Automatic adjustable lower die structure and using method

Abstract

The invention discloses an automatic adjustable lower die structure and a using method, and relates to the technical field of machine tool die adjusting.The automatic adjustable lower die structure comprises a lower die support, and two sets of supporting bases are installed on the lower die support; the two sets of lower dies are arranged in parallel, an adjusting groove is formed in the lower die support, and a brace is installed in the adjusting groove. Two groups of supporting seats are mounted at the end part of the lower die support, and rotating gears are mounted on the supporting seats; a tooth-shaped strip is arranged at the bottom of the pull strip, and the tooth-shaped strip is meshed with the rotating gear; a driving motor is mounted outside the lower die support and is suitable for driving the two groups of rotating gears to rotate; and the two groups of supporting seats which are arranged in parallel are suitable for moving towards or away from each other along with the transverse movement of the brace. The technical problem that in the prior art, due to the fact that the end of a lower die support directly pulls a supporting structure, deflection lag is caused due to the fact that the length is too long is solved.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool mold adjustment, and in particular to an automatically adjustable lower mold structure and a use method thereof. Background Art

[0002] The bending machine mold is a tool used by the bending machine to shape and process sheet materials. This tool is composed of various parts, and different molds are composed of different parts; it mainly realizes the processing of the shape of the object by changing the physical state of the material being formed. It is used to make the blank into a part with a specific shape and size under the pressure of the bending machine.

[0003] The upper die exerts pressure to bend the metal sheet. During the operation of the bending machine, the metal sheet is placed on the bottom die (i.e., the lower die) of the bending machine, and then the upper die is pressed down, and the pressure is used to bend the sheet along the shape of the lower die.

[0004] The function of the lower die is to guide the sheet to press down to form a folded angle. When the sheet is placed on the lower die, the upper die applies pressure to bend the sheet along the shape of the lower die. The accuracy and shape of the lower die directly affect the angle and shape of the bend. Therefore, a high-quality lower die can ensure the accuracy and consistency of the bend.

[0005] Compared with the upper die, the lower die often needs to be adjusted. Reference document CN202211692718.2 describes an automatically adjustable open roller lower die, which uses a motor-driven offset slide to drive the split-axis side plate to adjust the support spacing. Since the adjustment method is end traction, for the long strip lower die support structure, there is a problem that one end is adjusted while the other end has not yet deflected, which can easily lead to technical problems such as different results for the same batch of bending.

[0006] To this end, we provide an automatically adjustable lower die structure and a use method to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to make up for the deficiencies of the prior art and to provide an automatically adjustable lower die structure and a method of use, which overcomes the technical problem of deflection lag caused by the excessive length of the direct traction lower die support structure through the driving effect of long strips of pull rods and gear racks.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: an automatically adjustable lower die structure, comprising a lower die support, on which two groups of support seats are installed;

[0009] The two groups of support seats are provided in two groups and are parallel to each other. An adjustment groove is provided in the lower die support, and a pull rod is installed in the adjustment groove.

[0010] Two sets of support seats are installed at the end of the lower die support, and rotating gears are installed on the support seats; a toothed bar is opened at the bottom of the pull bar, and the toothed bar is meshed with the rotating gear;

[0011] A driving motor is installed outside the lower mold support, and the driving motor is suitable for driving two sets of rotating gears to rotate;

[0012] The two groups of support seats are suitable for moving towards or away from each other as the pull rod moves laterally.

[0013] In a further technical solution, the pull rods are provided with oblique grooves, and there are at least two groups of oblique grooves provided on each group of pull rods;

[0014] The bottom of the support seat extends into the adjustment groove and is provided with a connecting strip, wherein the connecting strip is suitable for being installed and sliding in the inclined strip groove.

[0015] In a further technical solution, the vertical cross-section of the oblique bar groove is a square groove; the angle between the oblique bar groove and the length direction of the pull rod is 12-15°.

[0016] In a further technical solution, the support seat is fixedly connected to the lower mold support, a steering gear is installed at the output end of the driving motor, and transmission shafts are installed on both sides of the steering gear;

[0017] The shaft of the transmission shaft is installed in the support seat, and a connecting bearing 1 is installed at both ends connected to the support seat, the inner ring of the connecting bearing 1 is fixedly connected to the transmission shaft, and the outer ring is fixedly connected to the support seat;

[0018] The transmission shaft located in the support seat is connected with the rotating gear.

