Molding mechanism for spring bed net with splendid buckles

Abstract

The utility model discloses a forming mechanism for a spring bed net with a splendid buckle, which comprises a rack, an upper die holder and a lower die holder are arranged on the rack, two first convex dies and a first concave die are arranged at the bottom of the upper die holder, and a second concave die matched with the first convex dies and a second convex die matched with the first concave die are arranged at the top of the lower die holder; the first female die can move on the upper die base in the vertical direction, and the second female die can move on the lower die base in the vertical direction. The control assembly is used for pushing the first female die downwards and pushing the second female die upwards, so that the spring is further pressed by the first male die and the second female die as well as the first female die and the second male die; the utility model can solve the problems that the clamping position of the spring wire is fixed by the traditional male die and female die, and the traditional male die and female die cannot adapt to the fluctuation of the spring wire, so that the female die and the male die are partially not attached at the uneven position of the spring wire, and the expansion forming effect of the spring wire is influenced.

Description

Technical Field

[0001] This utility model relates to the field of bed netting forming equipment, specifically to a spring-loaded bed netting forming mechanism. Background Technology

[0002] As the core support component of a mattress, the molding quality of the spring coil directly affects the product's lifespan and comfort. During the molding process, the spring wires need to be expanded and shaped. This requires clamping the spring wires using punches and dies in the upper and lower molds. However, traditional punches and dies have fixed clamping positions for the spring wires, which cannot accommodate the fluctuations in the spring wires. This results in localized misalignment between the punch and die at uneven areas of the spring wires, affecting the effective expansion and shaping of the spring wires. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a clever spring bed mesh forming mechanism.

[0004] To achieve the above objectives, the technical solution adopted by this utility model includes:

[0005] A frame is provided with an upper mold base and a lower mold base that can be raised and lowered vertically. A conveying space is formed between the upper mold base and the lower mold base for the spring wire to pass through. The bottom of the upper mold base has two first punches and a first die, and the top of the lower mold base has a second die adapted to the first punches and a second punch adapted to the first die. The first die can move vertically on the upper mold base, and the second die can move vertically on the lower mold base. A control component is provided on the frame. When the upper mold base and the lower mold base move towards each other, causing the first punch and the second die, and the first die and the second punch to clamp the spring in the conveying space, the control component pushes the first die downward and pushes the second die upward, so that the spring is further pressed by the first punch and the second die, and the first die and the second punch.

[0006] In the preferred embodiment of the above-mentioned spring bed mesh forming mechanism, the first die is pushed downward by the first guide rod, the second die is pushed upward by the second guide rod, one end of the first guide rod extends at least partially out of the upper die seat, and one end of the second guide rod extends at least partially out of the lower die seat.

[0007] In the preferred embodiment of the above-mentioned spring bed mesh forming mechanism, the control component includes at least a first rotating rod with a first notch, a second rotating rod with a second notch, and a first drive unit for controlling the synchronous rotation of the first rotating rod and the second rotating rod; wherein, the first rotating rod and the second rotating rod are both arranged laterally in the conveying space, and the first notch of the first rotating rod is directly opposite the end of the first guide rod, and the second notch of the second rotating rod is directly opposite the end of the second guide rod; when the upper mold base and the lower mold base move towards each other to clamp the spring, the first drive unit can drive the first rotating rod and the second rotating rod to rotate, so that the first guide rod is pressed against the first rotating rod and moves toward the upper mold base to push the first die, and the second guide rod is pressed against the second rotating rod and moves toward the lower mold base to push the second die.

[0008] In the preferred technical solution of the above-mentioned Miaoerkou spring bed net forming mechanism, the first drive unit includes at least a fixing plate disposed on the side of the frame for mounting the first rotating rod and the second rotating rod, a first push rod connected to the side of the first rotating rod through a first ear plate, a second push rod connected to the side of the second rotating rod through a second ear plate, and a drive module for controlling the synchronous lifting and lowering of the first push rod and the second push rod.

