CN214773706U - Plastic mould with adjustable runner - Google Patents

Abstract

The application relates to a plastic mould with an adjustable flow passage, which comprises a mounting block, a connecting rod, a blocking block and a driving structure, wherein a mounting hole communicated with the flow passage is formed in a mould body, and the mounting hole is communicated with the outside of the mould body; the mounting block is fixedly arranged at one end of the mounting hole far away from the flow channel, and the outer surface of the mounting block is abutted against the inner wall of the mounting hole; one end of the connecting rod is positioned outside the die body, the other end of the connecting rod penetrates through the mounting block and is positioned in the mounting hole, and the connecting rod is connected with the mounting block in a sliding manner; the blocking block is fixedly arranged at one end, located in the mounting hole, of the connecting rod, and the distance between one end, far away from the connecting rod, of the blocking block and the flow channel is used for controlling the passing area of the flow channel; the driving mechanism is arranged on the die body and used for driving the connecting rod to slide in a reciprocating mode along the length direction of the connecting rod. This application has the effect that makes runner flow control work labour saving and time saving.

Description

Plastic mould with adjustable runner

Technical Field

The application relates to the technical field of plastic molds, in particular to a plastic mold with an adjustable runner.

Background

In the injection molding industry, a complex mold is provided with a plurality of cavities, so that when a runner system is designed, in order to balance the filling of each cavity, the flow of the runner needs to be controlled, and the purpose of controlling the flow of the runner and balancing the filling of the cavities is achieved by changing the sectional areas of the runners corresponding to different cavities.

In the correlation technique, need test the mould actual filling volume after mould production is accomplished to satisfy the actual demand of processing man-hour of production, consequently just need adjust the size of runner flow, and when adjusting the size of runner flow, can take the mould apart earlier, then plus the obstacle adjusts the area of passing through of runner, in order to realize the regulation to the flow size.

In view of the above related technologies, the inventor believes that there is a defect that the flow rate adjustment of the flow channel requires repeated disassembling of the mold and then placing of additional barriers of different sizes so that each cavity can be filled and balanced, thereby consuming time and labor.

SUMMERY OF THE UTILITY MODEL

In order to make runner flow control work can labour saving and time saving, this application provides the plastic mould of adjustable runner.

The application provides a plastic mould of adjustable runner adopts following technical scheme:

a plastic mould capable of adjusting a flow passage comprises a mounting block, a connecting rod, a blocking block and a driving mechanism, wherein a mounting hole communicated with the flow passage is formed in a mould body, and the mounting hole is communicated with the outside of the mould body; the mounting block is fixedly arranged at one end of the mounting hole far away from the flow channel, and the outer surface of the mounting block is abutted against the inner wall of the mounting hole; one end of the connecting rod is positioned outside the die body, the other end of the connecting rod penetrates through the mounting block and is positioned in the mounting hole, and the connecting rod is connected with the mounting block in a sliding manner; the blocking block is fixedly arranged at one end, located in the mounting hole, of the connecting rod, and the distance between one end, far away from the connecting rod, of the blocking block and the flow channel is used for controlling the passing area of the flow channel; the driving mechanism is arranged on the die body and used for driving the connecting rod to slide in a reciprocating mode along the length direction of the connecting rod.

Through adopting above-mentioned technical scheme, when will adjusting the runner flow, accessible actuating mechanism makes the connecting rod along self length direction reciprocating sliding, then the connecting rod is at gliding in-process, it just can change to block the piece and keep away from the interval between connecting rod one end and the runner, thereby just the area of passing through of the runner that changes, and then reach the purpose that changes the runner flow, compare and unpack the mould apart with needs, then the mode of plus obstacle, this kind of design, can be in the test, adjust gradually and block the interval between piece and the runner, thereby can reach the balanced mesh of each type chamber packing more fast, and then make runner flow control work ability labour saving and time saving.