[0019] In a further technical solution, a built-in groove is provided in the support seat and is suitable for the bottom of the rotating gear to pass through;

[0020] The top height of the pull rod is lower than the top height of the inner wall of the support seat.

[0021] In a further technical solution, the steering gear includes a fixed housing, a bevel gear 1 and a bevel gear 2, wherein the bevel gear 1 is connected to the output end of the drive motor; the bevel gear 2 is provided with two groups and is respectively connected to the shaft ends of the transmission shaft, and both are located in the fixed housing; a connecting bearing 2 is installed between the transmission shaft and the fixed housing;

[0022] The driving motor is suitable for driving two sets of electric transmission shafts to rotate.

[0023] In a further technical solution, guide grooves are provided in the lower mold support, and the guide grooves are arranged in pairs on both sides of the horizontal axis; a T-shaped guide block is installed in the support seat, and the end head is installed in the guide groove, and the T-shaped guide block is suitable for sliding in the guide groove.

[0024] In a further technical solution, from one end of the rotating gear meshing position toward the other end, the slotting direction of the oblique groove is an inverted figure eight shape.

[0025] In a further technical solution, shaft blocks are installed on the facing sides of the two groups of support seats.

[0026] In a further technical solution, guide rail grooves are provided on opposite sides of the two groups of tie bars, and guide holes are provided in the lower die support outside the guide rail grooves, and the guide holes are perpendicular to the tie bars;

[0027] The guide rail groove includes a horizontal portion and an inclined portion, wherein two groups of the inclined portions are provided and are located at both ends of the horizontal portion; and the inclined portions are suitable for tilting outwards;

[0028] A limit trigger is installed in the guide hole, the limit trigger includes a position rod and a fixing frame, a roller is installed at one end of the position rod opposite to the guide rail groove, and the roller is adapted to the guide rail groove;

[0029] A travel switch is installed on the fixed frame, and the travel switch is connected to the driving motor; the other end of the position rod is suitable for movably abutting on the lever of the travel switch;

[0030] A retaining ring 1 is installed in the guide hole, a retaining ring 2 is installed on the position rod, and a position spring is installed between the retaining ring 1 and the retaining ring 2. One end of the position spring is fixedly connected to the retaining ring 1, and the other end is fixedly connected to the retaining ring 2. The position spring is sleeved on the position rod.

[0031] A method for using an automatically adjustable lower die structure comprises the following steps:

[0032] Step 1, turn on the drive motor switch, the output end of the drive motor rotates, and drives the two sets of transmission shafts of the steering gear to rotate;

[0033] Step 2, inside the steering gear, the output end of the driving motor drives the bevel gear 1 to rotate, and the bevel gear 1 meshes with two sets of bevel gears 2 on the working surface relative to the lower die support, driving the two sets of bevel gears 2 to rotate; the bevel gear 2 is coaxially arranged with the transmission shaft, and is respectively connected to the steering gear and the support seat through the connecting bearing 2 and the connecting bearing 1;

[0034] Step 3, the rotating gear on the transmission shaft rotates with the transmission shaft; the rotating gear meshes with the toothed bar, and the toothed bar has teeth downwardly; the pull bar is driven to slide along the adjustment groove;

[0035] Step 4: The inclined groove on the upper part of the pull rod causes the supporting seat connected thereto to slide along the inclined groove. Due to the inclination of the inclined groove, the two groups of supporting seats move relative to or away from each other;

[0036] Step 5, a guide hole is opened in the lower mold support on one side, and the guide hole passes through the support adjustment groove; the guide hole is a stepped hole, and the diameter is larger outside and smaller inside;

[0037] In the non-limited position range, the drive motor operates normally and the roller is located in the horizontal part of the guide groove;

[0038] When in the limit interval, the roller is located in the inclined portion of the guide rail groove. Since the inclined portion is inclined outward, the end of the position rod is squeezed and moves outward, driving the other end of the position rod to move outward to abut against the lever of the travel switch. The lever is pressed and rotated, triggering the travel switch, so that the circuit connected to the travel switch controls the drive motor to stop and turn.