[0009] In the preferred embodiment of the above-mentioned Miaoerkou spring bed mesh forming mechanism, the first push rod includes a first rod portion having a first sleeve portion and a second rod portion at least partially disposed within the first sleeve portion via a first disc spring; the second push rod includes a third rod portion having a second sleeve portion and a fourth rod portion at least partially disposed within the second sleeve portion via a second disc spring.

[0010] In the preferred embodiment of the above-mentioned Miaoerkou spring bed mesh forming mechanism, the drive module includes a drive shaft rotatably mounted on the frame, a first drive device for driving the drive shaft to rotate, a first cam and a second cam mounted on the drive shaft, wherein the bottom end of the first push rod is rotatably mounted on the first cam, and the bottom end of the second push rod is rotatably mounted on the second cam.

[0011] In the preferred embodiment of the above-mentioned Miaoerkou spring bed mesh forming mechanism, at least two guide rods are installed on the frame in the vertical direction, and the guide rods pass through the upper mold base and the lower mold base.

[0012] In the preferred embodiment of the above-mentioned Miaoerkou spring bed mesh forming mechanism, a first elastic element connected to the first concave mold is installed in the upper mold base, and a second elastic element connected to the second concave mold is installed in the lower mold base; the first elastic element is used to assist the first concave mold in resetting on the upper mold base, and the second elastic element is used to assist the second concave mold in resetting on the lower mold base.

[0013] In the preferred embodiment of the above-mentioned Miaoerkou spring bed mesh forming mechanism, a second drive unit is installed on the frame, and the second drive unit can drive the upper mold base and the lower mold base to move synchronously towards or away from each other.

[0014] The beneficial effect of this utility model is that by setting the first die cavity to slide vertically independently of the upper die base and setting the second die cavity to slide vertically independently of the lower die base, the first punch and the second die cavity, and the first die cavity and the second punch, can automatically compensate for spring wire diameter fluctuations and bending deformations. At the same time, the first disc spring and the second disc spring respectively buffer the first push rod and the second push rod to achieve overload protection for the spring wire. Attached Figure Description

[0015] Figure 1 This is the front view of the present invention;

[0016] Figure 2 Diagram showing the connection between the upper and lower mold bases Figure 1 ;

[0017] Figure 3 Diagram showing the connection between the upper and lower mold bases Figure 2 ;

[0018] Figure 4 This is a schematic diagram of the upper mold base;

[0019] Figure 5 This is a schematic diagram of the lower mold base;

[0020] Figure 6 This is a schematic diagram showing the connection between the control components and the upper and lower mold bases;

[0021] Figure 7 A schematic diagram of the control components;

[0022] Figure 8 This diagram shows the positional relationship between the upper mold base, lower mold base, and expansion molding equipment.

[0023] Figure 9 A schematic diagram of an expansion molding equipment;

[0024] Figure 10 This is a partial schematic diagram of an expansion molding equipment;

[0025] In the diagram: 1. Frame; 2. Upper mold base; 21. First punch; 22. First die; 3. Lower mold base; 31. Second punch; 32. Second die; 4. Conveying space; 5. Spring wire; 6. Control assembly; 6. First guide rod; 61. Second guide rod; 62. First rotating rod; 63. First notch; 631. Second rotating rod; 64. Second notch; 641. First drive unit; 65. Fixed plate; 651. First push rod; 652. First rod part; 6521. Second rod part; 6522. Second push rod; 653. Third rod part; 6531. Fourth rod part; 6532. Drive shaft; 654. First drive device; 655. First cam; 656. Second cam; 657. Expansion molding equipment; 7. First bearing plate; 71. Second bearing plate; 72. First swing rod; 73. Second swing rod; 74. Rod body; 75. Guide rod; 8. Second drive unit; 9. Detailed Implementation

