversity of product processing and the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a pneumatic automatic feeding device for a CNC lathe of the present invention;

[0020] Figure 2 It is a schematic structural diagram of the main shaft connection device of the present invention;

[0021] Figure 3 It is a cross-sectional structural schematic diagram of a pneumatic automatic feeding device for a CNC lathe of the present invention;

[0022] Figure 4 for Figure 3 A partial enlarged schematic diagram of the position A in the middle;

[0023] Figure 5 It is a schematic diagram of the structure of the clamping mechanism of the present invention;

[0024] Figure 6 It is a schematic diagram of the sliding mechanism structure of the present invention.

[0025] Description of Figure Numbers

[0026] 1-main shaft connecting device; 11-slide groove; 12-ventilation hole; 13-light hole; 2-wind device; 3-clamping sliding device; 31-clamping mechanism; 311-elastic pad; 32-sliding mechanism; 33-first locking mechanism; 34-second locking mechanism; 4-limiting device; 5-elastic device. DETAILED DESCRIPTION

[0027] The following detailed description of the present invention will make the features and advantages of the present invention more clear and explicit.

[0028] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0029] According to a first aspect of the present invention, there is provided a pneumatic automatic feeding device for a CNC lathe, such as Figure 1 As shown, the automatic feeding device includes a spindle connecting device 1 connected to the spindle of the lathe, a wind device 2 for producing wind force, a clamping sliding device 3 and an elastic device 5. The spindle connecting device 1 is a cylindrical structure with a cylindrical inner cavity, a slide groove 11 is axially opened on the inner cavity wall, a flange is processed at the front end, and the rear end is sealed with a bottom plate. The bottom plate is processed with a ventilation hole 12 and a light hole 13 for penetrating the wind device 2. The spindle connecting device 1 is embedded in the spindle of the CNC lathe and is fixedly connected to the front end of the spindle of the lathe through the front flange;

[0030] The wind power device 2 is a hollow shaft with fan blades at the rear, and the front end of the hollow shaft is fixedly connected to the clamping sliding device 3. Preferably, the front end of the hollow shaft is processed with external threads and fixedly connected to the clamping sliding device 3; a positioning platform is provided at the rear end, and the outer diameter of the positioning platform is larger than the diameter of the light hole on the bottom plate of the main shaft connecting device 1, and is used to limit the terminal position of the forward sliding of the clamping sliding device 3;

[0031] The clamping sliding device 3 comprises a clamping mechanism 31 and a sliding mechanism 32. The front end of the clamping mechanism 31 is a petal-shaped conical horn structure for clamping materials passing through the inside of the wind power device 2. The rear end is a hollow shaft section, which is fixedly connected to the front end of the sliding mechanism 32. The large end of the petal-shaped conical horn structure is a free end, and the small end is connected to the hollow shaft section as a whole. The opening size of the petal-shaped conical horn structure can be adjusted by adjusting the length of the clamping mechanism 31 extending into the sliding mechanism 32, and can be used for clamping materials of different diameters. The sliding mechanism 32 is processed with a main shaft The slider cooperates with the slide groove on the connecting device 1. When the lathe spindle rotates and causes the fan blades to rotate, the sliding mechanism 32 drives the clamping mechanism 31 to move backward along the slide groove (at this time, the material is gripped by the claws on the lathe spindle and does not move, and the sliding clamping mechanism 31 moves backward by friction on the material), and compresses the elastic device 5 inside the cavity of the spindle connecting device 1. After the lathe spindle stops rotating and the claws are released, the sliding mechanism 32 drives the clamping mechanism 31 that clamps the material to move forward along the slide groove under the push of the elastic device 5, and delivers the material to be processed.

[0032] In a preferred embodiment of the present invention, Figure 2 As shown, a longitudinal through hole is processed on the flange of the spindle connection device 1, and the spindle connection device 1 is fixed on the spindle of the lathe by a threaded connector penetrating through the longitudinal through hole on the flange.

[0033] Furthermore, the light hole 13 is located at the center of the bottom plate.

[0034] Furthermore, the ventilation holes 12 are evenly distributed around the light holes 13 on the bottom plate.

[0035] Furthermore, the inner cavity of the main shaft connecting device 1 is provided with N slide grooves 11, N≥2, preferably N=2 or 3, such as two symmetrically arranged slide grooves or three slide grooves evenly distributed in the circumferential direction.