[0039] Step 6, in step 5, a closing opening is provided at the guide hole on the position rod, and the first retaining ring is fixedly connected to the corresponding closing opening, and the second retaining ring is movably connected to the corresponding closing opening;

[0040] Step 7, after completing a single pulling action, when the driving motor is controlled again, the pulling rod moves in the reverse direction.

[0041] Compared with the prior art, this automatic adjustable lower die structure has the following beneficial effects:

[0042] The present invention drives the rotating gear to rotate by a driving motor, and then the rotating gear meshes with the toothed bar to realize the movement of the pull rod in the lower mold support; then the connecting bar at the bottom of the support seat is driven by the inclined bar groove at the top of the pull rod, and slides along the inclined bar groove to realize the horizontal approach or separation of the two groups of support seats, thereby realizing the adjustment of the distance between the support seats within a set range.

[0043] The present invention realizes the connection transmission effect from the drive motor, bevel gear one, bevel gear two, transmission shaft, rotating gear, and toothed bar through the transmission effect of the bevel gear. Through the transmission connection structure in this embodiment, a stable transmission effect can be achieved.

[0044] The present invention realizes a stable guiding function by installing a T-shaped guide block in a guide groove, thereby ensuring the certainty of the moving direction of the support seat.

[0045] The present invention opens a guide rail groove on the pull rod, and completes the working trigger effect of the limit trigger member through the normal movement of the pull rod, realizes the abutment position rod through the inclined portion of the guide rail groove, and drives it to abut on the travel switch, thereby forming an effect of automatically controlling the reverse rotation of the driving motor, avoiding the situation where the toothed bar is separated from the rotating gear, and having better practical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A top view of the automatically adjustable lower mold structure of Example 1 of the present invention;

[0047] Figure 2 It is a sectional top view of the automatic adjustable lower mold structure of the present invention;

[0048] Figure 3 A side view of the present invention located on a support seat;

[0049] Figure 4 It is a structural schematic diagram of the brace of the present invention;

[0050] Figure 5 Schematic diagram of two groups of pull rods of the present invention.

[0051] Figure 6 is a cross-sectional view of a support base according to Embodiment 2 of the present invention;

[0052] Figure 7 for Figure 6 A magnified image of point A;

[0053] Figure 8 It is a schematic diagram of a horizontal cross-sectional view of the steering gear in the present invention;

[0054] Fig. 9 It is a side cross-sectional schematic diagram of the T-shaped guide block of Example 3 of the present invention;

[0055] Fig.10 It is a sectional top view of the automatically adjustable lower mold structure of Example 4 of the present invention;

[0056] Fig.11 for Fig.10 A magnified view of part B;

[0057] Fig.12 It is a structural schematic diagram of the fixing frame of the present invention;

[0058] Fig.13 It is a schematic diagram of the position rod of the present invention triggering the travel switch when it is at the inclined surface;

[0059] In the figure:

[0060] 1. Lower die support; 2. Shaft block; 3. Pull bar; 4. Support seat; 5. Rotating gear; 6. Limit trigger; 7. Drive motor; 8. Steering gear; 9. Support seat; 11. Guide groove; 12. T-type guide block; 13. Guide hole; 31. Oblique bar groove; 32. Toothed bar; 33. Guide rail groove; 41. Connecting bearing 1; 42. Built-in groove; 61. Position rod; 62. Fixed frame; 63. Roller; 64. Travel switch; 65. Retaining ring 1; 66. Retaining ring 2; 67. Position spring; 81. Transmission shaft; 82. Connecting bearing 2; 83. Fixed shell; 84. Bevel gear 1; 85. Bevel gear 2; 91. Connecting bar; 331. Horizontal part; 332. Inclined part. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] Example 1

[0063] See also Figure 1-5 , the present invention provides a technical solution, which includes an automatically adjustable lower mold structure, including a lower mold support 1, two groups of support seats 9 are installed on the lower mold support 1, and shaft blocks 2 are installed on the support seats 9; two groups of shaft blocks 2 are arranged in parallel, and an adjustment groove is opened in the lower mold support 1, and a pull rod 3 is installed in the adjustment groove; the shaft block 2 moves relative to or away from the support seat to achieve a mold bearing effect.

