A demoulding and anti-adhesion mechanism for a PVC urinary catheter injection molding machine

Abstract

The utility model provides a demoulding and anti-adhesion mechanism for a PVC catheter injection molding machine, which relates to the field of injection molding and demoulding, and includes an inner mold tube, an upper pressing block, a lower pressing block, and a driving mechanism adapted to the inner cavity of the catheter, wherein the straight tube section of the inner mold tube is clamped and fixed between the upper pressing block and the lower pressing block, and an opening groove that passes through inside and outside is provided on the inner mold tube along the length direction of the catheter, and a rotatable demoulding sheet is provided in the inner mold tube, and the driving mechanism can drive the demoulding sheet to rotate. The demoulding and anti-adhesion mechanism for the PVC catheter injection molding machine, when the entire mechanism is taken out of the injection outer mold, the driver is inserted from the oblique opening, and in this process, the end of the rotating rod is pushed out of the end of the inner mold tube to form a pushing force on the catheter, and at the same time, the demoulding sheet pushes against the catheter and drives it to rotate slightly, so that the catheter product and the inner mold tube are separated, which effectively prevents the factors that the catheter is adhered to the inner mold tube, reduces the number of times the operator pulls out the catheter, and improves the demoulding efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding and demoulding of urinary catheters, in particular to a demoulding and anti-adhesion mechanism for an injection molding machine of a PVC urinary catheter. Background Art

[0002] A urinary catheter is a tube that is inserted from the urethra into the human bladder to drain urine. It is made of natural rubber, silicone rubber or polyvinyl chloride (PVC). After the catheter is inserted into the bladder, there is an air bag near the tip of the catheter to fix the catheter in the bladder and prevent it from falling out. The drainage tube is connected to a urine bag to collect urine.

[0003] The inner molds of the PVC catheter injection molding machines currently in use are all in the shape of an iron block that continuously decreases toward an outer cylinder. The injection molded part is a hollow kit like a model. The entire inner mold is placed in the outer mold during production. After molding, the inner mold is removed. Due to the material properties and injection molding reasons, the product will stick to the inner mold. When removing it, you need to first use an air gun to blow on each inner mold to cool it down, and then blow towards the head end, using the strong impact force of the air gun to separate the product from the inner mold. However, even if the air gun has a strong impact, only part of the catheter can be separated. The rest needs to be forcibly pulled out by the operator wearing gloves. This series of operations is not only cumbersome, but also inefficient. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a demoulding and anti-adhesion mechanism for a PVC urinary catheter injection molding machine, which solves the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions: a demolding and anti-adhesion mechanism of a PVC catheter injection molding machine, including an inner mold tube, an upper pressing block, a lower pressing block, and a driving mechanism adapted to the inner cavity of the catheter. The straight tube section of the inner mold tube is clamped and fixed between the upper pressing block and the lower pressing block. An open groove that passes through the inner and outer sides is opened on the inner mold tube along the length direction of the catheter. A rotatable demolding sheet is arranged in the inner mold tube, and the driving mechanism can drive the demolding sheet to rotate.

[0008] Preferably, the driving mechanism includes a rotating rod, a spring, a sliding plate, a driving gear, a driven gear, and a push plate. One end of the rotating rod is connected to the driven gear, and the other end axially passes through the small head end of the inner mold tube. The push plate is pivotally connected to the end of the driven gear. The upper pressure block is provided with an oblique opening for inserting the driver, and the oblique opening corresponds to the push plate. The demolding sheet is circumferentially arranged on the rotating rod, and the sliding plate is arranged in the middle section of the rotating rod. The spring is sleeved on the rotating rod and is located between the sliding plate and the small head end of the inner mold tube. The driving gear is pivotally connected to the upper pressure block and can engage with the driven gear.

[0009] Preferably, a positioning hole is vertically opened on the straight tube section of the inner mold tube, and a positioning column for inserting into the positioning hole is vertically arranged on the lower pressing block.

[0010] Preferably, the driver is a rod-shaped structure.

[0011] Preferably, the upper pressing block is also provided with a driving motor coaxially connected to the driving gear.