Preferably, the driving mechanism comprises a mounting pipe, a screw cap, a lead screw and an elastic piece, the mounting pipe is fixedly arranged on the die body, and the axis of the mounting hole is positioned in the inner ring of the mounting pipe; the rotary cover is sleeved on one end of the mounting pipe far away from the mounting hole and is rotatably connected with the outer wall of the mounting pipe through a bearing; one end of the screw rod is positioned in the mounting pipe and is abutted against one end of the connecting rod, which is far away from the flow channel, and the other end of the screw rod penetrates out of the screw cap and is in threaded connection with the screw cap; the elastic piece is arranged on the mounting block and used for enabling the connecting rod to move towards the direction outside the flow passage.

By adopting the technical scheme, when the flow of the flow channel is to be regulated, the rotary cover can be rotated, and the rotary cover is rotationally connected with the mounting pipe through the bearing, so that the rotary cover only can rotate around the axis of the rotary cover, in the rotating process, the screw rod can move along the axis direction of the rotary cover due to the threaded connection between the screw rod and the rotary cover, and if the screw rod moves towards the direction of the flow channel, the screw rod can push the connecting rod to move, so that the distance between the blocking block and the flow channel is reduced, and the flow of the flow channel is reduced at the moment; if the lead screw is towards when keeping away from the direction of runner, the connecting rod can drive the stopper to remove to the direction of mounting hole under the effect of elastic component to make the interval grow between stopper and the runner, the runner flow can increase this moment.

Preferably, the lead screw is located one of the mounting tube and is served fixed cover and be equipped with the holding ring, when blockking that the piece is kept away from connecting rod one end and be in the mounting hole, the holding ring separates the fender with spiral cover near mounting hole side surface formation.

Through adopting above-mentioned technical scheme, when rotating the spiral cover and making lead screw be close to connecting rod one end and remove to the direction outside the installation pipe gradually, stop that the interval between piece and the runner can grow gradually, wherein when stopping that the piece is in the mounting hole completely, the runner flow can be in the maximum value, and take place to separate between the holding ring this moment and the spiral cover and keep off, make to rotate the spiral cover and also be difficult for making the lead screw continue outwards to rotate, so this kind of design, because of the setting of holding ring, the staff can be according to the motion state of lead screw, judge easily that the flow in the runner this moment is in the maximum value, thereby be convenient for adjust the runner flow and work.

Preferably, the end part of the screw rod, which is close to one end of the connecting rod, is coaxially provided with a top block, the top block is in a conical shape, and the end with the larger cross-sectional area of the top block is fixedly connected with the screw rod; and the end face of the connecting rod, which is close to one end of the screw rod, is coaxially provided with an abutting groove matched with the ejector block.

Through adopting above-mentioned technical scheme, under the cooperation in kicking block and butt joint groove, when the connecting rod was moved in the lead screw top, the power that the lead screw was used in on the connecting rod can match more with the axis of connecting rod, then the lead screw can more smoothly push up and move the connecting rod removal to this makes the difficult condition that the card shell appears of process of rotating the spiral cover, thereby is convenient for carry out flow control work.

Preferably, the outer wall of the installation pipe is provided with a limiting part, and when the stop block is adjusted to a proper position, the limiting part is used for limiting the rotation of the screw cap.

Through adopting above-mentioned technical scheme, because of the setting of locating part, then can be after the flow control that flows, make the spiral cover also be difficult for taking place to rotate under the condition that receives external force through the locating part to the later stage plastic mould of being convenient for carries out the work of moulding plastics.

Preferably, the surface of the peripheral edge of the spiral cover is provided with a plurality of clamping grooves, the notches of the clamping grooves face the mounting hole, and the clamping grooves are uniformly arranged in the axial direction of the mounting pipe; the limiting piece comprises an L-shaped block, a clamping block and a spring in an extension state, the L-shaped block is fixedly arranged on the outer wall of the mounting pipe, and one end of the L-shaped block, which is far away from the mounting block, faces to the peripheral edge of the spiral cover; one end of the clamping block is slidably sleeved on one end of the L-shaped block close to the rotary cover, and the other end of the clamping block is matched with the clamping groove to form a baffle for the rotary cover; the spring is sleeved on one end, close to the spiral cover, of the L-shaped block, one end of the spring is fixedly connected with the L-shaped block, the other end of the spring is fixedly connected with the clamping block, and the spring is used for enabling the clamping block to move towards the spiral cover.

