A mold core pulling mechanism

Abstract

The present application provides a kind of mould core-pulling mechanism, belong to mould technical field.It solves the problem that existing mould cannot be shaped for profiled part.This mould includes upper die and lower die, core-pulling mechanism includes swing block hinged in lower die and movable slide block arranged in lower die, swing block is located above slide block and swing block abuts on slide block, the top of swing block has cavity wall, profiled cavity is recessed in cavity wall, the bottom of swing block has first guide surface and first abutting surface, the top of slide block has second abutting surface and second guide surface, slide block moves to make first guide surface and second guide surface fit and make swing block swing around hinge point when moving oppositely, when first abutting surface and second abutting surface abut, the forming cavity for processing product is formed between upper die, lower die and cavity wall of swing block.This mould core-pulling mechanism has the advantage that mould can be shaped for profiled part.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to a mold core-pulling mechanism. Background Art

[0002] The mold consists of an upper mold and a lower mold, with a molding cavity between the upper and lower molds. After the upper and lower molds are closed, the heated and melted plastic is injected into the molding cavity under high pressure by the injection molding machine. After cooling and solidification, a molded product is obtained.

[0003] After the product is formed, it needs to be unloaded. The current unloading method involves first opening the upper and lower molds, then using a push rod to loosen the product, and finally removing it from the lower mold. However, for some irregularly shaped products, such as headlight covers, these features, like protruding mounting rings, can interlock with the lower mold after cooling. This prevents the push rod from directly unloading the product after the mold is opened. Summary of the Invention

[0004] The purpose of the present invention is to address the above problems existing in the prior art and to propose a mold core-pulling mechanism to solve the technical problem of how to enable the mold to blank special-shaped parts through the core-pulling mechanism.

[0005] The objectives of the present invention can be achieved through the following technical solutions: A mold core pulling mechanism, the mold includes an upper mold and a lower mold, characterized in that the core pulling mechanism includes a swing block hinged in the lower mold and a sliding block movably arranged in the lower mold, the swing block is located above the sliding block and the swing block abuts on the sliding block, the top of the swing block has a cavity wall, the cavity wall has a concave special-shaped cavity, the bottom of the swing block has a first guide surface and a first abutment surface along the direction from the outer end of the sliding block toward the inner end, the first guide surface and the first abutment surface are connected and the angle between the two is an obtuse angle, the top of the sliding block has a second abutment surface and a second guide surface along the direction from the outer end of the sliding block toward the inner end, the second abutment surface and the second guide surface are connected and the angle between the two is an obtuse angle, the sliding block moves so that the first guide surface and the second guide surface are in contact and when they move relative to each other, the swing block swings around the hinge point, when the first abutment surface and the second abutment surface abut against each other, a molding cavity for processing products is formed between the cavity wall of the upper mold, the lower mold and the swing block.

[0006] During operation, the upper mold and the lower mold are closed, the sliding block moves inward, the first guide surface and the second guide surface are fitted together, the sliding block continues to move inward, the first guide surface and the second guide surface move relative to each other, the sliding block pushes the swing block to swing around the hinge point, the sliding block continues to move inward, so that the first guide surface passes over the second guide surface, at this time the first abutting surface and the second abutting surface abut against each other, the swing block swings into place, and a molding cavity for processing the product is formed between the upper mold, the lower mold and the cavity wall of the swing block, the sliding block continues to move inward to the set position, increasing the contact area of ​​the first abutting surface and the second abutting surface, thereby improving the stability of the swing block. After the product is formed, the sliding block moves outward, and the first abutting surface and the second abutting surface are separated, so that the first guide surface and the second guide surface come into contact. At this time, the swing block begins to rotate around the hinge point, so that the cavity wall begins to separate from the product. The sliding block continues to move outward, and the first guide surface and the second guide surface move relative to each other. The contact area between the first guide surface and the second guide surface continues to increase, so that the protruding part of the product gradually leaves the special-shaped cavity. When the sliding block continues to move outward to the set position, the product is completely separated from the swing block. Then the upper and lower molds are opened, and the product can be fixed by the push rod. The mold is used to discharge the special-shaped part through this core-pulling mechanism. The swing block is located above the sliding block and the swing block is against the sliding block. The gravity of the swing block itself can be reasonably utilized to separate the swing block from the product. The structure is simple and separation is convenient. The special-shaped cavity is part of the molding cavity. The setting of the special-shaped cavity enables the protruding part of the product to be formed in the special-shaped cavity. The first guide surface and the second guide surface cooperate with each other to enable the swing block to rotate around its own hinge point. The first abutment surface and the second abutment surface cooperate with each other to improve the stability of the swing block after positioning and ensure the processing quality of the product.

