A casing pre-pressing device for a throttle cable elbow

Abstract

The present invention belongs to the technical field of plastic elbow processing, and relates to a pre-pressing device for sleeves of throttle cable elbows, which comprises a conveyor belt device (1) and a frame structure (2) installed on the conveyor belt device (1). Overpressure cylinders (3) are symmetrically arranged on the frame structure (2), and the two overpressure cylinders (3) are connected to an upper die (4). An elastic support and guiding structure (5) is installed in the middle of the upper die (4), and bending structures (6) are symmetrically arranged on both sides of the upper die (4). The bending structure (6) comprises a sliding component (7), a rotating component (8) and a clamping and guiding component (9). The clamping and guiding component (9) comprises an upper guiding body (10) and a lower guiding body (11), and arc-shaped guiding plates (13) are symmetrically connected to the upper guiding body (10) and the lower guiding body (11) through springs (12). The pre-pressing device for sleeves of throttle cable elbows of the present invention can achieve smooth bending of the sleeves, avoid stress concentration, and can achieve automatic demoulding at the same time.

Description

Technical Field

[0001] The present invention belongs to the technical field of plastic bent pipe processing, and relates to a sleeve pre-pressing device for throttle cable bent pipes. Background Art

[0002] When producing throttle cable bent pipes, a plastic pipe liner needs to be sleeved inside the bent pipe. Since the throttle cable bent pipe has a certain curvature, when directly sleeving the plastic pipe liner, the plastic pipe liner needs to be pre-pressed into a curvature matching that of the throttle cable bent pipe.

[0003] Currently, a bending device is usually used to bend the plastic inner liner tube. For example, a sleeve pre-pressing device for throttle cable bent pipes disclosed in Patent CN213564336U is provided with a fixed block having an arc surface and a sliding block also having an arc surface. The plastic pipe is placed between the sliding block and the fixed block, and the plastic pipe is pushed by the movement of the sliding block, and the bending of the plastic pipe is achieved by using the two arc surfaces. In this way, there is no guidance and limitation during the bending process, the product yield is low, and the extrusion process is likely to cause damage to the plastic pipe.

[0004] To improve the smoothness during the bending of the plastic pipe and ensure the final bending effect, bending equipment with a fixed guiding structure has emerged. For example, a plastic conduit bending device disclosed in CN113561456B is provided with a preheating structure to preheat the plastic pipe first for smooth bending operation. When bending the pipe, the plastic pipe is first clamped and fixed from both ends by a fixing structure, and a bending member provided in the middle is used for bending. In this way, although the stability of the bending operation can be improved, during the bending process of the plastic pipe, since both ends of the plastic pipe are clamped and fixed, stress concentration is likely to occur at the clamped and fixed parts in the middle and at both ends of the bent pipe, thereby causing damage to the plastic pipe. In addition, after bending the pipe using the bending die in the above method, the bent pipe adheres to the die (especially when the plastic pipe is preheated before bending), and it is not convenient to demold. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and provide a sleeve pre-pressing device for throttle cable bent pipes.

[0006] To achieve the above purpose, the present invention provides a sleeve pre-pressing device for throttle cable bent pipes, which includes a conveyor belt device and a frame structure installed on the conveyor belt device. Overpressure cylinders are symmetrically arranged on the frame structure. Two of the overpressure cylinders are connected to an upper die. An elastic support guiding structure is installed in the middle of the upper die. Bending structures are symmetrically arranged on both sides of the upper die. The bending structure includes a sliding component, a rotating component, and a clamping and guiding component. The clamping and guiding component includes an upper guiding body and a lower guiding body. Both the upper guiding body and the lower guiding body are connected to an arc-shaped guiding plate through springs.

[0007] Further, connecting ears are symmetrically arranged at both ends of the upper mold, and the connecting ears are fixedly connected to the overpressure cylinder.

[0008] Further, the upper mold has a mold groove, an arc-shaped limiting groove is arranged in the middle of the mold groove, a receiving groove is arranged in the arc-shaped limiting groove, and a through hole is arranged at the bottom of the receiving groove to penetrate the upper mold.

[0009] Further, the elastic support and guiding structure includes a movable rod arranged through the through hole, a fixed block is connected to the lower end of the movable rod, an arc-shaped support plate is connected to the lower side of the fixed block, and a torsion spring structure is connected between the fixed block and the arc-shaped support plate.

