Sliding block moving device and double-color injection mold

Abstract

The utility model discloses a sliding block moving device, and relates to the technical field of injection molding, when a first injection pressing block moves horizontally close to a sliding block along a first direction, a first extrusion surface extrudes the sliding block to move horizontally towards a mold cavity along a second direction, the sliding block extends into the mold cavity, and at the moment, first injection molding can be carried out; after completion, the first injection pressing block retreats, and the sliding block is still kept in the mold cavity; when the second injection pressing block moves horizontally close to the sliding block in the first direction, the second extrusion face abuts against the sliding block, the sliding block is kept in the original position, and second injection molding is conducted at the moment; at the moment, the pulling block is clamped into a pulling groove for extruding the side wall of the sliding groove under the action of the elastic piece, and when the second injection pressing block retreats, the pulling block can pull out the sliding block together with the second injection pressing block. Surface contact is kept between the pulling block and the pulling groove, the contact position is stressed more uniformly, the service life can be prolonged, and the operation stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding technical field, further relates to a slider moving device and double -color injection mold. BACKGROUND

[0002] Combination Figure 1 , Figure 2 As shown in the figure, double -color injection molding process first fills the cavity with A material, after A material is formed, opens the mold and makes A material stay in the back mold side and rotates the back mold, closes the mold to form another cavity and injects B material to make AB two kinds of materials fuse together, finally, has AB two kinds of materials on a product.

[0003] Special case of double -color injection molding process: in specific circumstances, a shot must use the slider, and the slider also participates in the second shot forming, at this time, the action process of the slider is more complex.

[0004] (1) the first shot forming process

[0005] The first shot slider is pushed into the specific position required for molding by the front mold pressing block, and the pressing block retreats after the first shot molding is completed without power driving the slider, so the slider remains stationary during the mold opening process after the first shot molding.

[0006] (2) the second shot forming process

[0007] The second shot front mold has an inclined guide column, and two elastic blocks are arranged on both sides of the inclined guide column, the elastic blocks are fixed on the slider, and the elastic blocks are constrained by two spring pins.

[0008] When molding the second shot, the inclined guide column presses the elastic block during the mold closing process until the inclined guide column is completely clamped into the slider and the elastic block is reset. Therefore, the inclined guide column will not cause the slider to move during the mold closing process.

[0009] When the second shot molding is completed, the inclined guide column is clamped into the elastic block, and during the mold opening process, the inclined guide column will drive the elastic block (the elastic block is fixed on the slider) to retreat.

[0010] The contact area between the inclined guide column and the elastic block is small (approximately linear contact), which causes serious wear of the elastic block and the inclined guide column, and the inclined guide column or the elastic block needs to be replaced frequently, and the service life is short. Since the contact between the inclined guide column and the elastic block is linear contact, the running stability is poor.

[0011] For those skilled in the art, how to improve the service life and improve the running stability is a technical problem to be solved at present. UTILITY MODEL CONTENTS

[0012] The utility model discloses a slider moving device, first injection pressure block and slider cooperation carry out first injection, second injection pressure block and slider cooperation carry out second injection, pull out the block and form surface contact when pulling in the pull groove during second injection, and the stress is more uniform at the contact position, pulls out the slider when the second injection pressure block retreats, and the specific scheme is as follows:

[0013] A slider moving device, comprising a first injection pressure block, a second injection pressure block and a slider.

[0014] The first injection pressure block is provided with a first extrusion surface, and when the first injection pressure block translates along a first direction, the first extrusion surface extrudes the slider to translate along a second direction towards a mold cavity.

[0015] The second injection pressure block is provided with a second extrusion surface for blocking the slider from returning; a pulling block and an elastic member are slidably assembled on the second injection pressure block along a third direction, and the elastic member applies an elastic force to the pulling block to make the pulling block protrude from the outer surface of the second injection pressure block.

[0016] The slider is provided with an extrusion sliding groove, and the side wall of the extrusion sliding groove is provided with a pulling groove; the extrusion sliding groove is used for sliding contact and cooperation with the first extrusion surface; the extrusion sliding groove is used for sliding contact and cooperation with the second extrusion surface, and during the process that the second extrusion surface enters the extrusion sliding groove, the extrusion sliding groove applies an extrusion force to the pulling block to make the pulling block retract and make a part of the pulling block be clamped into the pulling groove; when the second injection pressure block retracts along the first direction, the pulling block pulls out the slider along the second direction.