[0007] In the aforementioned mold core-pulling mechanism, the bottom of the swing block further comprises a third abutting surface, the first guide surface being located between the third abutting surface and the first abutting surface, the third abutting surface and the first guide surface being connected and having an obtuse angle therebetween. When the sliding block moves outward to a set position, the third abutting surface abuts against the second abutting surface, and the first guide surface abuts against the second guide surface. This structure allows the sliding block to better abut the swing block when the product is completely separated from the swing block, thereby improving the stability of the swing block. Furthermore, since the first guide surface abuts against the second guide surface, the sliding block can drive the swing block to swing when it moves to the right, thereby improving efficiency.

[0008] In the aforementioned mold core-pulling mechanism, when a molding cavity for processing a product is formed between the upper mold, lower mold, and the cavity wall of the swing block, a first cavity is defined between the hinged end of the swing block and the sliding block, and a second cavity is defined between the swinging end of the swing block distal from the hinged end and the sliding block. The first and second cavities are filled with air, which reduces the formation of negative pressure in the lower mold, prevents the swinging block from swinging and the sliding block from being affected by air pressure, and ensures smooth swinging and sliding of the swinging block, thereby improving stability.

[0009] In the aforementioned mold core-pulling mechanism, the lower mold has a receiving cavity, in which the swing block and sliding block are both located. The end surface of the swing block's swinging end is spherical or arc-shaped, and the end surface of the swing end conforms to the cavity wall. This structure prevents the swing block from getting stuck in the lower mold during swinging, and also minimizes the gap at the connection between the swing block and the lower mold, eliminating leakage.

[0010] In the aforementioned mold core pulling mechanism, the sliding block includes a main body and an adjustment block. The adjustment block is detachably fixed to the top of the main body, and the second abutment surface and a portion of the second guide surface are located on the adjustment block. The adjustment block can be made of a wear-resistant material and is replaceable, ensuring that the sliding block can push the swing block to a set position, thereby improving product processing accuracy.

[0011] In the above-mentioned mold core-pulling mechanism, a driver is fixedly connected to the outside of the lower mold, and the output shaft of the driver extends into the lower mold and is fixedly connected to the sliding block, and the driver drives the sliding block to move.

[0012] In the aforementioned mold core-pulling mechanism, the swing block has a mounting channel, the top of which penetrates the mold cavity wall and the bottom penetrates the first abutment surface. A spring and an insert rod for circumferential positioning and axial movement are inserted through the mounting channel. A locking nut is threadedly connected to the bottom of the mounting channel. One end of the spring acts on the swing block, and the other end acts on the insert rod. The spring always tends to force the insert rod against the locking nut. When the bottom of the insert rod abuts the second abutment surface, the top of the insert rod extends into the molding cavity. When the bottom of the insert rod leaves the second abutment surface, the top of the insert rod retracts into the mounting channel under the action of the spring force and its own weight. This structure is used when a nameplate or hole needs to be punched on the product. The sliding block moves inward, and its second guide surface pushes the insert upward, overcoming the spring's force. The sliding block continues to move inward. When the bottom of the insert rests against the second abutment surface, the top of the insert continues to extend into the molding cavity and move into position. This means that when the mold is closed, the swing block moves into position first, followed by the insert. The sliding block moves outward, causing the bottom of the insert to leave the second abutment surface. The top of the insert retracts into the mounting channel under the action of the spring force and its own weight. At this point, the first and second abutment surfaces remain in contact. This means that when the mold is opened, the insert moves into position first, followed by the swing block. The spring ensures that the insert can be separated from the product, making it less susceptible to damage. The locking nut is located at the bottom of the mounting channel, leaving only a narrow gap between the top of the mounting channel and the molding cavity, preventing leakage and ensuring product quality. The insert rod is circumferentially positioned and axially movable in the installation channel. This can be achieved by plane contact between part of the outer wall of the insert rod and part of the inner wall of the installation channel, or by providing a protruding bump on the insert rod, providing a long groove in the installation channel along the length direction of the installation channel, and embedding the bump into the groove.