[0036] In the present invention, Figure 1 and Figure 3 As shown, the outer diameter of the shaft section where the fan blades on the wind power device 2 are located is smaller than the outer diameter of the shaft section located in the inner cavity of the main shaft connecting device 1. The design of the unequal diameter shaft section facilitates the installation of large diameter fan blades at the tail of the wind power device 2, thereby improving the wind drive efficiency.

[0037] Furthermore, the fan blades are in M ​​groups, M≥1, preferably M=1 or 2.

[0038] In a preferred embodiment of the present invention, Figure 1 , 4 As shown in Figure 5, a groove is processed on the inner wall of the front end of the cone-shaped horn structure of the clamping mechanism 31, and an elastic pad 311 is embedded and bonded in the groove. The elastic pad 311 is preferably a rubber pad.

[0039] Furthermore, if Figure 3 , Figure 4 and Figure 6 As shown, the sliding mechanism 32 is a stepped shaft structure, the front end is a small end, which is fixedly connected to the clamping mechanism, and the rear end is a large end, which is fixed in the inner cavity of the main shaft connecting device 1 through a slider. The inner walls of the shafts at both ends of the sliding mechanism 32 are processed with internal threads, the internal threads of the front shaft cooperate with the external threads opened in the hollow shaft section at the tail of the clamping mechanism 31, and the internal threads of the rear shaft cooperate with the external threads opened at the head of the wind power device 2.

[0040] Furthermore, if Figure 3 , Figure 4 and Figure 5As shown, the inner wall of the small end of the sliding mechanism 32 is processed with a first thread groove, the inner wall of the large end of the step shaft is processed with a second thread groove, the outer wall of the hollow shaft section of the clamping mechanism 31 is processed with a third thread groove, and the outer wall of the front end of the hollow shaft body of the wind power device 2 is processed with a fourth thread groove. The first thread groove and the third thread groove are embraced to form a complete first threaded hole, and the first threaded hole cooperates with the first locking mechanism 33 to circumferentially lock the clamping mechanism 31 and the sliding mechanism 32; the second thread groove and the fourth thread groove are embraced to form a complete second threaded hole, and the first threaded hole cooperates with the second locking mechanism 34 to circumferentially lock the wind power device 2 and clamp the sliding device 3. Preferably, the first locking mechanism 33 and the second locking mechanism 34 are rod-shaped threaded connectors, such as bolts or screws.

[0041] In the present invention, Figure 1 , Figure 3 and Figure 4 As shown, a threaded through hole is processed on the sliding mechanism 32, and a limit device 4 is inserted inside the threaded through hole. The end of the limit device 4 corresponds to the bottom plate frame of the main shaft connecting device 1. The length of the limit device 4 entering the inner cavity of the main shaft connecting device 1 is not less than the length of the inner cavity slide groove of the main shaft connecting device 1, which is used to adjust the sliding distance of the clamping slide device 3 to realize the transportation of materials of different lengths. The fan blades at the tail of the wind power device 2 rotate to drive the clamping slide device 3 to move backward, so that the limit device 4 contacts the bottom plate of the main shaft connecting device 1, preventing the clamping slide device 3 from moving backward further. The distance from the bottom end face of the limit device 4 to the bottom plate is the sliding distance of the clamping slide device 3 along the slide groove in the inner cavity of the main shaft connecting device 1, that is, the distance that the clamping mechanism 31 slides on the material by friction, which is also the length of the material to be transported. Preferably, the limit device 4 is a limit screw.

[0042] In a preferred embodiment of the present invention, Figure 1 and Figure 3 As shown, the elastic device 5 is a spring, and its natural length is sufficient to be accommodated in the space enclosed by the main shaft connecting device 1 and the clamping sliding device 3.