[0010] Further, a limiting seat is fixedly connected to the upper mold, and a through hole is arranged in the middle of the limiting seat for the movable rod to pass through;

[0011] A pressure ring is also fixedly connected to the movable rod, the pressure ring is supported on the middle part of the upper side of the upper mold, and a return spring is arranged on the outer periphery of the part of the movable rod between the pressure ring and the limiting seat.

[0012] Further, the clamping and guiding assembly includes symmetrically arranged rotating plates, and the upper guiding body is located between the two rotating plates and fixedly connected to the two rotating plates;

[0013] The upper guiding body has an upper arc-shaped guiding groove;

[0014] Further, the lower ends of the two rotating plates are fixedly connected by a bottom plate, a lifting cylinder is arranged on the bottom plate, the lifting cylinder is fixedly connected to the lower guiding body, and the lower guiding body has a lower arc-shaped guiding groove;

[0015] Further, the sliding assembly includes a sliding connecting plate, a vertical connecting plate and a mounting plate;

[0016] The sliding connecting plate has a threaded hole and a limiting slider, the threaded hole is in threaded cooperation with a threaded rod, one end of the threaded rod extending into the sliding groove is rotatably installed in the sliding groove, and the end of the threaded rod outside the sliding groove is connected to a motor.

[0017] Further, the sliding connecting plate, the vertical connecting plate and the mounting plate are of an integrally formed structure;

[0018] The rotating assembly is a rotating motor installed on the mounting plate, the rotating shaft of the rotating motor passes through the vertical connecting plate and is fixedly connected to the rotating plate, and the rotating motor drives the rotating plate to rotate.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The sleeve pre-pressing device for the throttle cable elbow of the present invention can achieve automated operation of sleeve bending through the above settings of the upper die, elastic support and guiding structure, and bending structure. It has a high degree of automation and requires little manual intervention.

[0021] 2. The sleeve pre-pressing device for the throttle cable elbow of the present invention, through the above settings of the upper guiding bodies and lower guiding bodies on both sides and the elastic support and guiding structure in the middle, has good stability during the bending process of the sleeve, has a sliding space, and can reduce or even avoid the damage caused by stress concentration.

[0022] 3. The sleeve pre-pressing device for the throttle cable elbow of the present invention can flexibly adjust the bending arc of the upper die through the above settings of the upper die and the overpressure cylinder, which is beneficial to improving production efficiency and the yield rate of the bending arc of the product.

[0023] 4. The elastic support and guiding structure provided in the sleeve pre-pressing device for the throttle cable elbow of the present invention to reduce stress concentration and improve the bending stability is also beneficial to the demolding of the plastic pipe after bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic perspective view showing a sleeve pre-pressing device for a throttle cable elbow according to an embodiment of the present invention;

[0025] Figure 2 Schematic front view showing a sleeve pre-pressing device for a throttle cable elbow according to an embodiment of the present invention;

[0026] Figure 3 Schematic right view showing a sleeve pre-pressing device for a throttle cable elbow according to an embodiment of the present invention;

[0027] Figure 4 Schematically showing Figure 2 Enlarged view of part A in;

[0028] Figure 5 Schematically showing Figure 2 Enlarged view of part B in;

[0029] Figure 6 Schematic structural diagram showing an upper die according to an embodiment of the present invention;

[0030] Figure 7 Schematic perspective view showing a bending structure according to an embodiment of the present invention;

[0031] Figure 8 Schematic side view showing a bending structure according to an embodiment of the present invention.

[0032] The meanings represented by the reference numerals in the drawings are as follows:

[0033] 1. Conveyor belt device; 2. Frame structure; 3. Overpressure cylinder; 4. Upper mold; 5. Elastic support and guiding structure; 6. Bending structure; 7. Sliding assembly; 8. Rotating assembly; 9. Clamping and guiding assembly; 10. Upper side guide body; 11. Lower side guide body; 12. Spring; 13. Arc-shaped guide plate; 41. Connecting ear; 42. Mold groove; 43. Arc-shaped limiting groove; 44. Accommodating groove; 45. Through hole; 51. Moving rod; 52. Fixed block; 53. Arc-shaped support plate; 54. Torsion spring structure; 46. Limiting seat; 55. Pressure ring; 56. Return spring; 91. Rotating plate; 101. Upper arc-shaped guide groove; 92. Base plate; 93. Lifting cylinder; 111. Lower arc-shaped guide groove; 71. Sliding connecting plate; 72. Vertical connecting plate; 73. Mounting plate; 711. Threaded hole; 712. Limiting slider; 47. Chute; 48. Threaded rod; 49. Motor. Detailed implementation manners

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] The present invention will be described in detail below with reference to the drawings and specific implementation manners. The implementation manners cannot be elaborated one by one here, but the implementation manners of the present invention are not limited to the following implementation manners.