[0017] Optionally, the pulling block is provided with a limiting recess and a pulling protrusion, the limiting recess is used for limiting cooperation with the limiting block, and the pulling protrusion is used for being embedded into the pulling groove.

[0018] One end of the pulling protrusion is provided with a friction chamfer, and the friction chamfer is used for cooperating with the extrusion sliding groove to extrude the pulling block inward.

[0019] Optionally, the limiting recess and the pulling protrusion are respectively arranged at two parallel edges of the same side surface of the pulling block.

[0020] Optionally, the first injection pressure block is provided with two first extrusion surfaces for simultaneously extruding two sliders; the two first extrusion surfaces form a structure with a width contraction along the direction of translation of the first injection pressure block.

[0021] The second injection pressure block is provided with two second extrusion surfaces, and the two second extrusion surfaces form a structure with a width contraction along the direction of translation of the second injection pressure block; the second injection pressure block is provided with two sets of pulling blocks for simultaneously pulling out two sliders.

[0022] Optionally, two pulling blocks are arranged corresponding to one second shooting block, the elastic member is arranged between the two pulling blocks, and the two pulling blocks can be respectively embedded in two pulling grooves arranged in the extrusion sliding groove.

[0023] Optionally, a limiting block is arranged on the second shooting block, and the limiting block is used for limiting the limit position of the pulling block protruding outward.

[0024] The pulling block is provided with a containing groove, and when the two pulling blocks contact each other, the elastic member is completely embedded in the containing groove.

[0025] Optionally, the limiting block is inserted into the second shooting block from one end along the moving direction of the second shooting block.

[0026] Optionally, a guide extension block is arranged on the second shooting block, and the guide extension block is located at a side with a smaller width of the second shooting block; an extension clamping block is arranged on the guide extension block, and the extension clamping block can be clamped into the pulling groove.

[0027] The pulling block pulls the sliding block by a distance, and after the pulling block and the sliding block are separated from each other, the extension clamping block takes over to pull the sliding block.

[0028] Optionally, the extension clamping block has a width taper structure with a width gradually decreasing outward.

[0029] The thickness of the extension clamping block gradually decreases at two ends in the length direction.

[0030] The utility model also provides a double -color injection mold, including any one of the sliding block moving device above.

[0031] The utility model provides a sliding block moving device, when first shooting block is along first direction close to sliding block translation, first extrusion surface extrudes sliding block and is along second direction translation to mould cavity, and sliding block extends into mould cavity, and at this moment, first shooting injection can be carried out, and after completion, first shooting block retreats and makes sliding block still remain in mould cavity, when second shooting block is along first direction close to sliding block translation, second extrusion surface stops sliding block, and makes sliding block keep in situ, and at this moment, second shooting injection is carried out, at this moment, pulling block is clamped into the pulling groove of extrusion sliding groove side wall under the action of elastic member, and when second shooting block retreats, pulling block can pull out sliding block together. BRIEF DESCRIPTION OF DRAWINGS

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram illustrating the various states of the front and rear molds in a two-color injection molding process.

[0034] Figure 2 A schematic diagram illustrating the slider displacement process in two-color injection molding;

[0035] Figure 3 A schematic diagram showing the first injection block and slider changing from an assembled state to a separated state;

[0036] Figure 4 A schematic diagram showing the second injection block and slider changing from an assembled state to a separated state and then to an explosive state;

[0037] Figure 5 This diagram shows three positions where the second injection block approaches the slider.

[0038] Figure 6 This is a schematic diagram showing three positions where the second injection block is away from the slider;

[0039] Figure 7 A top view of the assembly of the first injection block and the slider;

[0040] Figure 8 for Figure 7 Cross-sectional view at position CC;

[0041] Figure 9 An isometric view of the two pulling blocks in action;

[0042] Figure 10 This is a top view showing the two pull blocks engaging.

