Upper mold demolding mechanism with prolonged ejection stroke

Abstract

The utility model discloses an upper mould demoulding mechanism with prolonged ejection stroke, which comprises a mould shell, a punching rod, an ejector sleeve and an ejector pin, and is characterized in that the punching rod is fixedly arranged in a central hole of the mould shell, the lower end of the punching rod extends out of the mould shell, the upper end of the punching rod is fixed on a positioning block, the lower end of the positioning block is limited on an inner step of the mould shell, and a cushion cover is arranged at the upper end of the positioning block. The cushion cover is fixed in the mold shell; the pushing pipe is slidably arranged on the punching rod in a sleeving manner, can movably extend out of the mold shell and is in demolding fit with a product on the punching rod; an ejector rod cushion block and a push needle are arranged in the cushion sleeve in a vertically movable manner, the ejector rod cushion block is divided into an upper cushion block and a lower cushion block, a spring is arranged between the upper cushion block and the lower cushion block, the upper end of the push needle is in driving fit with the ejector rod cushion block, and the lower end of the push needle penetrates through the positioning block and is in driving fit with the push tube. Due to the arrangement of the spring, the ejection stroke of the upper die is increased, and the situation that a product cannot be separated, and a punching rod breaks due to double-material punching is avoided.

Description

Technical Field

[0001] This utility model relates to an improved invention of fastener forming mold, and more particularly to an improved invention of an upper mold demolding mechanism with an extended ejection stroke. Background Technology

[0002] In the prior art, the upper die used for fastener stretching usually has a maximum stroke to meet the demolding requirements of the product stretching depth corresponding to that stroke. However, when the maximum stroke of the equipment is 55mm and the product stretching depth is 59mm, there is a certain probability that the product will get caught on the punch and cannot be completely demolded, causing the punch to break due to double material breaking. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an upper mold demolding mechanism with extended ejection stroke.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This type of upper mold demolding mechanism with extended ejection stroke includes a mold shell, a punch, a push tube, and a push pin. The punch is fixedly disposed within the central hole of the mold shell, with its lower end extending out of the mold shell. The upper end of the punch is fixed to a positioning block, and the lower end of the positioning block is limited to a step within the mold shell. A pad is provided at the upper end of the positioning block, and the pad is fixed within the mold shell. The push tube is slidably sleeved on the punch, and the push tube can move out of the mold shell and engage with the product on the punch for demolding. An ejector block and a push pin are movable up and down within the pad. The ejector block is divided into an upper pad and a lower pad, and a spring is provided between the upper and lower pads. The upper end of the push pin engages with the ejector block, and the lower end of the push pin passes through the positioning block and engages with the push tube.

[0005] The upper pad and / or lower pad are provided with spring cavities, and the springs are disposed in the spring cavities.

[0006] The upper end of the push tube is provided with a radial flange, and the lower end of the corresponding mold shell center hole is provided with a limiting step, which is matched with the radial flange for limiting.

[0007] The positioning block is divided into a lower block and an upper block. The lower block has a positioning hole, and the upper end of the punch is the end with a larger outer diameter, which is confined in the positioning hole and is pressed by the upper block.

[0008] The pusher has three pins, which are evenly spaced along the circumference.

[0009] The beneficial effect of this utility model is that the improved upper mold ejection mechanism with extended ejection stroke increases the upper mold ejection stroke of the equipment by setting a spring in the ejector bar pad. That is, the maximum stroke of the equipment is 55mm, but the product stretching depth is 59mm. The spring increases the stroke to avoid the product getting stuck on the punch and being unable to be ejected, which would cause the punch to break due to double material breaking. Attached Figure Description

[0010] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a diagram showing the fit between the upper and lower molds of this utility model. Detailed Implementation