[0064] like Figure 3 As shown, two groups of support seats 4 are installed at the end of the lower die support 1, and a rotating gear 5 is installed on the support seat 4; a toothed bar 32 is provided at the bottom of the pull rod 3, and the toothed bar 32 meshes with the rotating gear 5; a driving motor 7 is installed outside the lower die support 1, and the driving motor 7 is suitable for driving the two groups of rotating gears 5 to rotate; the driving motor drives the rotating gear to rotate, and then the rotating gear meshes with the toothed bar to realize the movement of the pull rod in the lower die support. Then the support seat is driven by the inclined bar groove at the top of the pull rod, and the pull rod is moved to the lower die support. Figure 3 The level in the mold moves closer or further away, thereby achieving effective connection of the lower mold support.

[0065] The two sets of parallel shaft blocks 2 are suitable for moving towards or away from each other as the pull rod 3 moves laterally.

[0066] like Figure 4As shown, the pull rod 3 is provided with an oblique groove 31, and each group of pull rods 3 is provided with at least two groups of oblique grooves 31; this embodiment uses three groups of oblique grooves 31. In this embodiment, the driving motor drives the two groups of rotating gears to rotate, which can be achieved by using a structure such as a dual-axis motor.

[0067] The bottom of the shaft block 2 extends into the adjustment groove and is installed with a connecting bar 91, which is suitable for sliding in the inclined bar groove 31. The length of the connecting bar 91 is not shown in the figure, and can be limited to 1 / 4 of the length of the inclined bar groove to ensure the supporting effect. The vertical section of the inclined bar groove 31 is a square groove. Figure 5 As shown, from one end of the meshing point of the rotating gear 5 toward the other end, the slotting direction of the bevel groove 31 is an inverted figure eight shape, and the angle between the single-sided bevel groove 31 and the length direction of the pull bar 3 is 12-15°. By sliding on the bevel groove, the two groups of support seats can move closer or farther away.

[0068] Example 2

[0069] like Figure 6-8 As shown, it is another embodiment of the present invention. On the basis of Example 1, in order to achieve a stable transmission effect, further, the support seat 4 is fixedly connected with the lower mold support 1, a steering gear 8 is installed at the output end of the drive motor 7, and a transmission shaft 81 is installed on both sides of the steering gear 8; the shaft of the transmission shaft 81 is installed in the support seat 4, and a connecting bearing 41 is installed at both ends connected to the support seat 4, the inner ring of the connecting bearing 41 is fixedly connected with the transmission shaft 81, and the outer ring is fixedly connected with the support seat 4; the transmission shaft 81 located in the support seat 4 is connected with the rotating gear 5. A built-in groove 42 is provided in the support seat 4, and is suitable for the bottom of the rotating gear 5 to pass through; the top height of the pull rod 3 is lower than the top height of the inner wall of the support seat 4.

[0070] like Figure 7 and Figure 8 As shown, the steering gear 8 includes a fixed shell 83, a bevel gear 1 84 and a bevel gear 2 85, wherein the bevel gear 1 84 is connected to the output end of the drive motor 7; the bevel gear 2 85 is provided with two groups and respectively connected to the shaft ends of the transmission shaft 81, and both are located in the fixed shell 83; a connecting bearing 2 82 is installed between the transmission shaft 81 and the fixed shell 83; the drive motor 7 is suitable for driving the two groups of electric transmission shafts 81 to rotate. The drive motor can be a reduction motor, and the transmission effect of the bevel gear is used to achieve the connection transmission effect from the drive motor, bevel gear 1, bevel gear 2, transmission shaft, rotating gear, and toothed bar. Through the transmission connection structure in this embodiment, a stable transmission effect can be achieved.

[0071] Example 3

[0072] like Fig. 9As shown, another implementation scheme of the present invention is shown. On the basis of Example 1, in order to ensure the certainty of the moving direction of the support seat, a guide groove 11 is provided in the support seat 9, and the guide grooves 11 are provided in pairs on both sides of the horizontal axis; a T-shaped guide block 12 is installed at the bottom of the shaft block 2, and the end is installed in the guide groove 11, and the T-shaped guide block 12 is suitable for sliding in the guide groove 11.