[0013] In the above-mentioned mold core-pulling mechanism, the bottom of the insert rod has a third guide surface and a fourth abutment surface along the direction from the outer end of the sliding block toward the inner end. The third guide surface and the fourth abutment surface are connected and the angle between them is an obtuse angle. The third guide surface can be attached to the second guide surface and can move relative to the second guide surface, and the fourth abutment surface can abut against the second abutment surface. This structure, through the cooperation of the third guide surface and the second guide surface, enables the sliding block to better push the insert rod to move. At the same time, when the mold is opened, the insert rod can be moved gradually to avoid the insert rod from being instantly ejected under the action of the spring force, thereby ensuring product quality. The cooperation of the fourth abutment surface and the second abutment surface improves the stability of the insert rod, thereby improving the processing quality of the product.

[0014] In the above-mentioned mold core pulling mechanism, the outer side wall of the insert rod has a first step surface and a second step surface, and the top inner side wall of the mounting channel has a third step surface. One end of the spring acts on the third step surface, and the other end acts on the first step surface. The spring always has a tendency to make the second step surface rest against the locking nut.

[0015] In the above-mentioned core-pulling mechanism of the mold, the outer wall of the top of the insert rod is tightly fitted with the inner wall of the installation channel. This structure prevents the raw material in the molding cavity from leaking into the installation channel.

[0016] Compared with the prior art, the mold core pulling mechanism provided by the present invention has the following advantages:

[0017] 1. This core-pulling mechanism can make the mold process complex special-shaped workpieces through the cooperation of the swing block, the sliding block and the insert rod, and at the same time, it can prevent the special-shaped workpiece from getting stuck during blanking.

[0018] 2. The third abutment surface, the first guide surface and the first abutment surface provided at the bottom of the swing block of the core-pulling mechanism, as well as the second abutment surface and the second guide surface provided at the top of the sliding block, enable the sliding block to drive the swing block to move more stably, thereby improving product quality; at the same time, the fourth abutment surface and the third guide surface provided at the bottom of the inserting rod, in conjunction with the second abutment surface and the second guide surface provided at the top of the sliding block, can improve the stability of the movement of the inserting rod and improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a state diagram of the swing block of the core-pulling mechanism embodiment 1 when the mold is closed.

[0020] Figure 2 This is a state diagram of the swing block when the mold is opened in the first embodiment of the core pulling mechanism.

[0021] Figure 3 This is a state diagram of the swing block and the insert rod when the mold is closed in the second embodiment of the core pulling mechanism.

[0022] Figure 4 This is a state diagram of the swing block and the inserting rod in the second embodiment of the core pulling mechanism when the mold is opened.

[0023] In the figure, 1. upper mold; 2. lower mold; 3. swing block; 31. cavity wall; 32. special-shaped cavity; 33. first abutment surface; 34. first guide surface; 35. third abutment surface; 36. mounting channel; 361. third step surface; 4. sliding block; 41. second abutment surface; 42. second guide surface; 43. main body; 44. adjusting block; 5. molding cavity; 6. first cavity; 7. second cavity; 8. driver; 9. spring; 10. insert rod; 101. fourth abutment surface; 102. third guide surface; 103. first step surface; 104. second step surface; 11. locking nut. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0025] Example 1

[0026] like Figure 1 、 Figure 2 As shown, the mold includes an upper mold 1, a lower mold 2 and a core pulling mechanism, and the mold core pulling mechanism includes a swing block 3, a sliding block 4 and a driver 8.