[0043] The image includes:

[0044] First injection block 1, first extrusion surface 11, second injection block 2, second extrusion surface 21, pulling block 22, limiting recess 221, pulling protrusion 222, friction chamfer 223, elastic element 23, limiting block 24, guide extension block 25, extension block 251, slider 3, extrusion groove 31, pulling groove 32. Detailed Implementation

[0045] In order to make the technical personnel of the prior art better understand the technical scheme of the utility model, the utility model's sliding block moving device will be introduced in detail below in combination with the drawings and specific embodiments.

[0046] The utility model provides a kind of sliding block moving device, including first injection pressure block 1, second injection pressure block 2, sliding block 3, first injection pressure block 1 is cooperated with sliding block 3 and realizes first injection molding, second injection pressure block 2 is cooperated with sliding block 3 and realizes second injection molding.First injection pressure block 1 and second injection pressure block 2 are mutually cooperated with sliding block 3 in different stages.

[0047] In combination with Figure 3 As shown in the figure, first injection pressure block 1 is provided with first extrusion surface 11, when first injection pressure block 1 is translated along first direction, first extrusion surface 11 extrudes sliding block 3 and is translated along second direction towards mould cavity;Wherein first direction is Z axis direction, second direction is X axis direction, and third direction is Y axis direction.First injection pressure block 1 is provided with first extrusion surface 11, and first extrusion surface 11 has an angle with first direction, when first injection pressure block 1 moves along first direction, different positions of first extrusion surface 11 contact sliding block 3, thereby to sliding block exert thrust.First extrusion surface 11 can be inclined plane, or arc curved surface, these forms should be contained in the protection scope of the utility model.

[0048] Second injection pressure block 2 is provided with second extrusion surface 21, for blocking sliding block 3 back position;Second extrusion surface 21 has an angle with first direction, and the shape and size of the corresponding position of second extrusion surface 21 are consistent with the corresponding position of first extrusion surface 11, and the overall size of second extrusion surface 21 is not required to be completely consistent with the overall size of first extrusion surface 11, only the shape and size of the contact position of second extrusion surface 21 and sliding block cooperation need to keep same with first extrusion surface 11.First extrusion surface 11 can be inclined plane, or arc curved surface.

[0049] Pulling block 22 can slide and translate relative to second injection pressure block 2, and the moving direction of pulling block 22 is Figure 4 Y axis direction in it.Elastic member 23 exerts elastic force on pulling block 22, and under the driving of the elastic force of elastic member 23, partial pulling block 22 protrudes from the outer surface of second injection pressure block 2.

[0050] In combination with Figure 4 As shown in the figure, sliding block 3 is provided with extrusion sliding groove 31, and the cross section of extrusion sliding groove 31 is "concave" type, and extrusion sliding groove 31 is surrounded by three side walls;Extrusion sliding groove 31 is obliquely arranged towards, and is parallel with first extrusion surface 11 and second extrusion surface 21.Extrusion sliding groove 31 is provided with pulling groove 32, Figure 4When in the two opposite side walls are respectively provided with one pull slot 32, pull slot 32 is recessed in the groove structure of two side walls, the upper and lower end of pull slot 32 has no end face.

[0051] Combining Figure 7 、 Figure 8 As shown in FIG. 1 and FIG. 2, when the first injection is performed, the first injection pressure block 1 moves along the Z-axis direction to approach the sliding block 3, and the extrusion sliding groove 31 is in sliding contact with the first extrusion surface 11. The first injection pressure block 1 applies a pushing force to the sliding block 3 along the X-axis direction, so that the sliding block 3 moves along the X-axis direction, and the end portion of the sliding block 3 can extend into the mold cavity. When the first injection pressure block 1 moves away from the sliding block 3 along the Z-axis direction, the sliding block 3 remains in the original position.

[0052] The extrusion sliding groove 31 is used for sliding contact with the second extrusion surface 21, and combining Figure 5 As shown in FIG. 3 and FIG. 4, the second injection pressure block 2 moves along the Z-axis direction to approach the sliding block 3, and in the process that the second extrusion surface 21 enters the extrusion sliding groove 31, the surface of the extrusion sliding groove 31 applies an extrusion force to the pull block 22, so that the pull block 22 is retracted, and the pull block 22 does not block the movement of the second injection pressure block 2. Finally, a part of the pull block 22 is clamped into the pull slot 32, and the part of the pull block 22 clamped into the pull slot 32 is in surface contact with the pull slot 32. The surface contact has a larger contact area, and the pressure formed by the surface contact is smaller than that formed by the line contact. When the second injection pressure block 2 retracts along the first direction, the pull block 22 and the pull slot 32 are in surface contact, the force is transmitted through the surface contact, and the pull block 22 pulls the sliding block 3 along the second direction.