Through adopting above-mentioned technical scheme, then when will carrying out the flow regulation, the pulling fixture block and make the spring shrink, treat that the fixture block breaks away from the draw-in groove when, the staff just can rotate the spiral cover to adjust the runner flow, treat after the regulation, loosen the fixture block, make the fixture block slide in the draw-in groove under the effect of spring, and the spring is in the extension state this moment, thereby make the fixture block insert firmly in the draw-in groove, and then reach and make the spiral cover be difficult for the pivoted purpose when receiving external force.

Preferably, the fixture block comprises a fixing part and a clamping part, and the fixing part is sleeved on the L-shaped block and is fixedly connected with the spring; the joint portion articulates on the fixed part keeps away from one side surface of spring to when joint portion breaks away from the draw-in groove, the spring is used for making there is the interval between articulated department and the spiral cover of joint portion and fixed part.

Through adopting above-mentioned technical scheme, when will carrying out flow regulation, the pulling fixture block makes joint portion break away from the draw-in groove, can slightly touch joint portion after that, then joint portion can rotate around the articulated department with the fixed part along with self gravity, at last the drooping gets off, thereby joint portion is nearest with the articulated department distance spiral cover of fixed part, this moment because of the restriction of spring extension state, make the articulated department of joint portion and fixed part be difficult for contacting the spiral cover, thereby be difficult for influencing the rotation of spiral cover, this kind of design, when breaking away from the draw-in groove with the fixture block, just need not push down the fixture block always and make in the fixture block no longer inserts the draw-in groove, only need slightly touch joint portion make joint portion hang down can, thereby be convenient for follow-up rotate the spiral cover.

Preferably, a sealing sleeve is fixedly arranged on the inner wall of the mounting hole, and the sealing sleeve also sleeves the mounting block.

Through adopting above-mentioned technical scheme, because of the setting of seal cover, can make the leakproofness between installation piece and the mounting hole obtain promoting, make the hot-fluid that is in the runner difficult gap from between installation piece and the mounting hole flow, help promoting the whole leakproofness of mould.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the arrangement of the mounting block, the connecting rod, the blocking block and the driving mechanism, the distance between the blocking block and the flow channel can be gradually adjusted during testing, so that the purpose of filling balance of various cavities can be achieved more quickly, and the flow channel flow regulation work can be time-saving and labor-saving;

2. through the arrangement of the positioning ring, a worker can easily judge that the flow in the flow channel is at the maximum value at the moment according to the motion state of the lead screw, so that the flow of the flow channel can be conveniently adjusted;

3. through the setting in kicking block and butt joint groove, when the connecting rod was moved in the lead screw top, the power that the lead screw was used in on the connecting rod can match more with the axis of connecting rod, then the lead screw can more smoothly push up and move the connecting rod removal to this makes the difficult condition that the card shell appears of process of rotating the spiral cover.

Drawings

Fig. 1 is a sectional structure diagram of a plastic mold with an adjustable runner according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram illustrating a limiting manner between a limiting member and a cap in the embodiment of the present application.

Description of reference numerals: 1. a mold body; 11. a flow channel; 12. mounting holes; 2. mounting blocks; 3. a connecting rod; 31. a butt joint groove; 4. a blocking block; 5. a drive mechanism; 51. installing a pipe; 52. screwing a cover; 521. a card slot; 53. a lead screw; 531. a positioning ring; 532. a top block; 54. an elastic member; 6. a limiting member; 61. an L-shaped block; 62. a clamping block; 621. a fixed part; 622. a clamping part; 63. a spring; 7. sealing sleeves; 8. a circular plate.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses plastic mould of adjustable runner. Referring to fig. 1, the plastic mold with an adjustable flow passage comprises a mold body 1, specifically, a flow passage 11 and a mounting hole 12 communicated with the flow passage 11 are formed in the mold body 1, wherein the cross section of the mounting hole 12 is rectangular, the mounting hole 12 is further communicated with the outside of the mold body 1, a mounting block 2 is further coaxially fixed on the inner wall of the mounting hole 12, the mounting block 2 is in a cuboid shape, the mounting block 2 is located at one end, away from the flow passage 11, of the mounting hole 12, in the embodiment, the mounting block 2 is firstly fixed on a circular plate 8 through a bolt, and then the circular plate 8 is fixed on the mold body 1 through the bolt, so that the purpose of fixing the mounting block 2 in the mounting hole 12 is achieved.