[0036] Combined with Figures 1 - 8 As shown, the present invention provides a pre-pressing device for a throttle cable elbow sleeve, including a conveyor belt device 1, a frame structure 2, an overpressure cylinder 3, an upper mold 4, an elastic support and guiding structure 5, and a bending structure 6.

[0037] According to an embodiment of the present invention, a conveyor belt device 1 is used to convey the plastic pipe after the bending operation backward. The frame structure 2 is fixedly installed on the support frame of the conveyor belt device 1 through bolts. The frame structure 2 includes an L-shaped connecting frame and a vertical mounting plate fixedly connected to the L-shaped connecting frame. The overpressure cylinders 3 of the present invention are symmetrically installed on the vertical mounting plate, and the upper die 4 is fixedly connected to the two overpressure cylinders 3 respectively. Specifically, connection ears 41 are symmetrically provided at both ends of the upper die 4, and the connection ears 41 are fixedly connected to the overpressure cylinders 3. With such a setting, the bending arc of the upper die 4 can be adjusted by the overpressure cylinders 3. On the one hand, it can be quickly adjusted for plastic pipes with different bending requirements, avoiding the need to replace dies with different bending degrees. In addition, another use of such a setting is that since the plastic pipe itself has a certain elasticity, during the bending process operation, there is a springback effect, that is, when bending the plastic pipe according to the bending degree of the die, the final bending degree of the plastic pipe will be smaller than that of the die. Usually, in consideration of the springback problem, the bending arc of the die is set to be slightly larger than the arc when the final plastic pipe is formed. However, the bending degree of the die is still fixed, and in actual production, it is still easy to occur that the bending arc of the plastic pipe does not meet the requirements. With the setting of the overpressure cylinders 3 in the present invention, after the plastic pipe is bent along the upper die 4, the overpressure cylinders 3 can be used to push the connection ears 41 downward, so that the bending arc of the upper die 4 is further increased, so that the bending arc of the plastic pipe meets the requirements. If the requirements are not met in one processing, the equipment of the present invention can be conveniently adjusted again.

[0038] According to an embodiment of the present invention, the upper die 4 has a die groove 42 that arches upward. An arc-shaped limiting groove 43 is provided in the middle of the die groove 42, and a receiving groove 44 is provided in the arc-shaped limiting groove 43. A through hole 45 penetrates the upper die 4 at the bottom of the receiving groove 44. The elastic support and guiding structure 5 of the present invention is installed in the middle of the upper die 4. Specifically, the elastic support and guiding structure 5 includes a movable rod 51 arranged through the through hole 45. A fixed block 52 is connected to the lower end of the movable rod 51. An arc-shaped support plate 53 is connected to the lower side of the fixed block 52. A torsion spring structure 54 is connected between the fixed block 52 and the arc-shaped support plate 53. A limiting seat 46 is fixedly connected to the upper die 4, and a through hole is provided in the middle of the limiting seat 46 for the movable rod 51 to pass through. A pressure ring 55 is also fixedly connected to the movable rod 51. The pressure ring 55 is supported on the middle of the upper side of the upper die 4. A return spring 56 is provided on the outer periphery of the part of the movable rod 51 between the pressure ring 55 and the limiting seat 46.

[0039] The sleeve pre - pressing device for the throttle cable elbow of the present invention is as follows. When the bending structure 6 applies a force to the plastic pipe from both ends of the plastic pipe, causing the plastic pipe to bend downward, the middle part of the plastic pipe moves upward and exerts a force on the arc - shaped support plate 53. Under the guiding action of the arc - shaped support plate 53, it moves upward, and the arc - shaped support plate 53 follows, causing the movable rod 51 to move upward. At this time, the pressing ring 55 moves upward and gradually compresses the return spring 56, while the fixed block 52 gradually enters the receiving groove 44 and cooperates with it. At the same time, the arc - shaped support plate 53 moves into the arc - shaped limiting groove 43. Under the limiting action of the arc - shaped limiting groove 43, the arc - shaped support plate 53 gradually bends until it is completely adapted to the arc - shaped limiting groove 43 and is located in the arc - shaped limiting groove 43. At this time, the torsion spring structure 54 is in a stretched state. When the elbow - bending operation is completed, the force of the bending structure 6 is withdrawn and moved out of the plastic pipe. At this time, under the action of the return spring 56, the movable rod 51 resets, that is, the arc - shaped support plate 53 resets downward. During this process, if the plastic elbow adheres to the upper die 4, automatic demolding can be completed under the action of the arc - shaped support plate 53, and the plastic pipe falls on the conveyor belt device 1 and continues to be conveyed forward.