[0027] The lower die 2 has a receiving cavity, in which both the swing block 3 and the sliding block 4 are located. The swing block 3 is positioned above the sliding block 4 and rests against it. The hinged end of the swing block 3 is hingedly connected to the lower die 2. In this embodiment, the end surface of the swing end of the swing block 3 is spherical, and the end surface of the swing end of the swing block 3 is in contact with the cavity wall. In actual production, the end surface of the swing end of the swing block 3 is a circular arc surface. The lower die 2 is externally fixed with a driver 8. Driver 8 is a driving cylinder. The output shaft of driver 8 extends into the lower die 2 and is fixedly connected to the sliding block 4. Driver 8 drives the sliding block 4 to move.

[0028] The top of the swing block 3 has a cavity wall 31, and the cavity wall 31 has a concave special-shaped cavity 32. The bottom of the swing block 3 has a third abutment surface 35, a first guide surface 34 and a first abutment surface 33 along the direction from the outer end of the sliding block 4 to the inner end. The third abutment surface 35 and the first guide surface 34 are connected and the angle between the two is an obtuse angle. The first guide surface 34 and the first abutment surface 33 are connected and the angle between the two is an obtuse angle. The top of the sliding block 4 has a second abutment surface 41 and a second guide surface 42 along the direction from the outer end of the sliding block 4 to the inner end. The second abutment surface 41 and the second guide surface 42 are connected and the angle between the two is an obtuse angle. The angle between them is an obtuse angle. In this embodiment, the angle between the third abutment surface 35 and the first guide surface 34 is 145°, the angle between the first guide surface 34 and the first abutment surface 33 is 165°, and the angle between the second abutment surface 41 and the second guide surface 42 is 145°. In actual production, the angle between the third abutment surface 35 and the first guide surface 34 can be 140° or 150°, the angle between the first guide surface 34 and the first abutment surface 33 can be 160° or 170°, and the angle between the second abutment surface 41 and the second guide surface 42 is 140° or 150°.

[0029] The sliding block 4 includes a main body 43 and an adjusting block 44 . The adjusting block 44 is detachably fixed to the top of the main body 43 . The second abutting surface 41 and a portion of the second guiding surface 42 are located on the adjusting block.

[0030] The sliding block 4 moves so that the first guide surface 34 and the second guide surface 42 are in contact with each other and move relative to each other, causing the swing block 3 to swing around the hinge point. When the first abutting surface 33 and the second abutting surface 41 abut against each other, a molding cavity 5 for processing the product is formed between the upper mold 1, the lower mold 2 and the cavity wall 31 of the swing block 3. At this time, there is a first cavity 6 between the hinge end of the swing block 3 and the sliding block 4, and a second cavity 7 between the swing end of the swing block 3 away from the hinge end and the sliding block 4. When the sliding block 4 moves toward the left end of the lower mold 2 to the set position, the third abutting surface 35 abuts on the second abutting surface 41 and the first guide surface 34 abuts on the second guide surface 42.

[0031] During operation, the upper mold 1 and the lower mold 2 are closed, the sliding block 4 moves inward, the first guide surface 34 and the second guide surface 42 are in contact, the sliding block 4 continues to move inward, the first guide surface 34 and the second guide surface 42 move relative to each other, the sliding block 4 pushes the swing block 3 to swing around the hinge point, the sliding block 4 continues to move inward, so that the first guide surface 34 passes over the second guide surface 42, at this time the first abutting surface 33 and the second abutting surface 41 abut, the swing block 3 swings into place, and a molding cavity 5 is formed between the upper mold 1, the lower mold 2 and the cavity wall 31 of the swing block 3, and the sliding block 4 continues to move inward to the set position, as shown in FIG. Figure 1 As shown, the first abutment surface 33 and the second abutment surface 41 are in contact with each other with the largest area. After the product is formed, the sliding block 4 moves outward, and the first abutment surface 33 and the second abutment surface 41 are separated, so that the first guide surface 34 and the second guide surface 42 are in contact. At this time, the swing block 3 starts to rotate around the hinge point, so that the cavity wall 31 is separated from the product. The sliding block 4 continues to move outward, and the first guide surface 34 and the second guide surface 42 move relative to each other. The contact area between the first guide surface 34 and the second guide surface 42 continues to increase, so that the protruding part of the product gradually leaves the special-shaped cavity 32. When the sliding block 4 continues to move outward to the set position, the swing block 3 continues to rotate around the hinge point, as shown in FIG. Figure 2 As shown, until the third abutment surface 35 abuts against the second abutment surface 41 and the first guide surface 34 abuts against the second guide surface 42, the product is completely separated from the swing block 3, and then the upper mold 1 and the lower mold 2 are opened, and the product is fixed by the ejector rod.