Referring to fig. 1, in this embodiment, a sealing sleeve 7 is sleeved on the circumferential side surface of the mounting block 2 through bonding, the sealing sleeve 7 is made of an elastic material, the mounting block 2 is indirectly abutted to the inner wall of the mounting hole 12 through the sealing sleeve 7, and during abutting, the sealing sleeve 7 is elastically deformed, so that when hot fluid flows through the flow channel 11, the hot fluid is not easily flowed out from the gap between the mounting block 2 and the mounting hole 12, and the sealing performance of the whole mold is maintained.

Referring to fig. 1, a connecting rod 3 is slidably disposed on a mounting block 2, the connecting rod 3 is in a square bar shape, specifically, one end of the connecting rod 3 is located in a mounting hole 12, the other end of the connecting rod passes through the axis of the mounting block 2 and is located outside a die body 1, and the connecting rod 3 and the mounting block 2 are in clearance fit, so as to achieve the purpose of enabling the connecting rod 3 to slide in a reciprocating manner along the length direction of the connecting rod 3, in this embodiment, a blocking block 4 is coaxially fixed on one end of the connecting rod 3 located in the mounting hole 12, the blocking block 4 is in a cuboid shape, one end of the blocking block 4 is located in the mounting hole 12, and the end is abutted against the inner wall of the mounting hole 12, and a variable distance exists between the other end of the connecting rod and the inner wall of one side of the mounting hole 12 far away from the flow channel 11, so that when the distance is changed, the passing area of the flow channel 11 can be changed, and the flow rate of the flow channel 11 can be changed.

Referring to fig. 1, a driving mechanism 5 is arranged on a die body 1, specifically, the driving mechanism 5 includes an installation pipe 51 and a screw cap 52, the installation pipe 51 is in a circular pipe shape, the installation pipe 51 is fixed on the die body 1, the axis of the installation pipe 51 is on the same straight line with the axis of the installation hole 12, and the pipe diameter of the installation pipe 51 is larger than the diameter of the circular plate 8 on the installation block 2; the screw cap 52 is formed by coaxially fixing a circular ring on the bottom surface of a cylinder, and the diameter of the circular ring is the same as that of the cylinder, wherein the screw cap 52 is rotatably connected with the outer wall of the mounting tube 51 through a bearing, so that the screw cap 52 can only rotate around the axis of the screw cap, and the pipe orifice of the mounting tube 51 at the end far away from the mounting block 2 is covered, thereby providing a mounting base for other parts of the driving mechanism 5.

Referring to fig. 1, the driving mechanism 5 further includes a screw 53 and an elastic member 54, specifically, one end of the screw 53 is located in the mounting tube 51 and abuts against an end of the connecting rod 3 away from one end of the stopper 4, and the other end of the screw passes through a position where the screw cap 52 covers the opening of the mounting tube 51, in this embodiment, the screw 53 and the screw cap 52 are coaxially arranged, and the screw 53 is further connected with the screw cap 52 by a thread; the elastic member 54 is a spring, one end of the elastic member 54 is adhered to the surface of the mounting block 2 away from the blocking block 4, and the other end is adhered to the end of the connecting rod 3 close to the lead screw 53, so that after the elastic member 54 receives a compression force, the force applied to the connecting rod 3 by the elastic member 54 makes the connecting rod 3 tend to move towards the lead screw 53.

Referring to fig. 1, when the screw cap 52 is rotated to move the screw rod 53 toward the mounting block 2, the screw rod 53 pushes the connecting rod 3 to move toward the position of the flow channel 11, the connecting rod 3 passes through the blocking block 4, so that the distance between the blocking block 4 and the flow channel 11 is reduced, at this time, the flow rate in the flow channel 11 is reduced, and when the screw cap 52 is rotated to move the screw rod 53 toward the direction away from the mounting block 2, one end of the screw rod 53, which is abutted against the connecting rod 3, gradually moves toward the screw cap 52, and at the same time, the elastic member 54 applies its own elastic force to the connecting rod 3, so that one end of the connecting rod 3, which is close to the screw rod 53, moves together with the screw rod 53, so that the distance between the blocking block 4 and the flow channel 11 is increased, and at this time, the flow rate in the flow channel 11 is increased.