[0012] (III) Beneficial effects

[0013] The utility model provides a demoulding and anti-adhesion mechanism for a PVC urinary catheter injection molding machine, which has the following beneficial effects:

[0014] 1. The demoulding and anti-adhesion mechanism of the PVC catheter injection molding machine is that when the entire mechanism is taken out of the injection outer mold, the driver is inserted from the oblique mouth. During this process, the end of the rotating rod is pushed out of the end of the inner mold tube to form a pushing force on the catheter. At the same time, the demoulding sheet pushes against the catheter and drives it to rotate slightly, so that the catheter product and the inner mold tube are separated, which effectively prevents the catheter from adhering to the inner mold tube, reduces the number of times the operator pulls out the catheter, and improves the demoulding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an axonometric drawing of the utility model;

[0016] Figure 2 This is a corresponding diagram of the driving gear and the driven gear of the utility model;

[0017] Figure 3 It is a half-section view of the inner mold tube of the utility model.

[0018] In the figure: 1 inner mold tube, 2 upper pressing block, 3 lower pressing block, 4 opening groove, 5 demoulding piece, 6 rotating rod, 7 spring, 8 sliding piece, 9 driving gear, 10 driven gear, 11 push plate, 12 positioning hole, 13 positioning column, 14 bevel. DETAILED DESCRIPTION

[0019] The utility model embodiment provides a demoulding and anti-adhesion mechanism for a PVC urinary catheter injection molding machine, such as Figure 1-3 As shown, it includes an inner mold tube 1, an upper pressing block 2, a lower pressing block 3, and a driving mechanism. The inner mold tube 1 has a shape that matches the inner cavity of the catheter, with diameters at both ends gradually changing from large to small, and a straight tube section with the same diameter is extended from one end of the large end.

[0020] The straight tube section of the inner mold tube 1 is clamped and fixed between the upper pressing block 2 and the lower pressing block 3. Figure 3 As shown, a positioning hole 12 is vertically opened on the straight tube section of the inner mold tube 1, and a positioning column 13 is vertically arranged on the lower pressing block 3 for inserting the positioning hole 12. The inner mold tube 1 is positioned by the positioning column 13 to prevent it from rotating during the demoulding process. The upper pressing block 2 and the lower pressing block 3 are connected and fixed to each other by bolts or the like.

[0021] like Figure 1 As shown, the inner mold tube 1 is provided with an opening groove 4 extending from inside to outside along the length direction of the catheter, and a rotatable demoulding piece 5 is provided inside the inner mold tube 1.

[0022] like Figure 1 As shown, there are two demoulding sheets 5, which are arranged opposite to each other. The demoulding sheets 5 are arc-shaped, and their diameters are slightly smaller than the inner diameter of the inner mold tube 1 at the end of the opening groove 4. Since the inner mold tube 1 is gradually tapered, when the demoulding sheet 5 enters the opening groove 4, its end will slightly extend out of the opening groove 4. When the demoulding sheet 5 enters the inner mold tube 1 upward, the demoulding sheet 5 is stored in the inner mold tube 1. Under normal circumstances, the demoulding sheet 5 is stored in the inner mold tube 1.

[0023] The driving mechanism can drive the demoulding sheet 5 to enter the opening groove 4 and rotate. The rotation of the demoulding sheet 5 can drive the urinary catheter to rotate, so that it is separated from the inner mold tube 1.