[0053] The pull block 22 and the pull slot 32 of the utility model keep surface contact, the force on the contact position is more uniform, the service life can be improved, and the operation stability can be improved.

[0054] On the basis of the above-mentioned scheme, the utility model provides a specific setting form of the pull block 22, and combining Figure 9 、 Figure 10 As shown in FIG. 5 and FIG. 6, the pull block 22 is provided with a limiting recess 221 and a pull protrusion 222. The limiting recess 221 is lower than the outer surface of the pull block 22, and the pull protrusion 222 is higher than the outer surface of the pull block 22.

[0055] Combining Figure 4 、 Figure 5 As shown in FIG. 5 and FIG. 6, the limiting recess 221 is used for limiting cooperation with the limiting block 24. When the limiting block 24 is inserted into the limiting recess 221, the limiting block 24 is in contact with the bottom surface of the limiting recess 221, the limiting block 24 blocks the pull block 22, and the limit position of the entire pull block 22 extending outward is limited. Only the pull block 22 protrudes from the surface of the second injection pressure block 2, and the outer surface of the pull block 22 is flush with or slightly lower than the surface of the second injection pressure block 2. The pull protrusion 222 is used for embedding the pull slot 32, and the surface of the pull protrusion 222 is in surface contact with the surface of the pull slot 32.

[0056] When the second injection block 2 moves close to the slider 3, the pull protrusion 222 needs to enter the pull slot 32, so a friction chamfer 223 is arranged at one end of the pull protrusion 222, which is combined with Figure 9 As shown, the friction chamfer 223 is an inclined surface arranged at one end of the pull protrusion 222, which can be a flat surface or a curved surface. When the pull protrusion 222 protrudes out of the surface of the second injection block 2, one edge of the friction chamfer 223 is flush with the surface of the second injection block 2, so that the friction chamfer 223 is used to cooperate with the extrusion sliding groove 31 to extrude the pull block 22 inward. The extrusion sliding groove 31 exerts a force on the friction chamfer 223, which can make the pull block 22 translate inwardly. When the pull protrusion 222 is opposite to the pull slot 32, the extrusion force is automatically released, the pull block 22 rebounds outwardly, and the pull protrusion 222 is automatically clamped into the pull slot 32.

[0057] As shown, Figure 9 As shown, the limiting recess 221 and the pull protrusion 222 are arranged at two parallel edges of the same side surface of the pull block 22, respectively. The middle part of the pull block 22 is an outer surface reference, the left side is protruded to form the pull protrusion 222, and the right side is recessed to form the limiting recess 221, as shown, Figure 10 As shown, a stepped structure is formed from the side view.

[0058] As shown, Figure 3 , Figure 8 The first injection block 1 is provided with two first extrusion surfaces 11. The first extrusion surface 11 forms a structure tapering in the first direction. The two first extrusion surfaces 11 are used to extrude two sliders 3 at the same time, which can be used for two mold cavity molding at the same time. The two first extrusion surfaces 11 form a structure with a width contraction in the direction of translation of the first injection block 1, Figure 8 As shown, the two first extrusion surfaces 11 are wide at the top and narrow at the bottom.

[0059] The second injection block 2 is provided with two second extrusion surfaces 21. The two second extrusion surfaces 21 form a structure with a width contraction in the direction of translation of the second injection block 2. The two second extrusion surfaces 21 can simultaneously block two sliders 3 during the second injection molding. The second injection block 2 is provided with two pull blocks 22, which are used to pull out two sliders 3 at the same time, and can simultaneously move two sliders 3 out of the mold cavity.