Referring to fig. 1, a top block 532 is coaxially fixed on an end surface of the lead screw 53 near one end of the connecting rod 3, specifically, the top block 532 is in a conical shape, and the end of the top block 532 with a smaller cross-sectional area is fixedly connected with the lead screw 53; the butt groove 31 that matches with kicking block 532 shape is then seted up on the terminal surface that connecting rod 3 is close to lead screw 53 one end to butt groove 31 and the coaxial setting of connecting rod 3, then under the cooperation of kicking block 532 and butt groove 31, the power of giving connecting rod 3 when lead screw 53 removes, can be better with the axis of connecting rod 3 on same straight line, so lead screw 53 can more smoothly push up connecting rod 3 and remove, thereby the difficult condition that the card shell appears in the in-process of rotating spiral cover 52.

Referring to fig. 1, in this embodiment, the end of the screw 53 located in the mounting tube 51 is fixedly sleeved with a positioning ring 531, the positioning ring 531 is in a circular ring shape, and the positioning ring 531 and the screw 53 are coaxially arranged, and when the end of the blocking block 4 away from the connecting rod 3 is completely located in the mounting hole 12, the surface of one side of the positioning ring 531 away from the mounting block 2 abuts against the screw cap 52, even though the screw cap 52 can rotate, the screw 53 is not easy to continue to move in the direction away from the mounting block 2, and then the worker can easily judge that the flow in the flow channel 11 is at the maximum value at this time according to the movement state of the screw 53, thereby facilitating the adjustment of the flow channel 11.

Referring to fig. 1 and 2, a limiting member 6 is disposed on an outer wall of the mounting tube 51, specifically, the limiting member 6 includes an L-shaped block 61 and a fixture block 62, one end of the L-shaped block 61 is fixed on the outer wall of the mounting tube 51, and the other end faces a position where an edge of the periphery of the screw cap 52 is located; the fixture block 62 includes a fixing portion 621 and a fastening portion 622, the fixing portion 621 is cylindrical, the fixing portion 621 slidably fits over an end of the L-shaped block 61 away from the mounting tube 51, and the fixing portion 621 and the end of the L-shaped block 61 away from the mounting tube 51 are perpendicular to each other.

Referring to fig. 1 and 2, the fastening portion 622 is triangular prism-shaped, the fastening portion 622 is disposed on a side surface of the fixing portion 621 close to the cap 52, specifically, one end of the fastening portion 622 is hinged to the fixing portion 621, the other end faces the peripheral edge of the cap 52, and the end facing the cap 52 is a position of one side edge of the fastening portion 622.

Referring to fig. 1 and 2, the position-limiting member 6 further includes a spring 63 in an extended state, one end of the spring 63 is adhered to the L-shaped block 61, the other end is adhered to a side surface of the fixing portion 621 away from the clamping portion 622, and when the spring 63 receives a compressive force, the spring 63 applies a force to the latch 62 in a direction toward the cap 52; a plurality of clamping grooves 521 are uniformly formed in the plane of the circular ring far away from the cylinder in the screw cap 52, the clamping grooves 521 are uniformly arranged around the axis of the mounting pipe 51, and the shape of each clamping groove 521 is matched with the shape of the clamping portion 622.

Referring to fig. 1 and 2, when adjusting the work and ending, press spring 63 earlier, make spring 63 compressed, rotate joint portion 622 next, make joint portion 622 be the state of standing up, then loosen spring 63, make joint portion 622 insert in the draw-in groove 521, be in the extension state because of spring 63 this moment, so can make fixture block 62 have the power to spiral cover 52 direction removal, thereby make fixture block 62 insert firmly in the draw-in groove 521, and then make spiral cover 52 also difficult the emergence when receiving external force rotate, the flow that helps the mould to use in runner 11 can remain stable.

