Blocking type secondary core-pulling mechanism for plastic pipe injection molding

Abstract

The utility model relates to a plastic pipe injection molding blocking type secondary core-pulling mechanism which comprises a lower template, a main sliding block, an auxiliary sliding block and an inclined guide rod, sliding guide rails are arranged on the two sides of the main sliding block and the auxiliary sliding block, the main sliding block and the auxiliary sliding block are both connected with the sliding guide rails in a sliding mode, an inner core rod is fixedly connected to the main sliding block, and an outer sleeve is fixedly connected to the interior of the auxiliary sliding block. A blocking sliding seat is connected between the main sliding block and the auxiliary sliding block on the lower die plate in a sliding mode, a spring is arranged between the blocking sliding seat and the lower die plate, a pressing plate is fixedly connected to the bottom of the main sliding block, a trapezoid-shaped groove is formed in the lower portion of the pressing plate, the blocking sliding seat is connected with the trapezoid-shaped groove in a sliding mode, and a guide column is fixedly connected to the main sliding block. The guide column is in sliding connection with the auxiliary sliding block. The core pulling mechanism has the beneficial effects that the secondary pulling can be carried out by linking the secondary sliding block through the sliding pulling of the main sliding block and the inclined guide rod in sequence and matching with the floating blocking sliding seat, so that the product damage during core pulling is avoided, and the processing quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, specifically to a blocking-type secondary core-pulling mechanism for injection molding of plastic tubes. Background Technology

[0002] Commonly used plastic pipe fittings include straight pipes and tee pipes. Injection molding is one of the main processing methods for plastic pipes. Since flow channels need to be set inside the plastic pipe, a lateral core-pulling structure needs to be set in the pipe fitting during the manufacturing process to participate in the forming of the flow channels inside the plastic pipe.

[0003] The existing core-pulling structure adopts a side-mounted one-time extraction structure. Due to the design of the inserts involved in the molding of the pipe fitting, the molding of the inner and outer walls of the pipe fitting, one-time extraction is prone to damage at the pipe opening of the plastic pipe, resulting in defective products and low processing quality. Utility Model Content

[0004] The purpose of this invention is to provide a blocking-type secondary core-pulling mechanism for plastic tube injection molding. The mechanism uses an inner core rod and an outer sleeve to participate in the molding of the plastic tube. The core can be pulled out sequentially by the sliding of the main slider and the inclined guide rod, and the floating blocking slide can be linked with the secondary slider to perform secondary extraction, thereby avoiding product damage during core pulling and improving processing quality.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a blocking-type secondary core-pulling mechanism for injection molding of plastic tubes, comprising a lower template, a main slider, a secondary slider, and an inclined guide rod. Sliding guide rails are provided on both sides of the main slider and the secondary slider, and both the main slider and the secondary slider are slidably connected to the sliding guide rails. An inner core rod is fixedly connected to the main slider, and an outer sleeve is fixedly connected to the inner slider. The inner core rod is slidably connected to the outer sleeve. A blocking slide is slidably connected to the lower template between the main slider and the secondary slider. A spring is provided between the blocking slide and the lower template. A pressure plate is fixedly connected to the bottom of the main slider, and a trapezoidal groove is provided at the lower part of the pressure plate. The blocking slide is slidably connected to the trapezoidal groove. A clearance groove is provided at the end of the main slider near the secondary slider, and the upper end of the blocking slide is located within the clearance groove and fits against the side wall of the secondary slider. A guide post is fixedly connected to the main slider, and the guide post is slidably connected to the secondary slider.

[0006] Furthermore, the main slider is provided with an oblique insertion hole, and the oblique guide rod is slidably connected to the oblique insertion hole.

[0007] Furthermore, the blocking slide has a groove in the middle, and a trapezoidal protrusion corresponding to the trapezoidal groove is provided in the groove, and the trapezoidal protrusion is slidably connected to the trapezoidal groove.

[0008] Furthermore, rectangular grooves are provided on both sides of the blocking slide, and baffles are fixedly connected to both sides of the lower template on the blocking slide.

[0009] Furthermore, the inner core rod is coaxially arranged with the outer sleeve, and the inner core rod is located inside the outer sleeve.