[0026] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0027] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "front," and "rear," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] like Figures 1 to 10As shown, the spring mattress forming mechanism of this utility model includes: a frame 1, on which an upper mold base 2 and a lower mold base 3 that can be raised and lowered in the vertical direction are provided. A conveying space 4 for the spring wire 5 to pass through is formed between the upper mold base 2 and the lower mold base 3. The bottom of the upper mold base 2 has two first punches 21 and a first die 22. The top of the lower mold base 3 has a second die 32 that matches the first punches 21 and a second punch 31 that matches the first die 22. The first die 22 can be raised and lowered on the upper mold base 2. The second die 32 can move vertically on the lower die base 3; the control component 6, located on the frame 1, when the upper die base 2 and the lower die base 3 move toward each other, causing the first punch 21 and the second die 32, and the first die 22 and the second punch 31 to clamp the spring in the conveying space 4, the control component 6 pushes the first die 22 down and pushes the second die 32 up, so that the spring is further pressed by the first punch 21 and the second die 32, and the first die 22 and the second punch 31.

[0030] See Figures 1 to 3 The upper mold base 2 and the lower mold base 3 are arranged vertically from top to bottom on the frame 1. The first punch 21 installed at the bottom of the upper mold base 2 is adapted to the second die 32 installed at the top of the lower mold base 3. The first die 22 installed at the bottom of the upper mold base 2 is adapted to the second punch 31 installed at the top of the lower mold base 3. When the upper mold base 2 and the lower mold base 3 move towards each other to a predetermined position, the first punch 21 and the second die 32 can clamp the spring wire 5, and the first die 22 and the second punch 31 can clamp and fix the other side of the spring wire 5.

[0031] See Figure 2 , Figure 3 The first die 22 is configured to slide vertically relative to the upper die base 2, and the second die 32 is configured to slide vertically relative to the lower die base 3. When the first punch 21 and the second die 32, and the first die 22 and the second punch 31 clamp the spring wire 5, they are adapted according to the height of the spring wire 5. This avoids the problem of insufficient or excessive clamping force on the spring wire 5, improves the clamping and fixing effect of the spring wire 5 in this application, and facilitates the spring expansion forming equipment to expand and form the spring at the clamped position.

[0032] Specifically, when expanding and forming the spring wire 5, the spring wire 5 is first conveyed into the conveying space 4 between the upper mold base 2 and the lower mold base 3 using a conveying device. Then, the upper mold base 2 and the lower mold base 3 are controlled to move towards each other, so that the first punch 21 and the second die 32, and the first die 22 and the second punch 31 respectively clamp the top and bottom sides of the spring wire 5. When the upper mold base 2 and the lower mold base 3 move to a fixed position and are stationary, the control component 6 is activated to move the first die 22 downward relative to the upper mold base 2 and the second die 32 upward relative to the lower mold base 3, thereby achieving dynamic clamping of the spring wire 5. This avoids the problem of insufficient or excessive clamping force on the spring wire 5 due to fluctuations in the wire diameter or bending deformation. Afterward, the clamped spring part is expanded and shaped using a spring expansion and forming device 7.

[0033] In one specific embodiment, the spring expansion molding device 7 is located on both sides of the upper mold base 2 and the lower mold base 3 of the frame 1, and can extend into the conveying space 4 to expand the spring clamped by the upper mold base 2 and the lower mold base 3; the spring expansion molding device 7 includes at least a first support plate 71 and a second support plate 72, the second support plate 72 is driven by a power device to move relatively closer to or away from the first support plate 71, the first support plate 71 is fixed at the conveying space 4, and a through window is opened on the first support plate 71, in which a first swing rod 73 and a second swing rod are rotatably installed. The rod 74 and the second bearing plate 72 have a rod body 75 on the surface facing the first bearing plate 71. The rod body 75 is connected to the first swing rod 73 through the first connecting rod and to the second swing rod 74 through the second connecting rod. When the second bearing plate 72 moves toward the first bearing plate 71, the ends of the first swing rod 73 and the second swing rod 74 move away from each other to open up, thereby forming an expansion shape of the spring. It has the characteristics of convenient operation, simple structure, strong adaptability, effectively reducing labor costs, speeding up production efficiency, and has practicality.