[0013] The accompanying drawings illustrate the structure of this utility model, and further details will be described below with reference to the drawings. In this embodiment, see the attached drawings. Figure 1-2 The extended ejection stroke upper mold demolding mechanism includes a mold shell 1, a punch 2, a push tube 3, and a push pin 4. The punch 2 is fixedly installed in the center hole of the mold shell 1, with its lower end extending out of the mold shell 1. The upper end of the punch 2 is fixed to a positioning block 5, and the lower end of the positioning block 5 is limited to a step 11 inside the mold shell 1. A pad 6 is provided on the upper end of the positioning block 5, and the pad 6 is fixed inside the mold shell 1. The push tube 3 is slidably sleeved on the punch 2, and the push tube 3 can move out of the mold shell 1 and cooperate with the product demolding on the punch 2. An ejector pad 7 and a push pin 4 are provided inside the pad 6, which can move up and down. The ejector pad 7 is divided into an upper pad 71 and a lower pad 72, and a spring 73 is provided between the upper pad 71 and the lower pad 72. The spring 73 has sufficient elasticity to meet the requirement of extended ejection stroke. The upper end of the push pin 4 is driven to cooperate with the ejector pad 7, and the lower end of the push pin 4 passes through the positioning block 5 and is driven to cooperate with the push tube 3.

[0014] In this invention, the ejector rod drives the ejector rod pad 7 to move downwards, the spring 73 is in a contracted state, the ejector rod pad 7 drives the push pin 4 to move downwards, the push pin 4 drives the push tube 3 to move downwards along the punch 2. When the equipment stroke reaches its maximum, the product is moved downwards from the punch 2. The product is in a state of not being completely detached, the friction between the product and the punch 2 decreases, and the spring 73 has sufficient elasticity to push the lower pad 72 of the ejector rod pad 7 downwards, so that the push pin 4 continues to move downwards until the push tube 3 moves into place and the product is demolded from the punch 2.

[0015] As a further improved embodiment, the upper pad 71 and / or the lower pad 72 are provided with spring cavities, and the spring 73 is disposed in the spring cavity to ensure the axial stable extension and contraction of the spring 73.

[0016] As a further improved specific implementation, the upper end of the push tube 3 is provided with a radial flange 31, and the lower end of the corresponding central hole of the mold shell 1 is provided with a limiting step 12. The limiting step 12 and the radial flange 31 limit each other to restrict the push tube 3 from leaving the mold shell 1.

[0017] As a further improved specific implementation, the positioning block 5 is divided into a lower block 51 and an upper block 52. The lower block 51 is provided with a positioning hole 53. The upper end of the punch 2 is the end with a larger outer diameter and is confined in the positioning hole 53 and is pressed by the upper block 52, which facilitates the rapid assembly of the punch 2.

[0018] As a further improved implementation, the pusher 4 is provided with three pins, which are evenly distributed along the circumference to ensure balanced and stable transmission of thrust.

[0019] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A mold release mechanism with extended ejection stroke, comprising a mold shell, a punch, a push tube, and a push pin, characterized in that: The punch is fixedly installed in the center hole of the mold shell, with its lower end extending out of the mold shell and its upper end fixed to the positioning block. The lower end of the positioning block is limited to the step inside the mold shell, and a pad is provided on the upper end of the positioning block. The pad is fixed inside the mold shell. The push tube is slidably sleeved on the punch and can extend out of the mold shell and cooperate with the product on the punch for demolding. An ejector block and a push pin are provided inside the pad that can move up and down. The ejector block is divided into an upper pad and a lower pad, and a spring is provided between the upper pad and the lower pad. The upper end of the push pin is driven to cooperate with the ejector block, and the lower end of the push pin passes through the positioning block and is driven to cooperate with the push tube.

2. The upper mold demolding mechanism with extended ejection stroke as described in claim 1, characterized in that: The upper pad and / or lower pad are provided with spring cavities, and the springs are disposed in the spring cavities.

3. The upper mold demolding mechanism with extended ejection stroke as described in claim 1, characterized in that: The upper end of the push tube is provided with a radial flange, and the lower end of the corresponding mold shell center hole is provided with a limiting step, which is matched with the radial flange for limiting.

4. The upper mold demolding mechanism with extended ejection stroke as described in claim 1, characterized in that: The positioning block is divided into a lower block and an upper block. The lower block has a positioning hole, and the upper end of the punch is the end with a larger outer diameter, which is confined in the positioning hole and is pressed by the upper block.

5. The upper mold demolding mechanism with extended ejection stroke as described in claim 1, characterized in that: The pusher has three pins, which are evenly spaced along the circumference.

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