[0010] Furthermore, the guide post is a stepped rod, and the secondary slider has a countersunk hole, with the guide post located inside the countersunk hole.

[0011] The beneficial effects of this utility model are as follows: by using an inner core rod and an outer sleeve to participate in the molding of plastic tubes, the main slider and the inclined guide rod can be pulled out sequentially, and the floating blocking slide can be linked with the secondary slider for secondary extraction, avoiding product damage during core pulling and improving processing quality. Attached Figure Description

[0012] Figure 1 This is a first-view schematic diagram of the present invention.

[0013] Figure 2 This is a second-view schematic diagram of the present invention.

[0014] Figure 3 This is a front sectional view of the inner core rod of this utility model.

[0015] Figure 4 This is a front sectional view of the clearance groove of this utility model.

[0016] Figure 5 This is an exploded view of the present invention.

[0017] In the diagram: 1. Main slider; 101. Inner core rod; 102. Relief groove; 103. Angled insertion hole; 2. Secondary slider; 201. Outer sleeve; 3. Sliding guide rail; 4. Blocking slide; 5. Pressure plate; 501. Trapezoidal groove; 6. Spring; 7. Angled guide rod; 8. Baffle plate; 9. Guide post. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0019] refer to Figures 1-5The illustrated plastic tube injection molding blocking type secondary core-pulling mechanism includes a lower mold plate, a main slider 1, a secondary slider 2, and an inclined guide rod 7. The inclined guide rod 7 is fixed to the upper mold plate during use. During mold opening, the upper mold plate will drive the inclined guide rod 7 upwards. Sliding guide rails 3 are provided on both sides of the main slider 1 and the secondary slider 2, and both the main slider 1 and the secondary slider 2 are slidably connected to the sliding guide rails 3. The sliding guide rails 3 mainly guide and limit the core-pulling action of the main slider 1 and the secondary slider 2. An inner core rod 101 is fixedly connected to the main slider 1. After the plastic tube is molded, the inner core rod 101 is located inside the plastic tube. An outer sleeve 201 is fixedly connected inside the secondary slider 2. After the plastic tube is molded, the end of the plastic tube is located in the outer sleeve 201. Inside, the inner core rod 101 is slidably connected to the outer sleeve 201. A blocking slide 4 is slidably connected on the lower template between the main slider 1 and the auxiliary slider 2. A spring 6 is provided between the blocking slide 4 and the lower template. The spring 6 is used to reset the blocking slide 4. A pressure plate 5 is fixedly connected to the bottom of the main slider 1. A trapezoidal groove 501 is provided at the lower part of the pressure plate 5. The blocking slide 4 is slidably connected to the trapezoidal groove 501. A relief groove 102 is provided at the end of the main slider 1 near the auxiliary slider 2. During the sliding process, the pressure plate 5 will press down on the blocking slide 4 so that it loses its obstruction to the auxiliary slider 2. The upper end of the blocking slide 4 is located in the relief groove 102 and is in contact with the side wall of the auxiliary slider 2. A guide post 9 is fixedly connected to the main slider 1. The guide post 9 is slidably connected to the auxiliary slider 2.

[0020] The main slider 1 is provided with an oblique insertion hole 103. The oblique guide rod 7 is slidably connected to the oblique insertion hole 103. When the oblique guide rod 7 moves upward, it will drive the main slider 1 to slide away from the auxiliary slider 2 to perform the core pulling action.

[0021] The blocking slide 4 has a groove in the middle, and a trapezoidal protrusion corresponding to the trapezoidal groove 501 is provided in the groove. The trapezoidal protrusion is slidably connected to the trapezoidal groove 501. When the trapezoidal protrusion is located in the trapezoidal groove, the blocking slide 4 is in the floating state. At this time, the blocking slide 4 blocks the secondary slider 2 from sliding. When the trapezoidal protrusion is located outside the trapezoidal groove 501, the blocking slide 4 is in the pressing state. At this time, the blocking slide 4 loses its blocking effect on the secondary slider 2.

[0022] The blocking slide 4 has rectangular grooves on both sides, and the lower template has baffles 8 fixedly connected to both sides of the blocking slide 4. The baffles 8 can limit the upward reset stroke of the blocking slide 4.