Referring to fig. 1 and 2, when the adjustment operation is required, the spring 63 is pressed first, so that the clamping portion 622 is separated from the clamping groove 521, and then the clamping portion 622 is slightly touched, so that the clamping portion 622 is drooping down, and the hinged portion of the clamping portion 622 and the fixing portion 621 is closest to the screw cap 52, so that the parameter of the spring 63 can be limited, so that a space exists between the hinged portion of the clamping portion 622 and the fixing portion 621 and the screw cap 52, so that the hinged portion of the clamping portion 622 and the fixing portion 621 is not easily touched to the screw cap 52, and further the rotation of the screw cap 52 is not easily influenced.

Referring to fig. 1 and fig. 2, in the present embodiment, due to the parameter limitation of the spring 63 in the limiting member 6, on one hand, when the screw cap 52 is locked, the latch 62 is tightly inserted into the slot 521, and on the other hand, when the screw cap 52 is unlocked, people do not need to press the spring 63 all the time, so that the latch 62 is not easily interfered with the rotation of the screw cap 52, thereby facilitating the rotation of the screw cap 52.

Referring to fig. 1 and fig. 2, in this embodiment, the hinge connection between the fastening portion 622 and the fixing portion 621 achieves the purpose that the fastening block 62 is not likely to interfere with the rotation of the fastening block 52 when the screw cap 52 is unlocked, and on the other hand, when the fastening block 62 is inserted into the fastening slot 521, when the screw cap 52 is subjected to an external force, the force applied to the fastening block 62 by the screw cap 52 is perpendicular to the rotation trend of the fastening portion 622 around the hinge connection of the fixing portion 621, so that the fastening block 62 is not likely to be hinged to the fixing portion 621 due to the fastening portion 622, and the limit effect of the fastening block 62 on the screw cap 52 is greatly weakened.

The implementation principle of the plastic mold with the adjustable runner in the embodiment of the application is as follows: when the flow of the flow channel 11 is to be adjusted, the spring 63 can be pressed first, so that the clamping portion 622 is separated from the clamping groove 521, and the clamping portion 622 can be pulled down, at this time, the screw cap 52 is in an unlocked state, then, the screw cap 52 can be rotated, in the rotating process of the screw cap 52, the screw 53 can move along the axis direction of the screw 53, if the screw 53 moves towards the direction of the mounting block 2, the screw 53 can push the connecting rod 3 to move towards the direction of the flow channel 11, at this time, the distance between the blocking block 4 and the flow channel 11 can be reduced, so that the flow in the flow channel 11 is reduced, if the screw 53 moves towards the direction far away from the mounting block 2, the elastic part 54 can enable the connecting rod 3 to move along with the screw 53, at this time, the distance between the blocking block 4 and the flow channel 11 can be increased, and therefore the flow in the flow channel 11 is increased.

After the adjustment operation is finished, the spring 63 is pressed first, so that the hinged position of the clamping portion 622 and the fixing portion 621 is far away from the screw cap 52, then the clamping portion 622 is in an upright state, then the spring 63 is loosened to enable the clamping portion 622 to be inserted into the clamping groove 521, at the moment, the spring 63 is still in an extension state, so that the clamping block 62 is tightly inserted into the clamping groove 521, and the screw cap 52 is in a locking state.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a plastic mould of adjustable runner which characterized in that: the mold comprises a mounting block (2), a connecting rod (3), a blocking block (4) and a driving mechanism (5), wherein a mounting hole (12) communicated with a flow channel (11) is formed in a mold body (1), and the mounting hole (12) is communicated with the outside of the mold body (1); the mounting block (2) is fixedly arranged at one end of the mounting hole (12) far away from the runner (11), and the outer surface of the mounting block (2) is abutted against the inner wall of the mounting hole (12); one end of the connecting rod (3) is positioned outside the die body (1), the other end of the connecting rod passes through the mounting block (2) and is positioned in the mounting hole (12), and the connecting rod (3) is connected with the mounting block (2) in a sliding manner; the blocking block (4) is fixedly arranged at one end, located in the mounting hole (12), of the connecting rod (3), and the distance between one end, far away from the connecting rod (3), of the blocking block (4) and the flow channel (11) is used for controlling the passing area of the flow channel (11); the driving mechanism (5) is arranged on the die body (1), and the driving mechanism (5) is used for driving the connecting rod (3) to slide in a reciprocating mode along the length direction of the connecting rod.