[0043] According to a second aspect of the present invention, there is provided a method for automatic pneumatic feeding of a CNC lathe, comprising the following steps:

[0044] Place the elastic device 5 in the inner cavity of the main shaft connecting device 1;

[0045] Clamp the material with the clamping slide device 3 and extend it into the slide groove in the inner cavity of the main shaft connecting device 1;

[0046] The wind power device 2 is fixedly connected to the clamping sliding device 3;

[0047] The spindle connection device 1 is connected and fixed to the spindle of the CNC lathe through a flange, and the clamping claws on the spindle of the CNC lathe clamp the material;

[0048] Start the lathe, the CNC lathe spindle rotates to drive the wind device 2 and the spindle connection device 1 to rotate synchronously. Because the friction between the clamping mechanism and the material is smaller than the wind force generated by the rotation of the wind device 2, the wind pulls the clamping slide device 3 to slide backward along the slide groove of the spindle connection device 1 and presses the elastic device 5. The clamping slide device 3 moves backward on the material, and the moving distance is the length of the material to be processed next time;

[0049] When the processing of the upper section of the material is completed, the spindle of the CNC lathe stops rotating, the wind-powered automatic feeding device stops rotating, the wind disappears, the CNC lathe spindle claws are released, and under the elastic force of the elastic device 5, the clamping sliding device 3 slides forward along the slide groove of the spindle connecting device 1 until the positioning table contacts the bottom plate of the spindle connecting device 1, and the material is automatically fed out. There is no need to open the car door to manually pull out the material and measure the size, and the processing of the next section of the material can continue.

[0050] In a preferred embodiment, a threaded through hole is processed on the sliding mechanism 32, and a limiting device 4 is inserted into the threaded through hole, so that the limiting device 4 enters the inner cavity of the main shaft connecting device 1, and the length of the extending into the inner cavity of the main shaft connecting device 1 is adjusted so that the length is not less than the length of the inner cavity slide groove of the main shaft connecting device 1; when the lathe is started, the wind force pulls the clamping sliding device 3 to slide backward along the slide groove of the main shaft connecting device 1 until the limiting device 4 contacts the bottom plate of the main shaft connecting device 1, and the distance from the bottom end face of the limiting device 4 to the bottom plate is the length of the material to be conveyed.

[0051] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0052] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A pneumatic automatic feeding device for a CNC lathe, characterized in that: The invention comprises a main shaft connecting device (1) connected to a main shaft of a lathe, a wind power device (2) for generating wind power, a clamping sliding device (3) and an elastic device (5), wherein the main shaft connecting device (1) is a cylindrical structure having a cylindrical inner cavity, a sliding groove (11) is axially opened on the inner cavity wall, a flange is processed at the front end, and the rear end is sealed with a bottom plate, a ventilation hole (12) and a light hole (13) for passing the wind power device (2) are processed on the bottom plate, and the light hole (13) is located at the center of the bottom plate, and the main shaft connecting device (1) is embedded in the main shaft of a numerically controlled lathe and fixedly connected to the front end of the main shaft of the lathe via the front flange; The wind power device (2) is a hollow shaft with fan blades at the rear, the front end of the hollow shaft is fixedly connected to the clamping sliding device (3), and the rear end is provided with a positioning platform, the outer diameter of the positioning platform is larger than the diameter of the light hole on the bottom plate of the main shaft connecting device (1), and is used to limit the end position of the forward sliding of the clamping sliding device (3); The clamping sliding device (3) comprises a clamping mechanism (31) and a sliding mechanism (32). The front end of the clamping mechanism (31) is a split cone horn structure for clamping materials passing through the inside of the wind power device (2). The rear end is a hollow shaft section fixedly connected to the front end of the sliding mechanism (32). The large end of the split cone horn structure is a free end, and the small end is connected to the hollow shaft section as a whole. The sliding mechanism (32) is processed with a slider that cooperates with the slide groove on the main shaft connecting device (1). When the lathe main shaft rotates and causes the fan blades to rotate, the sliding mechanism (32) drives the clamping mechanism (31) to move backward along the slide groove and compress the elastic device (5) inside the cavity of the main shaft connecting device (1). After the lathe main shaft stops rotating and the clamping claw is released, the sliding mechanism (32) drives the clamping mechanism (31) that clamps the material to move forward along the slide groove under the push of the elastic device (5) to deliver the material to be processed.

2. The pneumatic automatic feeding device for a CNC lathe according to claim 1 is characterized in that: A longitudinal through hole is machined on the flange of the spindle connection device (1), and the spindle connection device (1) is fixed to the spindle of the lathe by a threaded connection piece passing through the longitudinal through hole on the flange.

3. The pneumatic automatic feeding device for a CNC lathe according to claim 1 is characterized in that: The inner cavity of the main shaft connection device (1) is provided with N sliding grooves (11), where N is greater than or equal to 2.

4. The pneumatic automatic feeding device for a CNC lathe according to claim 1, characterized in that: A groove is machined on the inner wall of the split-petal conical horn structure at the front end of the clamping mechanism (31), and an elastic pad (311) is embedded and bonded in the groove.