[0024] like Figure 2-3As shown, the driving mechanism includes a rotating rod 6, a spring 7, a sliding plate 8, a driving gear 9, a driven gear 10, and a push plate 11. One end of the rotating rod 6 is connected to the driven gear 10, and the other end axially passes through the small end of the inner mold tube 1. The push plate 11 is pivoted to the end of the driven gear 10. The diameter of the driven gear 10 is smaller than the diameter of the push plate 11. The push plate 11 is circular and attached to the inner wall of the straight tube section of the inner mold tube 1, and can slide along the length direction of the straight tube section. The upper pressing block 2 is provided with an oblique opening 14 for the driver to be inserted, and the oblique opening 14 corresponds to the push plate 11. The driver is a rod-shaped structure, and the driver can be electrically controlled by a cylinder or an electric push rod. The demoulding plate 5 is circumferentially arranged on the rotating rod 6, the sliding plate 8 is arranged in the middle section of the rotating rod 6, the spring 7 is sleeved on the rotating rod 6, and is located between the sliding plate 8 and the small end of the inner mold tube 1. The function of the sliding plate 8 is to compress the spring 7 when the rotating rod 6 moves. The driving gear 9 is pivotally connected to the upper pressing block 2 and can mesh with the driven gear 10. The upper pressing block 2 is also provided with a driving motor coaxially connected to the driving gear 9. Normally, the driving gear 9 and the driven gear 10 are not in contact, and the driver pushes the push plate 11 and the driven gear 10 to move toward the driving gear 9, and finally the driven gear 10 and the driving gear 9 are meshed.

[0025] Working principle: When the whole mechanism is taken out from the injection outer mold, the product will be wrapped around a section of the inner mold tube 1 located in the middle of the opening groove 4. Insert the driver from the bevel 14, and then the driver drives the driven gear 10 to move toward the driving gear 9. During the movement, the rotating rod 6 and the compression spring 7 are synchronously pushed. In this process, the end of the rotating rod 6 is pushed out of the end of the inner mold tube 1 to form a push force on the catheter. At the same time, the demolding sheet 5 enters the opening groove 4, and the driven gear 10 meshes with the driving gear 9, so that the driven gear 10 rotates with it, and the rotating rod 6 and the demolding sheet 5 rotate in conjunction. The demolding sheet 5 pushes against the catheter and drives it to rotate slightly, so that the catheter product and the inner mold tube 1 are separated. After use, pull out the driver, and the sliding sheet 8, the rotating rod 6, the driven gear 10 and other components are restored to their original state under the action of the spring 7.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A demoulding and anti-adhesion mechanism for a PVC urinary catheter injection molding machine, characterized in that: The invention comprises an inner mold tube (1) adapted to the inner cavity of a urinary catheter, an upper pressing block (2), a lower pressing block (3), and a driving mechanism. The straight tube section of the inner mold tube (1) is clamped and fixed between the upper pressing block (2) and the lower pressing block (3). An opening groove (4) which passes through the inner mold tube (1) is provided along the length direction of the urinary catheter. A rotatable demoulding sheet (5) is provided in the inner mold tube (1). The driving mechanism can drive the demoulding sheet (5) to rotate.

2. A demoulding and anti-adhesion mechanism for a PVC urinary catheter injection molding machine according to claim 1, characterized in that: The driving mechanism comprises a rotating rod (6), a spring (7), a sliding plate (8), a driving gear (9), a driven gear (10), and a push plate (11). One end of the rotating rod (6) is connected to the driven gear (10), and the other end axially passes through the small end of the inner mold tube (1). The push plate (11) is pivotally connected to the end of the driven gear (10). The upper pressing block (2) is provided with an oblique opening (14) for inserting the driver, and the oblique opening (14) corresponds to the push plate (11). The demoulding sheet (5) is circumferentially arranged on the rotating rod (6). The sliding plate (8) is arranged in the middle section of the rotating rod (6). The spring (7) is sleeved on the rotating rod (6) and is located between the sliding plate (8) and the small end of the inner mold tube (1). The driving gear (9) is pivotally connected to the upper pressing block (2) and can mesh with the driven gear (10).

3. A demoulding and anti-adhesion mechanism for a PVC urinary catheter injection molding machine according to claim 1, characterized in that: A positioning hole (12) is vertically provided on the straight tube section of the inner mold tube (1), and a positioning column (13) for inserting the positioning hole (12) is vertically provided on the lower pressing block (3).

4. A demoulding and anti-adhesion mechanism for a PVC urinary catheter injection molding machine according to claim 2, characterized in that: The driver is a rod-shaped structure.

5. A demoulding and anti-adhesion mechanism for a PVC urinary catheter injection molding machine according to claim 2, characterized in that: The upper pressing block (2) is also provided with a driving motor coaxially connected to the driving gear (9).

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