[0073] Working principle: When it is needed, the steering gear is driven by the driving motor to rotate the two sets of transmission shafts, thereby realizing the rotation of the rotating gear on the transmission shaft. The rotating gear drives the toothed bar under the pull bar to realize the movement effect of the inclined bar groove on the pull bar, and the connecting bar installed under the support seat realizes the passive sliding effect; thereby realizing the relative or opposite movement of the two sets of support seats.

[0074] Example 4

[0075] like Figure 10-13 As shown, another embodiment of the present invention is based on Example 1, combined with Fig.10 From the perspective of FIG. 1 , guide grooves 33 are provided on opposite sides of the two groups of pull bars 3 , and guide holes 13 are provided in the lower mold support 1 outside the guide grooves 33 , and the guide holes 13 are perpendicular to the pull bars 3 ; the groove diameter of the guide grooves does not affect the setting of the toothed bars 32 .

[0076] The guide groove 33 includes a horizontal portion 331 and an inclined portion 332. The inclined portion 332 is provided in two groups and is located at both ends of the horizontal portion 331; and the inclined portion 332 is suitable for tilting outward; the specific corresponding travel switch installation position and the inclined portion should be adapted, that is, the lever effect of the position rod squeezing the travel switch is completed in the inclined portion without damaging the travel switch. Fig.10 The direction of the arrow is the direction of the starting pull rod.

[0077] See also Figure 11-13 A limit trigger 6 is installed in the guide hole 13. The limit trigger 6 includes a position rod 61 and a fixing frame 62. A roller 63 is installed at one end of the position rod 61 opposite to the guide groove 33. The roller 63 is adapted to the guide groove 33. A travel switch 64 is installed on the fixing frame 62. The travel switch 64 is connected to the drive motor 7. The other end of the position rod 61 is suitable for movably abutting against the lever of the travel switch 64. The lever is the trigger rod of the travel switch, that is, the control effect of the travel switch is achieved by squeezing the lever. A retaining ring 1 65 is installed in the guide hole 13. A retaining ring 2 66 is installed on the position rod 61. A position spring 67 is installed between the retaining ring 1 65 and the retaining ring 2 66. One end of the position spring 67 is fixedly connected to the retaining ring 1 65 and the other end is fixedly connected to the retaining ring 2 66. The position spring 67 is sleeved on the position rod 61.

[0078] A method for using an automatically adjustable lower die structure comprises the following steps:

[0079] Step 1, turn on the switch of the driving motor 7, the output end of the driving motor 7 rotates, and drives the steering gear 8 to output two sets of transmission shafts 81 to rotate;

[0080] Step 2, inside the steering gear 8, the output end of the driving motor 7 drives the bevel gear 1 84 to rotate, and the bevel gear 1 84 meshes with two sets of bevel gears 2 85 on the working surface relative to the lower die support 1, driving the two sets of bevel gears 2 85 to rotate; the bevel gear 2 85 is coaxially arranged with the transmission shaft 81, and is respectively connected to the steering gear 8 and the support seat 4 through the connecting bearing 2 82 and the connecting bearing 1 41;

[0081] Step 3, the rotating gear 5 on the transmission shaft 81 rotates with the transmission shaft 81; the rotating gear 5 engages with the toothed bar 32, and the toothed bar 32 opens a tooth shape downward; driving the pull bar 3 to slide along the adjustment groove;

[0082] Step 4: The inclined groove 31 on the upper part of the pull bar 3 causes the support seat 9 connected thereto to slide along the inclined groove 31. Due to the inclination of the inclined groove 31, the two groups of support seats 9 move relative to or away from each other;

[0083] Step 5: A guide hole 13 is opened in the lower mold support 1 on one side, and the guide hole 13 passes through the support adjustment groove; the guide hole 13 is a stepped hole, and the diameter is larger outside and smaller inside;

[0084] In the non-limiting position interval, the driving motor 7 operates normally, and the roller 63 is located in the horizontal portion 331 in the guide groove 33;

[0085] When in the limit interval, the roller 63 is located in the inclined portion 332 of the guide groove 33. Since the inclined portion 332 is inclined outward, the end of the position rod 61 is squeezed and moves outward, driving the other end of the position rod 61 to move outward to abut against the lever of the travel switch 64. The lever is pressed and rotated, triggering the travel switch 64, so that the circuit connected to the travel switch 64 controls the drive motor 7 to stop and turn.