5. The pneumatic automatic feeding device for a CNC lathe according to claim 1, characterized in that: The sliding mechanism (32) is a stepped shaft structure, with a front end being a small end fixedly connected to the clamping mechanism, and a rear end being a large end fixed in the inner cavity of the main shaft connecting device (1) via a sliding block. The inner walls of the shafts at both ends are processed with internal threads, the internal threads of the front shaft cooperate with the external threads provided in the hollow shaft section at the tail of the clamping mechanism (31), and the internal threads of the rear shaft cooperate with the external threads provided at the head of the wind power device (2).

6. The pneumatic automatic feeding device for a CNC lathe according to claim 5, characterized in that: The inner wall of the small end of the sliding mechanism (32) is processed with a first thread groove, the inner wall of the large end of the step shaft is processed with a second thread groove, the outer wall of the hollow shaft section of the clamping mechanism (31) is processed with a third thread groove, and the outer wall of the front end of the hollow shaft body of the wind power device (2) is processed with a fourth thread groove. The first thread groove and the third thread groove are combined to form a complete first threaded hole, and the first threaded hole cooperates with the first locking mechanism (33) for circumferentially locking the clamping mechanism (31) and the sliding mechanism (32); the second thread groove and the fourth thread groove are combined to form a complete second threaded hole, and the first threaded hole cooperates with the second locking mechanism (34) for circumferentially locking the wind power device (2) and clamping the sliding device (3).

7. The pneumatic automatic feeding device for a CNC lathe according to claim 1, characterized in that: The sliding mechanism (32) is processed with a threaded through hole, and a limiting device (4) is inserted into the threaded through hole. The end of the limiting device (4) corresponds to the bottom plate frame of the main shaft connecting device (1). The length of the limiting device (4) entering the inner cavity of the main shaft connecting device (1) is not less than the length of the inner cavity slide groove of the main shaft connecting device (1), and is used to adjust the sliding distance of the clamping sliding device (3) to realize the transportation of materials of different lengths.

8. The pneumatic automatic feeding device for a CNC lathe according to claim 1, characterized in that: The elastic device (5) is a spring, and its natural length is sufficient to be accommodated in the space enclosed by the main shaft connecting device (1) and the clamping sliding device (3).

9. A method for automatic pneumatic feeding of a CNC lathe, characterized in that: The pneumatic automatic feeding device for a CNC lathe according to any one of claims 1 to 8 comprises the following steps: placing the elastic device in the inner cavity of the main shaft connecting device; Clamp the material with the clamping slide device and extend it into the slide groove in the inner cavity of the spindle connecting device; The wind device is fixedly connected to the clamping sliding device; The spindle connection device is connected and fixed to the spindle of the CNC lathe through a flange, and the clamping claws on the spindle of the CNC lathe clamp the material; Start the lathe, the CNC lathe spindle rotates to drive the wind device and the spindle connection device to rotate synchronously. Because the friction between the clamping mechanism and the material is smaller than the wind force generated by the rotation of the wind device, the wind pulls the clamping slide device to slide backward along the slide groove of the spindle connection device and presses the elastic device. The clamping slide device moves backward on the material, and the moving distance is the length of the material to be processed next time; When the processing of the upper material is completed, the spindle of the CNC lathe stops rotating, the wind-powered automatic feeding device stops rotating, the wind disappears, the CNC lathe spindle claws are released, and under the elastic force of the elastic device, the clamping sliding device slides forward along the slide groove of the spindle connecting device until the positioning table contacts the bottom plate of the spindle connecting device, automatically feeding the material to continue processing the next section of the material.

10. The method for automatic pneumatic feeding of a CNC lathe according to claim 9, characterized in that: A threaded through hole is processed on the sliding mechanism, and a limiting device is inserted into the threaded through hole so that the limiting device enters the inner cavity of the main shaft connecting device, and the length of the limiting device extending into the inner cavity of the main shaft connecting device is adjusted so that the length is not less than the length of the inner cavity slide groove of the main shaft connecting device; when the lathe is started, the wind force pulls the clamping sliding device to slide backward along the slide groove of the main shaft connecting device until the limiting device contacts the bottom plate of the main shaft connecting device, and the distance from the bottom end face of the limiting device to the bottom plate is the length of the material to be conveyed.

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