[0032] Example 2

[0033] like Figure 3 、 4As shown, the structure and principle of this embodiment are basically the same as those of the first embodiment. The difference is that in this embodiment, a mounting channel 36 is provided in the swing block 3. The top of the mounting channel 36 passes through the cavity wall 31, and the bottom passes through the first abutment surface 33. A spring 9 and an insert rod 10 are provided through the mounting channel 36 for circumferential positioning and axial movement. The bottom of the insert rod 10 has a third guide surface 102 and a fourth abutment surface 101 along the direction from the outer end of the sliding block 4 toward the inner end. The third guide surface 102 and the fourth abutment surface 101 are connected and the angle between them is an obtuse angle. In this embodiment, the angle between the third guide surface 102 and the fourth abutment surface 101 is 145°. In actual production, the angle between the third guide surface 102 and the fourth abutment surface 101 is 140° or 150°. The outer side wall of the insert rod 10 has a first step surface 103 and a second step surface 104, and the top inner side wall of the mounting channel 36 has a third step surface 361. The bottom of the mounting channel 36 is threadedly connected to a locking nut 11. One end of the spring 9 acts on the third step surface 361, and the other end acts on the first step surface 103. The spring 9 always has a tendency to make the second step surface 104 of the insert rod 10 abut against the locking nut 11.

[0034] During mold closing, when the sliding block 4 moves inward, the third guide surface 102 abuts against the second guide surface 42 and the third guide surface 102 can move relative to the second guide surface 42, so that the top of the insert rod 10 extends into the molding cavity 5, and the outer wall of the top of the insert rod 10 fits tightly against the inner wall of the mounting channel 36. When the sliding block 4 continues to move inward, the first abutting surface 33 and the second abutting surface 41 abut against each other and the fourth abutting surface 101 abuts against the second abutting surface 41, and the insert rod 10 is now moved into place. The sliding block 4 moves outward, and when the bottom of the insert rod 10 leaves the second abutment surface 41, the top of the insert rod 10 begins to retract into the installation channel 36 under the action of the elastic force of the spring 9 and its own gravity. The sliding block 4 continues to move to the left, and the top of the insert rod 10 continues to retract into the installation channel 36 until the second step surface 104 abuts against the locking nut 11. The insert rod 10 moves into place, and the sliding block 4 continues to move outward, so that the first abutment surface 33 and the second abutment surface 41 are disengaged, and the swing block 3 begins to swing.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0036] Although this document frequently uses terms such as upper die 1, lower die 2, swing block 3, cavity wall 31, special-shaped cavity 32, first abutting surface 33, first guide surface 34, third abutting surface 35, mounting channel 36, third step surface 361, sliding block 4, second abutting surface 41, second guide surface 42, main body 43, adjustment block 44, molding cavity 5, first cavity 6, second cavity 7, driver 8, spring 9, insert 10, fourth abutting surface 101, third guide surface 102, first step surface 103, second step surface 104, and locking nut 11, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A mold core pulling mechanism, the mold comprising an upper mold (1) and a lower mold (2), characterized in that: The core pulling mechanism comprises a swing block (3) hinged in a lower die (2) and a sliding block (4) movably arranged in the lower die (2); the swing block (3) is located above the sliding block (4) and the swing block (3) abuts against the sliding block (4); the top of the swing block (3) has a cavity wall (31), the cavity wall (31) has a concave special-shaped cavity (32); the bottom of the swing block (3) has a first guide surface (34) and a first abutting surface (33) along the direction from the outer end of the sliding block (4) toward the inner end; the first guide surface (34) and the first abutting surface (33) are connected and the angle between the two is an obtuse angle. The top of the sliding block (4) has a second abutting surface (41) and a second guide surface (42) along the direction from the outer end of the sliding block (4) toward the inner end. The second abutting surface (41) and the second guide surface (42) are connected and the angle between the two is an obtuse angle. When the sliding block (4) moves, the first guide surface (34) and the second guide surface (42) are in contact with each other and move relative to each other, causing the swing block (3) to swing around the hinge point. When the first abutting surface (33) and the second abutting surface (41) abut against each other, a molding cavity (5) for processing a product is formed between the upper mold (1), the lower mold (2) and the cavity wall (31) of the swing block (3).