[0034] In one or more embodiments, the first die 22 is pushed downward by the first guide rod 61, and the second die 32 is pushed upward by the second guide rod 62. One end of the first guide rod 61 extends at least partially out of the upper die holder 2, and one end of the second guide rod 62 extends at least partially out of the lower die holder 3. A first elastic element connected to the first die 22 is installed in the upper die holder 2, and a second elastic element connected to the second die 32 is installed in the lower die holder 3. The first elastic element is used to assist the first die 22 in resetting on the upper die holder 2, and the second elastic element is used to assist the second die 32 in resetting on the lower die holder 3.

[0035] See Figure 4 , Figure 5The first die 22 is at least partially disposed in the upper die base 2, and the second die 32 is at least partially disposed in the lower die base 3. The first die 22 is connected to the upper die base 2 through a first elastic element, and the second die 32 is connected to the lower die base 3 through a second elastic element. The first guide rod 61 is slidably installed in the upper die base 2, with one end extending out of the upper die base 2 and the other end able to contact the first die 22. The second guide rod 62 is movably installed in the lower die base 3, with one end extending out of the lower die base 3 and the other end contacting the second die 32. By pushing the first guide rod 61 into the upper die base 2, the first guide rod 61 pushes the first die 22 downward. By pushing the second guide rod 62 into the lower die base 3, the second guide rod 62 pushes the second die 32 upward, so as to further realize the clamping and fixing of the first punch 21 and the second die 32, and the first die 22 and the second punch 31 to the spring.

[0036] After clamping is completed, the pushing force on the first guide rod 61 and the second guide rod 62 is released. Under the action of the first elastic element, the first die 22 returns to the position of the upper die base 2. Under the action of the second elastic element, the second die 32 returns to the position of the lower die base 3, so as to clamp and fix the next segment of the spring wire 5.

[0037] In one or more embodiments, the control component 6 includes at least a first rotating rod 63 with a first notch 631, a second rotating rod 64 with a second notch 641, and a first drive unit 65 for controlling the synchronous rotation of the first rotating rod 63 and the second rotating rod 64; wherein the first rotating rod 63 and the second rotating rod 64 are both arranged laterally in the conveying space 4, and the first notch 631 of the first rotating rod 63 is directly opposite the end of the first guide rod 61, and the second notch 641 of the second rotating rod 64 is directly opposite the end of the second guide rod 62; when the upper mold base 2 and the lower mold base 3 move toward each other to clamp the spring, the first drive unit 65 can drive the first rotating rod 63 and the second rotating rod 64 to rotate, so that the first guide rod 61 is pressed against the first rotating rod 63 and moves toward the upper mold base 2 to push the first die 22, and the second guide rod 62 is pressed against the second rotating rod 64 and moves toward the lower mold base 3 to push the second die 32.

[0038] See Figure 1 , Figure 6 , Figure 7The first rotating rod 63 is rotatably mounted on the frame 1 and extends into the conveying space 4 along the conveying direction perpendicular to the spring wire 5. The second rotating rod 64 is rotatably mounted on the frame 1 and extends into the conveying space 4 along the conveying direction perpendicular to the spring wire 5. The first rotating rod 63 has a first notch 631 on the side wall of the portion extending into the conveying space 4, and the second rotating rod 64 has a second notch 641 on the side wall of the portion extending into the conveying space 4. When the upper mold base 2 and the lower mold base 3 move towards each other to clamp the spring wire 5, the first notch 631 of the first rotating rod 63 is directly opposite the first guide of the upper mold base 2. At the end of rod 61, the second notch 641 of the second rotating rod 64 is directly opposite the end of the second guide rod 62 of the lower mold base 3. Subsequently, the first drive unit 65 controls the first guide rod 61 and the second guide rod 62 to rotate synchronously, so that the end of the first guide rod 61 exits the first notch 631 of the first rotating rod 63, the first guide rod 61 moves toward the upper mold base 2 to push the first die 22 downward, so that the end of the second guide rod 62 exits the second notch 641 of the second rotating rod 64, the second guide rod 62 moves toward the lower mold base 3 to push the second die 32 upward, thereby achieving further pressing and fixing of the spring wire 5.