2. The runner-adjustable plastic mold of claim 1, wherein: the driving mechanism (5) comprises a mounting pipe (51), a screw cap (52), a lead screw (53) and an elastic piece (54), the mounting pipe (51) is fixedly arranged on the die body (1), and the axis of the mounting hole (12) is positioned in the inner ring of the mounting pipe (51); the rotary cover (52) is sleeved on one end of the mounting pipe (51) far away from the mounting hole (12), and the rotary cover (52) is rotatably connected with the outer wall of the mounting pipe (51) through a bearing; one end of the screw rod (53) is positioned in the mounting pipe (51) and is abutted against one end of the connecting rod (3) far away from the flow channel (11), and the other end of the screw rod penetrates out of the rotary cover (52) and is in threaded connection with the rotary cover (52); the elastic member (54) is provided on the mounting block (2), and the elastic member (54) is used to move the connecting rod (3) in a direction out of the flow passage (11).

3. The runner-adjustable plastic mold of claim 2, wherein: the lead screw (53) is located one end of installing pipe (51) and is fixed the cover and be equipped with holding ring (531), when blockking that piece (4) keep away from connecting rod (3) one end and be in mounting hole (12), holding ring (531) and spiral cover (52) are close to mounting hole (12) one side surface and form and separate the fender.

4. The runner-adjustable plastic mold of claim 2, wherein: the end part of the lead screw (53) close to one end of the connecting rod (3) is coaxially provided with a top block (532), the top block (532) is in a conical shape, and the end with the larger cross-sectional area of the top block (532) is fixedly connected with the lead screw (53); and the end face of one end, close to the screw rod (53), of the connecting rod (3) is coaxially provided with an abutting groove (31) matched with the ejector block (532).

5. The runner-adjustable plastic mold of claim 2, wherein: the outer wall of the installation pipe (51) is provided with a limiting piece (6), and when the stop block (4) is adjusted to a proper position, the limiting piece (6) is used for limiting the rotation of the rotary cover (52).

6. The runner-adjustable plastic mold of claim 5, wherein: the surface of the peripheral side edge of the screw cover (52) is provided with a plurality of clamping grooves (521), the notches of the clamping grooves (521) face the mounting hole (12), and the clamping grooves (521) are uniformly arranged around the axial direction of the mounting pipe (51); the limiting piece (6) comprises an L-shaped block (61), a clamping block (62) and a spring (63) in an extension state, the L-shaped block (61) is fixedly arranged on the outer wall of the mounting pipe (51), and one end, far away from the mounting block (2), of the L-shaped block (61) faces to the peripheral side edge of the screw cover (52); one end of the clamping block (62) is slidably sleeved on one end of the L-shaped block (61) close to the rotary cover (52), and the other end of the clamping block is matched with the clamping groove (521) to form a separation block for the rotary cover (52); the spring (63) is sleeved on one end, close to the spiral cover (52), of the L-shaped block (61), one end of the spring (63) is fixedly connected with the L-shaped block (61), the other end of the spring is fixedly connected with the clamping block (62), and the spring (63) is used for enabling the clamping block (62) to move towards the spiral cover (52).

7. The runner-adjustable plastic mold of claim 6, wherein: the clamping block (62) comprises a fixing part (621) and a clamping part (622), the fixing part (621) is sleeved on the L-shaped block (61) and is fixedly connected with the spring (63); the clamping portion (622) is hinged to one side surface, away from the spring (63), of the fixing portion (621), and when the clamping portion (622) is separated from the clamping groove (521), the spring (63) is used for enabling a distance to exist between the hinged position of the clamping portion (622) and the fixing portion (621) and the rotary cover (52).

8. The runner-adjustable plastic mold of claim 1, wherein: and a sealing sleeve (7) is fixedly arranged on the inner wall of the mounting hole (12), and the mounting block (2) is sleeved with the sealing sleeve (7).

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