[0040] Combined Figures 1 - 3 、 Figure 5 、 Figures 7 - 8 As shown in the figures, according to an embodiment of the present invention, bending structures 6 are symmetrically arranged on both sides of the upper die 4, and the bending structures 6 are used to apply bending forces from both sides of the plastic pipe. In this embodiment, the bending structure 6 includes a sliding component 7, a rotating component 8, and a clamping and guiding component 9. The clamping and guiding component 9 includes an upper - side guiding body 10 and a lower - side guiding body 11, and both the upper - side guiding body 10 and the lower - side guiding body 11 are connected with arc - shaped guiding plates 13 through springs 12.

[0041] Among them, the clamping and guiding component 9 includes symmetrically arranged rotating plates 91. The upper - side guiding body 10 is located between the two rotating plates 91 and fixedly connected to the two rotating plates 91. The upper - side guiding body 10 has an upper arc - shaped guiding groove 101. In this embodiment, the lower ends of the two rotating plates 91 are fixedly connected through a bottom plate 92. To ensure the structural strength, as Figure 7 shown, a fixed connecting plate can also be provided at the left end of the two rotating plates 91 to connect the two rotating plates 91. In this embodiment, a lifting cylinder 93 is provided on the bottom plate 92, and the lifting cylinder 93 is fixedly connected to the lower - side guiding body 11. The lower - side guiding body 11 has a lower arc - shaped guiding groove 111.

[0042] According to an embodiment of the present invention, the sliding assembly 7 includes a sliding connection plate 71, a vertical connection plate 72, and a mounting plate 73. In this embodiment, the sliding connection plate 71, the vertical connection plate 72, and the mounting plate 73 are integrally formed structures. The sliding connection plate 71 has a threaded hole 711 and a limit slider 712. A chute 47 is provided on the frame structure 2 that is matched with the sliding connection plate 71 and the limit slider 712. A threaded rod 48 is in threaded cooperation with the threaded hole 711. One end of the threaded rod 48 extending into the chute 47 is rotatably installed in the chute 47, and one end of the threaded rod 48 located outside the chute 47 is connected to a motor 49. When the motor 49 drives the threaded rod 48 to rotate, the sliding assembly 7 can be moved along the chute 47, and then the upper guide body 10 and the lower guide body 11 can be sleeved on the outer periphery of the plastic pipe to realize the clamping of the plastic pipe.

[0043] In this embodiment, the rotating assembly 8 is a rotating motor installed on the mounting plate 73. The rotating shaft of the rotating motor passes through the vertical connection plate 72 and is fixedly connected to the rotating plate 91. The rotating motor drives the rotating plate 91 to rotate. Specifically, the rotating motor has no fixed connection relationship with the vertical connection plate 72, and the rotating plate 91 also has no fixed connection relationship with the vertical connection plate 72. When the rotating motor drives the rotating plate 91 to rotate, the vertical connection plate 72 remains stationary. When the rotating plate 91 rotates, due to the above settings of the upper guide body 10 and the lower guide body 11, the upper guide body 10 and the lower guide body 11 rotate, and then a bending force is generated on the plastic pipe. Due to the settings of the spring 12 and the arc-shaped guide plate 13, when the plastic pipe is bent, both ends are not fixedly clamped, and the plastic pipe can perform a certain amount of sliding along the arc-shaped guide 13, so as to effectively avoid the damage caused by the stress concentration problem.