[0039] In one or more embodiments, the first drive unit 65 includes at least a fixing plate 651 disposed on the side of the frame 1 for mounting the first rotating rod 63 and the second rotating rod 64, a first push rod 652 connected to the side of the first rotating rod 63 via a first ear plate, a second push rod 653 connected to the side of the second rotating rod 64 via a second ear plate, and a drive module for controlling the synchronous lifting and lowering of the first push rod 652 and the second push rod 653; the drive module includes a drive shaft 654 rotatably mounted on the frame 1, a first drive device 655 for driving the drive shaft 654 to rotate, a first cam 656 and a second cam 657 mounted on the drive shaft 654, wherein the bottom end of the first push rod 652 is rotatably mounted on the first cam 656, and the bottom end of the second push rod 653 is rotatably mounted on the second cam 657.

[0040] See Figure 6 , Figure 7The first drive device 655 can be a servo motor or a rotary cylinder. The specific type of the first drive device 655 is not particularly limited, as long as it can drive the drive shaft 654 to rotate circumferentially. Specifically, the first drive device 655 controls the rotation of the drive shaft 654, causing the first cam 656 and the second cam 657 to deflect with the drive shaft 654. The first cam 656 and the second cam 657 respectively push the first push rod 652 and the second push rod 653 upwards. The first push rod 652 can drive the fixed plate 65... When the first rotating rod 63 on the 1 rotates, the second push rod 653 can drive the second rotating rod 64 on the fixed plate 651 to rotate, so that the end of the first guide rod 61 moves from the first notch 631 that abuts against the first rotating rod 63 to the side wall of the first rotating rod 63, so that the first guide rod 61 moves toward the upper mold base 2 to push the first die 22 downward, and the end of the second guide rod 62 moves from the second notch 641 that abuts against the second rotating rod 64 to the side wall of the second rotating rod 64, so that the second guide rod 62 moves toward the lower mold base 3 to push the second die 32 upward.

[0041] In one or more embodiments, the first push rod 652 includes a first rod portion 6521 having a first sleeve portion and a second rod portion 6522 at least partially disposed within the first sleeve portion via a first disc spring; the second push rod 653 includes a third rod portion 6531 having a second sleeve portion and a fourth rod portion 6532 at least partially disposed within the second sleeve portion via a second disc spring.

[0042] See Figure 6 , Figure 7 The first rod portion 6521 of the first push rod 652 is used to abut against the first cam 656, and the second rod portion 6522 is used to rotatably connect to the first rotating rod 63. The first disc spring is located inside the first sleeve portion of the first rod portion 6521. The third rod portion 6531 of the second push rod 653 is used to abut against the second cam 657, and the fourth rod portion 6532 is used to rotatably connect to the second rotating rod 64. The second disc spring is located inside the second sleeve portion of the second rod portion 6522. When the first die 22 or the second die 32 clamps the spring wire 5, in order to avoid excessive pushing of the first die 22 downward or the second die 32 downward, To address the issue of damage to the spring wire 5 caused by upward movement, the first disc spring elastically connects to the second rod portion 6522, and the second disc spring elastically connects to the fourth rod portion 6532. This ensures that once the first die 22 or the second die 32 is fully in place, even if the first rod portion 6521 of the first push rod 652 or the second rod portion 6522 of the second push rod 653 is pushed upward, the first rotating rod 63 or the second rotating rod 64 will not rotate excessively under the action of the first or second disc spring, thus preventing the first guide rod 61 from forcibly pushing into the upper die base 2 or the second guide rod 62 into the lower die base 3. This guarantees the clamping effect of this application on the spring wire 5.

[0043] In one or more embodiments, at least two guide rods 8 are mounted vertically on the frame 1, and the guide rods 8 pass through the upper mold base 2 and the lower mold base 3. See also Figure 2 This design allows the upper mold base 2 and the lower mold base 3 to move only in the vertical direction, ensuring the stability of the upper mold base 2 and the lower mold base 3 during movement.