[0060] As shown, Figure 4 As shown, two pull blocks 22 are arranged corresponding to one second injection block 2. The two pull blocks 22 are provided with elastic members 23 therebetween. The two pull blocks 22 can be respectively embedded into two pull slots 32 arranged in the same extrusion sliding groove 31. The two pull blocks 22 simultaneously exert forces on the two opposite pull slots 32 of the slider 3, which can make the slider 3 be stressed evenly and be more smoothly moved out of the mold cavity.

[0061] In combination Figure 4 As shown in the drawings, a limiting block 24 is arranged on the second injection pressure block 2, the limiting block 24 is inserted into the second injection pressure block 2, the limiting block 24 is used to limit the limit position of the outward protrusion of the pulling block 22, the pulling block 22 is moved outward under the action of the elastic member 23, the limiting recess 221 contacts the limiting block 24, thereby limiting the limit position of the two pulling blocks 22.

[0062] The pulling block 22 is provided with a containing groove, the elastic member 23 is a spring, and the containing groove can clamp the end of the spring. When the two pulling blocks 22 contact each other, the elastic member 23 is completely sunk into the containing groove.

[0063] The limiting block 24 is inserted into the second injection pressure block 2 along the moving direction of the second injection pressure block 2 from one end, in combination Figure 4 As shown in the drawings, the upper end surface of the second injection pressure block 2 is provided with a slot for inserting the limiting block 24, and the upper end surface of the second injection pressure block 2 is not in contact with the sliding block, so that interference can be avoided.

[0064] On the basis of any of the above technical solutions and the mutual combination thereof, in combination Figure 4 , Figure 5 As shown in the drawings, a guiding extension block 25 is installed on the second injection pressure block 2, the guiding extension block 25 is located on the side with smaller width of the second injection pressure block 2, the guiding extension block 25 contacts the pulling block 22, the guiding extension block 25 is provided with an extension clamping block 251, the extension clamping block 251 protrudes from the outer surface of the second injection pressure block 2, the extension clamping block 251 can be clamped into the pulling groove 32, and the extension clamping block 251 and the pulling protruding block 222 are in the same straight line.

[0065] In combination Figure 6 As shown in the drawings, the height of the second injection pressure block 2 is greater than the height of the sliding block 3, and the height of the pulling block 22 is substantially equal to the height of the sliding block 3; during the second injection molding, the second extrusion surface 21 abuts against the sliding block 3, at this time, the pulling protruding block 222 is clamped into the pulling groove 32; when the second injection pressure block 2 is translated upward, the pulling block 22 pulls the sliding block 3 back by a distance, and the two sliding blocks 3 are close to each other; after the pulling block 22 moves upward with the second injection pressure block 2 and the sliding block 3 separates from each other, the extension clamping block 251 replaces the pulling of the sliding block 3; before the pulling block 22 separates from the sliding block 3, the extension clamping block 251 is inserted into the pulling groove 32.

[0066] In combination Figure 4 As shown in the drawings, the extension clamping block 251 has a width taper structure with gradually decreasing width outward, forming a trapezoidal shape. The thickness of the two ends of the extension clamping block 251 in the length direction gradually decreases, and the thickness is wedge-shaped. Through the above molding, the extension clamping block 251 can be more easily clamped into the pulling groove 32.

[0067] In combination Figure 5As shown, from left to right, respectively, indicate the second shooting pressure block 2 before, during, after the card into the three states of the card into the slide block 3, the second shooting pressure block 2 from top to bottom gradually close to the slide block 3, Figure 5 When the dashed line above is the top view of the corresponding A-A, A'-A', A''-A'' direction below. In the process of the second shooting pressure block 2 card into the guide extension block 25 will not interfere with the extrusion chute 31, pull slot 32.

[0068] In combination Figure 6 As shown, from left to right, respectively, indicate the second shooting pressure block 2 with the slide block 3 card, during the separation process, after the three states of the card, the second shooting pressure block 2 from bottom to top gradually away from the slide block 3, Figure 6 When the dashed line above is the top view of the corresponding B-B, B'-B', B''-B'' direction below. In the process of the second shooting pressure block 2 move out, first by the pull block 22 pull out the slide block 3 by the extension of the card block 251, then further out of the slide block 3, the slide block 3 is moved out of the process by the pull block 222 and extension of the card block 251 drive.