[0086] Step 6, in step 5, a closing mouth is provided at the guide hole 13 on the position rod 61, and the retaining ring 1 65 is fixedly connected to the corresponding closing mouth, and the retaining ring 2 66 is movably connected to the corresponding closing mouth; the closing mouth can be integrally provided with the lower die support 1, or the shrinkage of the aperture can be completed by welding, and the adoption method is not unique;

[0087] Step 7, complete a single pull rod 3 action, and when the drive motor 7 is controlled again, the pull rod 3 moves in the opposite direction, that is, the subsequent pull rod direction is opposite to step 3, and extrusion occurs when the roller reaches the inclined portion, and then the driving motor steering limit function is completed.

[0088] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. An automatically adjustable lower die structure, characterized in that: It comprises a lower die support (1), on which two groups of support seats (9) are installed; The two groups of support seats (9) are arranged in parallel, and an adjustment groove is opened in the lower mold support (1), and a pull rod (3) is installed in the adjustment groove; Two groups of support seats (4) are installed at the end of the lower die support (1), and a rotating gear (5) is installed on the support seat (4); a toothed bar (32) is provided at the bottom of the pull bar (3), and the toothed bar (32) is meshed with the rotating gear (5); A driving motor (7) is installed outside the lower die support (1), and the driving motor (7) is suitable for driving the two sets of rotating gears (5) to rotate; The two groups of support seats (9) are suitable for moving towards or away from each other as the pull rod (3) moves laterally.

2. The automatic adjustable lower mold structure according to claim 1, characterized in that: The pull bars (3) are provided with oblique grooves (31), and each group of pull bars (3) is provided with at least two groups of oblique grooves (31); The bottom of the support seat (9) extends into the adjustment groove and is provided with a connecting strip (91), wherein the connecting strip (91) is suitable for being installed and sliding in the inclined strip groove (31).

3. The automatic adjustable lower mold structure according to claim 2, characterized in that: The vertical cross section of the oblique groove (31) is a square groove; the angle between the oblique groove (31) and the length direction of the pull rod (3) is 12-15°.

4. The automatic adjustable lower mold structure according to claim 1, characterized in that: The support seat (4) is fixedly connected to the lower die support (1); a steering gear (8) is installed at the output end of the driving motor (7), and transmission shafts (81) are installed on both sides of the steering gear (8); The shaft of the transmission shaft (81) is installed in the support seat (4), and connecting bearings (41) are installed at both ends connected to the support seat (4), the inner ring of the connecting bearing (41) is fixedly connected to the transmission shaft (81), and the outer ring is fixedly connected to the support seat (4); The transmission shaft (81) located in the support seat (4) is connected to the rotating gear (5).

5. The automatic adjustable lower die structure according to claim 4, characterized in that: The support seat (4) is provided with a built-in groove (42) suitable for the bottom of the rotating gear (5) to pass through; The top height of the pull rod (3) is lower than the top height of the inner wall of the support seat (4).

6. The automatic adjustable lower die structure according to claim 5, characterized in that: The steering gear (8) comprises a fixed housing (83), a bevel gear 1 (84) and a bevel gear 2 (85); the bevel gear 1 (84) is connected to the output end of the drive motor (7); two groups of bevel gears 2 (85) are provided and are respectively connected to the shaft ends of the transmission shaft (81), and are both located in the fixed housing (83); a connecting bearing 2 (82) is installed between the transmission shaft (81) and the fixed housing (83); The driving motor (7) is suitable for driving two sets of electric transmission shafts (81) to rotate.

7. The automatic adjustable lower mold structure according to claim 3, characterized in that: The lower die support (1) is provided with a guide groove (11), and the guide grooves (11) are arranged in pairs on both sides of the horizontal axis; a T-shaped guide block (12) is installed inside the support seat (9), and the end head is installed in the guide groove (11), and the T-shaped guide block (12) is suitable for sliding in the guide groove (11).