2. A mold core pulling mechanism according to claim 1, characterized in that: The bottom of the swing block (3) further comprises a third abutting surface (35), the first guide surface (34) is located between the third abutting surface (35) and the first abutting surface (33), the third abutting surface (35) and the first guide surface (34) are connected and the included angle between the third abutting surface (35) and the first guide surface (34) is an obtuse angle, and when the sliding block (4) moves outward to a set position, the third abutting surface (35) abuts against the second abutting surface (41) and the first guide surface (34) abuts against the second guide surface (42).

3. A mold core pulling mechanism according to claim 1 or 2, characterized in that: When a molding cavity (5) for processing a product is formed between the upper mold (1), the lower mold (2) and the cavity wall (31) of the swing block (3), a first cavity (6) is provided between the hinged end of the swing block (3) and the sliding block (4), and a second cavity (7) is provided between the swinging end of the swing block (3) away from the hinged end and the sliding block (4).

4. A mold core pulling mechanism according to claim 3, characterized in that: The lower mold (2) has an accommodating cavity, and the swing block (3) and the sliding block (4) are both located in the accommodating cavity. The end surface of the swing end of the swing block (3) is a spherical surface or an arc surface, and the end surface of the swing end is in contact with the cavity wall of the accommodating cavity.

5. A mold core pulling mechanism according to claim 1 or 2, characterized in that: The sliding block (4) comprises a main body (43) and an adjusting block (44); the adjusting block (44) is detachably fixed to the top of the main body (43); the second abutting surface (41) and part of the second guide surface (42) are located on the adjusting block.

6. A mold core pulling mechanism according to claim 1 or 2, characterized in that: The lower die (2) is fixedly connected to a driver (8) on the outside. The output shaft of the driver (8) extends into the lower die (2) and is fixedly connected to the sliding block (4). The driver (8) drives the sliding block (4) to move.

7. A mold core pulling mechanism according to claim 1 or 2, characterized in that: The swing block (3) has a mounting channel (36), the top of the mounting channel (36) passes through the cavity wall (31), and the bottom passes through the first abutment surface (33). A spring (9) and a circumferentially positioned insert rod (10) are passed through the mounting channel (36) and are axially movable. The bottom of the mounting channel (36) is threadedly connected with a locking nut (11). One end of the spring (9) acts on the swing block (3), and the other end acts on the insert rod (10). The spring (9) always has a tendency to make the insert rod (10) abut against the locking nut (11). When the bottom of the insert rod (10) abuts against the second abutment surface (41), the top of the insert rod (10) extends into the molding cavity (5). When the bottom of the insert rod (10) leaves the second abutment surface (41), the top of the insert rod (10) retracts into the mounting channel (36) under the action of the elastic force of the spring (9) and its own weight.

8. A mold core pulling mechanism according to claim 7, characterized in that: The bottom of the insert rod (10) has a third guide surface (102) and a fourth abutting surface (101) along the direction from the outer end of the sliding block (4) toward the inner end. The third guide surface (102) and the fourth abutting surface (101) are connected and the angle between the third guide surface (102) and the fourth abutting surface (101) is an obtuse angle. The third guide surface (102) can be attached to the second guide surface (42) and the third guide surface (102) can move relative to the second guide surface (42). The fourth abutting surface (101) can abut against the second abutting surface (41).

9. A mold core pulling mechanism according to claim 7, characterized in that: The outer side wall of the insert rod (10) has a first step surface (103) and a second step surface (104), and the top inner side wall of the mounting channel (36) has a third step surface (361). One end of the spring (9) acts on the third step surface (361), and the other end acts on the first step surface (103). The spring (9) always has a tendency to make the second step surface (104) abut against the locking nut (11).

10. The mold core pulling mechanism according to claim 7, characterized in that: The outer side wall of the top of the insert rod (10) is tightly fitted with the inner side wall of the installation channel (36).

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