[0044] The working principle of the throttle cable bending pipe sleeve pre-pressing device of the present invention is as follows:

[0045] First, the feeding device is utilized. The feeding device is located behind the conveyor belt device 1 and includes a conveying slide rail, a lifting device slidably mounted on the conveying slide rail, and a feeding bracket mounted on the lifting device. After receiving the plastic pipe, the feeding bracket moves along the conveying slide rail to the lower part of the upper die 4, and then is lifted to a set height by the lifting device (the feeding device is a prior art and not shown in the figure). Then, the motor 49 operates, so that the bending structure 6 is sleeved on the outer periphery of the plastic pipe from both ends of the plastic pipe. After the bending structure 6 moves into place, the rotating assembly 8 operates, so that the rotating plate 91 rotates, applying a bending force to the plastic pipe. The middle part of the plastic pipe moves upward, pushing the movable rod 51 upward until the plastic pipe is completely fitted with the die groove 42 of the upper die 4. After maintaining for a period of time, the motor 49 reverses, so that the bending structure 6 moves outward, and the lifting cylinder 93 drives the lower guide body 11 to move downward, thereby releasing the plastic pipe. The plastic pipe falls on the conveyor belt device 1 under the action of gravity and is conveyed forward. And the movable rod 51 can be reset downward under the action of the return spring 56, so as to solve the problem that the plastic is easily adhered to the inside of the upper die 4 and is inconvenient to demold.

[0046] The above description is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A casing preloading device for a throttle cable bend, characterized in that: The invention comprises a conveyor belt device (1) and a frame structure (2) installed on the conveyor belt device (1), wherein overpressure cylinders (3) are symmetrically arranged on the frame structure (2), and the two overpressure cylinders (3) are connected to an upper mold (4). An elastic support guide structure (5) is installed in the middle of the upper mold (4), and bending structures (6) are symmetrically arranged on both sides of the upper mold (4), and the bending structure (6) comprises a sliding component (7), a rotating component (8) and a clamping guide component (9), and the clamping guide component (9) comprises an upper guide body (10) and a lower guide body (11), and the upper guide body (10) and the lower guide body (11) are both connected to an arc-shaped guide plate (13) via a spring (12); The upper mold (4) has a mold groove (42), a curved limiting groove (43) is provided in the middle of the mold groove (42), a receiving groove (44) is provided in the curved limiting groove (43), a through hole (45) is provided at the bottom of the receiving groove (44) and penetrates the upper mold (4), and the elastic support guide structure (5) includes a movable rod (51) arranged through the through hole (45), the lower end of the movable rod (51) is connected to a fixed block (52), the lower side of the fixed block (52) is connected to an curved support plate (53), and the fixed A torsion spring structure (54) is connected between the block (52) and the arc-shaped support plate (53); a limit seat (46) is fixedly connected to the upper mold (4); a through hole is provided in the middle of the limit seat (46) for the movable rod (51) to pass through; a pressure ring (55) is also fixedly connected to the movable rod (51); the pressure ring (55) is supported on the middle of the upper side surface of the upper mold (4); a return spring (56) is provided on the outer periphery of the portion of the movable rod (51) located between the pressure ring (55) and the limit seat (46); The clamping guide assembly (9) comprises symmetrically arranged rotating plates (91), an upper guide body (10) is located between the two rotating plates (91) and is fixedly connected to the two rotating plates (91), and the upper guide body (10) has an upper arc-shaped guide groove (101); The lower ends of the two rotating plates (91) are fixedly connected via a bottom plate (92). A lifting cylinder (93) is provided on the bottom plate (92). The lifting cylinder (93) is fixedly connected to a lower guide body (11). The lower guide body (11) has a lower arc-shaped guide groove (111).

2. The casing preloading device for the throttle cable bend according to claim 1, characterized in that: Connecting ears (41) are symmetrically provided at both ends of the upper mold (4), and the connecting ears (41) are fixedly connected to the overpressure cylinder (3).

3. The casing preloading device for a throttle cable bend according to claim 1, characterized in that: The sliding assembly (7) comprises a sliding connection plate (71), a vertical connection plate (72) and a mounting plate (73); The sliding connection plate (71) has a threaded hole (711) and a limiting slider (712); the frame structure (2) is provided with a slide groove (47) that matches the sliding connection plate (71) and the limiting slider (712); the threaded hole (711) is threadedly matched with a threaded rod (48); one end of the threaded rod (48) extends into the slide groove (47) and is rotatably mounted in the slide groove (47); and one end of the threaded rod (48) located outside the slide groove (47) is connected to a motor (49).

4. The casing preloading device for a throttle cable bend according to claim 3, characterized in that: The sliding connection plate (71), the vertical connection plate (72) and the mounting plate (73) are integrally formed; The rotating assembly (8) is a rotating motor mounted on the mounting plate (73); the rotating shaft of the rotating motor passes through the vertical connecting plate (72) and is fixedly connected to the rotating plate (91); the rotating motor drives the rotating plate (91) to rotate.

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