[0069] The utility model further provides a double -color injection mold, including above -mentioned slide block moving device, this double -color injection mold can realize same technical effect.

[0070] The above description of the disclosed embodiments enables those skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A slider moving device characterized by comprising: The first shooting block (1), the second shooting block (2), the sliding block (3); The first shooting block (1) is provided with a first extrusion surface (11), when the first shooting block (1) translates along the first direction, the first extrusion surface (11) extrudes the sliding block (3) to translate along the second direction towards the mold cavity; The second shooting block (2) is provided with a second extrusion surface (21) for blocking the sliding block (3) from returning; the second shooting block (2) is slidably assembled with a pulling block (22) and an elastic member (23) along the third direction, the elastic member (23) applies an elastic force to the pulling block (22), so that the pulling block (22) protrudes out of the outer surface of the second shooting block (2); The sliding block (3) is provided with an extrusion sliding groove (31), the side wall of the extrusion sliding groove (31) is provided with a pulling groove (32); the extrusion sliding groove (31) is used for sliding contact with the first extrusion surface (11); the extrusion sliding groove (31) is used for sliding contact with the second extrusion surface (21), in the process that the second extrusion surface (21) enters the extrusion sliding groove (31), the extrusion sliding groove (31) applies an extrusion force to the pulling block (22), so that the pulling block (22) is retracted, and a part of the pulling block (22) is clamped into the pulling groove (32), when the second shooting block (2) retracts along the first direction, the pulling block (22) pulls the sliding block (3) out along the second direction.

2. The slider moving apparatus according to claim 1, wherein The pulling block (22) is provided with a limiting recess (221) and a pulling protrusion (222), the limiting recess (221) is used for limiting with a limiting block (24); the pulling protrusion (222) is used for embedding into the pulling groove (32); One end of the pulling protrusion (222) is provided with a friction chamfer (223), the friction chamfer (223) is used for cooperating with the extrusion sliding groove (31) to extrude the pulling block (22) inward.

3. The slider moving apparatus according to claim 2, wherein The limiting recess (221) and the pulling protrusion (222) are respectively arranged at two parallel edges of the same side of the pulling block (22).

4. The slider moving apparatus according to claim 1, wherein The first shooting block (1) is provided with two first extrusion surfaces (11) for simultaneously extruding two sliding blocks (3); the two first extrusion surfaces (11) form a structure with a width contraction along the direction of translation of the first shooting block (1); The second shooting block (2) is provided with two second extrusion surfaces (21), the two second extrusion surfaces (21) form a structure with a width contraction along the direction of translation of the second shooting block (2); the second shooting block (2) is provided with two sets of pulling blocks (22) for simultaneously pulling back two sliding blocks (3).

5. The slider moving apparatus according to claim 1, wherein One second shooting block (2) is correspondingly provided with two pulling blocks (22), the elastic member (23) is arranged between the two pulling blocks (22), and the two pulling blocks (22) can be respectively embedded into two pulling grooves (32) arranged in the same extrusion sliding groove (31).

6. The slider moving apparatus according to claim 5, wherein The second shooting block (2) is provided with a limiting block (24) for limiting the limit position of the pulling block (22) outwardly protruding; The pulling block (22) is provided with a containing groove, and when the two pulling blocks (22) contact each other, the elastic member (23) is completely sunk into the containing groove.

7. The slider moving apparatus according to claim 6, wherein The limiting block (24) is inserted into the second shooting block (2) from one end along the moving direction of the second shooting block (2).

8. The slider moving apparatus according to any one of claims 1 to 7, characterized by The second shooting block (2) is provided with a guiding extension block (25) located at the side with smaller width of the second shooting block (2), and the guiding extension block (25) is provided with an extension clamping block (251) capable of clamping into the pulling groove (32). The pulling block (22) pulls back the sliding block (3) by a distance, and after the pulling block (22) and the sliding block (3) are separated from each other, the extension clamping block (251) takes over to pull the sliding block (3).

9. The slider moving apparatus according to claim 8, wherein The extension clamping block (251) is a width taper structure with width gradually decreasing outwardly. The thickness of the extension clamping block (251) gradually decreases at both ends in the length direction.

10. A two-color injection mold characterized by, The sliding block moving device of any one of claims 1 to 9.

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