8. An automatically adjustable lower die structure according to any one of claims 1 to 7, characterized in that: From one end of the meshing position of the rotating gear (5) toward the other end, the slotting direction of the oblique groove (31) is an inverted figure eight shape; and a shaft block (2) is installed on the support seat (9).

9. The automatic adjustable lower die structure according to claim 8, characterized in that: A guide rail groove (33) is provided on the opposite side of the two groups of tie bars (3), and a guide hole (13) is provided in the lower mold support (1) outside the guide rail groove (33), and the guide hole (13) is perpendicular to the tie bars (3); The guide rail groove (33) comprises a horizontal portion (331) and an inclined portion (332), wherein two groups of the inclined portions (332) are provided and are located at both ends of the horizontal portion (331); and the inclined portions (332) are suitable for tilting outwards; A limit trigger member (6) is installed in the guide hole (13), the limit trigger member (6) comprising a position rod (61) and a fixing frame (62), a roller (63) is installed at one end of the position rod (61) opposite to the guide rail groove (33), and the roller (63) is adapted to the guide rail groove (33); A travel switch (64) is mounted on the fixed frame (62), and the travel switch (64) is connected to the driving motor (7); the other end of the position rod (61) is adapted to be movably abutted against the lever of the travel switch (64); A retaining ring 1 (65) is installed in the guide hole (13), a retaining ring 2 (66) is installed on the position rod (61), and a position spring (67) is installed between the retaining ring 1 (65) and the retaining ring 2 (66). One end of the position spring (67) is fixedly connected to the retaining ring 1 (65), and the other end is fixedly connected to the retaining ring 2 (66), and the position spring (67) is sleeved on the position rod (61).

10. A method for using an automatically adjustable lower die structure, characterized in that: The method comprises the automatic adjustable lower mold structure according to claim 9, further comprising the following steps: Step 1, turning on the switch of the driving motor (7), the output end of the driving motor (7) rotates, driving the steering gear (8) to output two sets of transmission shafts (81) to rotate; Step 2, inside the steering gear (8), the output end of the driving motor (7) drives the bevel gear 1 (84) to rotate, and the bevel gear 1 (84) engages with two sets of bevel gear 2 (85) on the working surface relative to the lower mold support (1), driving the two sets of bevel gear 2 (85) to rotate; the bevel gear 2 (85) is coaxially arranged with the transmission shaft (81), and is respectively connected to the steering gear (8) and the support seat (4) through the connecting bearing 2 (82) and the connecting bearing 1 (41); Step 3, the rotating gear (5) on the transmission shaft (81) rotates with the transmission shaft (81); the rotating gear (5) engages with the toothed bar (32), and the toothed bar (32) is provided with teeth downward; the pull bar (3) is driven to slide along the adjustment groove; Step 4, the inclined groove (31) on the upper part of the pull bar (3) causes the supporting seat (9) connected thereto to slide along the inclined groove (31), and due to the inclination of the inclined groove (31), the two groups of supporting seats (9) move relative to or away from each other; Step 5, a guide hole (13) is opened in the lower mold support (1) on one side, and the guide hole (13) passes through the support adjustment groove; the guide hole (13) is a stepped hole, and the diameter is larger on the outside and smaller on the inside; In the non-limiting position interval, the driving motor (7) operates normally, and the roller (63) is located in the horizontal portion (331) in the guide rail groove (33); When in the limit range, the roller (63) is located in the inclined surface (332) of the guide rail groove (33). Since the inclined surface (332) is inclined outward, the end of the position rod (61) is squeezed and moves outward; the other end of the position rod (61) is driven to move outward to contact the lever of the travel switch (64). The lever is pressed and rotated, triggering the travel switch (64), so that the circuit connected to the travel switch (64) controls the drive motor (7) to stop and turn. Step 6, in step 5, a closing opening is provided at the guide hole (13) on the position rod (61), and the first retaining ring (65) is fixedly connected to the corresponding closing opening, and the second retaining ring (66) is movably connected to the corresponding closing opening; Step 7, after completing a single pull rod (3) action, the drive motor (7) is controlled again to cause the pull rod (3) to move in the reverse direction.

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