[0023] The inner core rod 101 and the outer sleeve 201 are coaxially arranged. The inner core rod 101 is located inside the outer sleeve 201. The inner core rod 101 and the outer sleeve 201 are separate structures that participate in the plastic tube, so as to realize secondary core pulling and avoid defective products due to core pulling.

[0024] The guide post 9 is a stepped rod, and the auxiliary slider 2 has a countersunk hole. The guide post 9 is located in the countersunk hole. The guide post 9 can pull the auxiliary slider 2 to perform a secondary core pulling after the blocking slide 4 is pressed down.

[0025] The working principle of this utility model is as follows: When the mold opening action is performed, the inclined guide rod 7 first rises and drives the main slider 1 away from the auxiliary slider 2. At this time, the inner core rod 101 performs a core pulling action. During the first core pulling action, the auxiliary slider 2 is blocked by the blocking slide 4 and remains stationary. After the main slider 1 continues to slide, when the trapezoidal protrusion is outside the trapezoidal groove 501, the blocking slide 4 is pressed down into the lower mold plate by the pressure plate 5. At this time, the blocking slide 4 loses its obstruction of the auxiliary slider 2. Then the guide post 9 will pull the auxiliary slider 2 to perform a second core pulling action to complete the core pulling action of the inner core rod 101 and the outer sleeve 201.

[0026] The above embodiments are used to further illustrate the present invention, but do not limit the present invention to these specific embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be understood as being within the protection scope of the present invention.

Claims

1. A blocking-type secondary core-pulling mechanism for injection molding of plastic tubes, characterized in that: The assembly includes a lower template, a main slider (1), a secondary slider (2), and a slanted guide rod (7). Sliding guide rails (3) are provided on both sides of the main slider (1) and the secondary slider (2). Both the main slider (1) and the secondary slider (2) are slidably connected to the sliding guide rails (3). An inner core rod (101) is fixedly connected to the main slider (1). An outer sleeve (201) is fixedly connected inside the secondary slider (2). The inner core rod (101) and the outer sleeve (201) are slidably connected. A blocking slide (4) is slidably connected between the main slider (1) and the secondary slider (2) on the lower template. A spring (6) is provided between the blocking slide (4) and the lower template. A pressure plate (5) is fixedly connected to the bottom of the main slide (1). A trapezoidal groove (501) is provided at the lower part of the pressure plate (5). The blocking slide (4) is slidably connected to the trapezoidal groove (501). A relief groove (102) is provided at one end of the main slide (1) near the secondary slide (2). The upper end of the blocking slide (4) is located in the relief groove (102) and is in contact with the side wall of the secondary slide (2). A guide post (9) is fixedly connected to the main slide (1). The guide post (9) is slidably connected to the secondary slide (2).

2. The blocking-type secondary core-pulling mechanism for injection molding of plastic tubes according to claim 1, characterized in that: The main slider (1) is provided with a slanted insertion hole (103), and the slanted guide rod (7) is slidably connected to the slanted insertion hole (103).

3. The blocking-type secondary core-pulling mechanism for injection molding of plastic tubes according to claim 1, characterized in that: The blocking slide (4) has a groove in the middle, and a trapezoidal protrusion corresponding to the trapezoidal groove (501) is provided in the groove. The trapezoidal protrusion is slidably connected to the trapezoidal groove (501).

4. The blocking-type secondary core-pulling mechanism for injection molding of plastic tubes according to claim 3, characterized in that: The blocking slide (4) has rectangular grooves on both sides, and the lower template has baffles (8) fixedly connected to both sides of the blocking slide (4).

5. The blocking-type secondary core-pulling mechanism for injection molding of plastic tubes according to claim 1, characterized in that: The inner core rod (101) is coaxially arranged with the outer sleeve (201), and the inner core rod (101) is located inside the outer sleeve (201).

6. The blocking-type secondary core-pulling mechanism for injection molding of plastic tubes according to claim 1, characterized in that: The guide post (9) is a stepped rod, and the auxiliary slider (2) has a countersunk hole, with the guide post (9) located inside the countersunk hole.

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