[0044] In one or more embodiments, a second drive unit 9 is mounted on the frame 1, and the second drive unit 9 is capable of driving the upper mold base 2 and the lower mold base 3 to move synchronously towards or away from each other. See also Figure 1 The second drive unit 9 can be composed of a servo motor, a crank, and two sets of cams mounted on the crank. The servo motor controls the crank to rotate, so that the two sets of cams connected to the upper mold base 2 and the lower mold base 3 respectively can rotate, thereby realizing the movement of the upper mold base 2 and the lower mold base 3 towards or away from each other. It is understood that the specific components of the second drive unit 9 are not limited, as long as they can drive the upper mold base 2 and the lower mold base 3 to move towards or away from each other.

[0045] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A cleverly designed spring mattress forming mechanism, characterized in that, include: The frame includes an upper mold base and a lower mold base that are vertically movable, forming a conveying space between the upper and lower mold bases for a spring wire to pass through. The bottom of the upper mold base has two first punches and a first die, and the top of the lower mold base has a second die adapted to the first punches and a second punch adapted to the first die. The first die can move vertically on the upper mold base, and the second die can move vertically on the lower mold base. A control component is provided on the frame. When the upper mold base and the lower mold base move toward each other, causing the first punch and the second die, and the first die and the second punch to clamp the spring in the conveying space, the control component pushes the first die downward and pushes the second die upward, so that the spring is further pressed by the first punch and the second die, and the first die and the second punch.

2. The spring mattress forming mechanism according to claim 1, characterized in that: The first die is pushed downward by the first guide rod, and the second die is pushed upward by the second guide rod. One end of the first guide rod extends at least partially out of the upper die holder, and one end of the second guide rod extends at least partially out of the lower die holder.

3. The spring mattress forming mechanism according to claim 2, characterized in that: The control component includes at least a first rotating rod with a first notch, a second rotating rod with a second notch, and a first drive unit for controlling the first rotating rod and the second rotating rod to rotate synchronously; wherein the first rotating rod and the second rotating rod are both arranged laterally in the conveying space, and the first notch of the first rotating rod is directly opposite the end of the first guide rod, and the second notch of the second rotating rod is directly opposite the end of the second guide rod; When the upper and lower mold bases move toward each other to clamp the spring, the first drive unit can drive the first rotating rod and the second rotating rod to rotate, so that the first guide rod is pressed against the first rotating rod and moves toward the upper mold base to push the first die, and the second guide rod is pressed against the second rotating rod and moves toward the lower mold base to push the second die.

4. The spring mattress forming mechanism according to claim 3, characterized in that: The first drive unit includes at least a fixing plate disposed on the side of the frame for mounting the first rotating rod and the second rotating rod, a first push rod connected to the side of the first rotating rod via a first ear plate, a second push rod connected to the side of the second rotating rod via a second ear plate, and a drive module for controlling the synchronous lifting and lowering of the first push rod and the second push rod.

5. The spring mattress forming mechanism according to claim 4, characterized in that: The first push rod includes a first rod portion having a first sleeve portion and a second rod portion at least partially disposed within the first sleeve portion by a first disc spring; The second push rod includes a third rod portion having a second sleeve portion and a fourth rod portion at least partially disposed within the second sleeve portion via a second disc spring.

6. The spring mattress forming mechanism according to claim 4, characterized in that: The drive module includes a drive shaft rotatably mounted on the frame, a first drive device for driving the drive shaft to rotate, a first cam and a second cam mounted on the drive shaft, wherein the bottom end of the first push rod is rotatably mounted on the first cam, and the bottom end of the second push rod is rotatably mounted on the second cam.

7. The spring mattress forming mechanism according to claim 1, characterized in that: At least two guide rods are installed vertically on the frame, and the guide rods pass through the upper mold base and the lower mold base.

8. The spring mattress forming mechanism according to claim 2, characterized in that: The upper mold base is equipped with a first elastic element connected to the first die cavity, and the lower mold base is equipped with a second elastic element connected to the second die cavity; the first elastic element is used to assist the first die cavity in resetting on the upper mold base, and the second elastic element is used to assist the second die cavity in resetting on the lower mold base.

9. The spring mattress forming mechanism according to claim 1, characterized in that: A second drive unit is installed on the frame, which can drive the upper mold base and the lower mold base to move synchronously towards or away from each other.

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