Mold adjustment oil system, mold adjustment device, mold assembly and injection molding machine

Abstract

The present application provides a mold adjustment oil circuit system, a mold adjustment device, a mold assembly and an injection molding machine. The mold adjustment oil circuit system includes: a motor, which can be used to drive a mold adjustment mechanism; a brake, which can be driven by hydraulic oil and can make at least two reactions according to the different hydraulic pressures acting on the brake. When the brake is in a first state where the hydraulic pressure is less than a preset value, the brake can be used to brake the mold adjustment mechanism; when the brake is in a second state where the hydraulic pressure is greater than or equal to the preset value, the brake can stop braking the mold adjustment mechanism; a first hydraulic oil circuit, where the motor is arranged in the first hydraulic oil circuit, and the first hydraulic oil circuit has an input end for inputting hydraulic oil and an output end for discharging hydraulic oil; a second hydraulic oil circuit, which is connected to the first hydraulic oil circuit and the brake, and is used to transfer hydraulic oil from the first hydraulic oil circuit to the brake; a pressure regulating member, which is configured to be able to adjust the hydraulic pressure of the second hydraulic oil circuit. The mold adjustment oil circuit system can effectively and stably maintain the clamping force.

Description

Technical Field

[0001] The present application relates to the field of injection molding equipment, and in particular to a mold adjustment oil circuit system, a mold adjustment device, a mold assembly and an injection molding machine. Background Art

[0002] The injection molding machine produces products by heating the melt to a molten state, injecting the molten melt into the mold for molding, and then cooling the melt for a period of time and solidifying it before demolding. During the injection molding process, the clamping mechanism needs to provide sufficient locking force to overcome the expansion force of the melt in the cavity on the mold during injection. If the clamping force is insufficient, the product may produce flash (also known as overflow, flashing, etc.) at the parting surface of the mold. Injection molded products have flash that affects not only the appearance of the product, but also the quality of the product, which is a problem that cannot be ignored. Summary of the invention

[0003] One purpose of the present application is to propose a mold adjustment oil circuit system that can assist the mold adjustment mechanism to achieve self-locking of the mold adjustment mechanism, thereby reliably and effectively ensuring the stability of the clamping force.

[0004] In order to solve the above technical problems, this application adopts the following technical solutions:

[0005] An embodiment of one aspect of the present application proposes a mold adjustment oil circuit system, including: a motor, which can be used to drive a mold adjustment mechanism; a brake, which can be driven by hydraulic oil and can make at least two reactions according to the different hydraulic pressures acting on the brake, when the brake is in a first state where the hydraulic pressure is less than a preset value, the brake can be used to brake the mold adjustment mechanism, and when the brake is in a second state where the hydraulic pressure is greater than or equal to the preset value, the brake can stop braking the mold adjustment mechanism; a first hydraulic oil circuit, the motor is arranged in the first hydraulic oil circuit, the first hydraulic oil circuit has an input end for inputting hydraulic oil and an output end for discharging hydraulic oil; a second hydraulic oil circuit, connected to the first hydraulic oil circuit and the brake, and used to transfer hydraulic oil from the first hydraulic oil circuit to the brake; a pressure regulating member, configured to be able to adjust the hydraulic pressure of the second hydraulic oil circuit.

[0006] According to a technical solution of the present application, the pressure regulating component includes an overflow valve, the overflow valve is connected to the output end, and the overflow valve and the second hydraulic oil circuit are connected along the first hydraulic oil circuit.

[0007] According to a technical solution of the present application, the mold adjustment oil circuit system further includes: a throttle connected to the output end, and the throttle and the second hydraulic oil circuit are connected along the first hydraulic oil circuit.

[0008] According to a technical solution of the present application, the overflow valve is arranged in parallel with the throttle.

[0009] According to a technical solution of the present application, the mold adjustment oil circuit system also includes: a reversing valve, including a P end, a T end, an A end and a B end; the P end serves as the input end or is connected to the input end; the T end serves as the output end or is connected to the output end, the T end is connected to the overflow valve and to the throttle; the A end and the B end are respectively connected to the motor, so that the rotation direction of the motor is controlled by the reversing valve.

[0010] According to a technical solution of the present application, the second hydraulic oil circuit includes a shuttle valve, which is respectively connected to the A end, the B end and the brake, and the shuttle valve is configured to transfer hydraulic oil from the A end to the brake, and to transfer hydraulic oil from the B end to the brake.

[0011] According to a technical solution of the present application, the shuttle valve includes: a first port, connected to the A end; a second port, connected to the B end; a third port, connected to the brake; a first one-way valve, the first port is connected to the third port along the first one-way valve; a second one-way valve, the second port is connected to the third port along the second one-way valve.

[0012] According to a technical solution of the present application, the brake includes: a liquid inlet, which is connected to the second hydraulic oil circuit; a piston, which can move between a first position and a second position as the hydraulic pressure in the brake changes; a brake pad, which is transmission-connected to the piston, so that when the piston is located at the first position, the brake pad can hold the rotating shaft for driving the mold adjustment mechanism, and when the piston is located at the second position, the brake pad releases the rotating shaft; a spring, which abuts against the piston, so that when the piston is located at the second position, the spring is deformed, and the elastic force of the spring is used to drive the piston to the first position.

[0013] An embodiment of another aspect of the present application proposes a mold adjusting device, comprising: a mold adjusting mechanism, including a mold adjusting motor gear; the mold adjusting oil circuit system described in any of the above technical solutions, wherein the motor and the brake of the mold adjusting oil circuit system are associated with the mold adjusting motor gear, the mold adjusting motor gear can rotate under the drive of the motor, and the mold adjusting motor gear can be braked by the brake.

[0014] An embodiment of another aspect of the present application proposes a mold assembly, comprising: a mold; a locking mechanism, cooperating with the mold and used to provide a locking force to the mold; the mold adjustment device described in any of the above technical solutions, arranged on the locking mechanism or the mold, and configured to be used to adjust the locking force.

[0015] Another embodiment of the present application proposes an injection molding machine, comprising: a mold assembly as described in any of the above technical solutions; an injection molding device configured to heat a material and provide the material melt formed after heating to a mold of the mold assembly.

[0016] In the present application, a motor and a brake are provided in the mold adjustment oil circuit system. The brake is used to brake the mold adjustment mechanism, so that the mold adjustment mechanism can be self-locked by being braked by the brake, thereby more effectively and stably maintaining the clamping force, avoiding the problem of the mold expanding due to insufficient clamping force, and better ensuring the quality of injection molding production.

[0017] More specifically, the motor can rotate under the drive of the first hydraulic oil circuit, and the motor rotates to drive the mold adjustment mechanism to adjust the mold. The brake is driven by hydraulic pressure to switch the brake between the first state of braking and the second state of stopping braking, wherein the brake is connected to the first hydraulic oil circuit via the second hydraulic oil circuit, and a pressure regulating member is provided to adjust the hydraulic pressure of the second hydraulic oil circuit. In this way, the hydraulic pressure of the hydraulic oil from the first hydraulic oil circuit can be used to drive the brake more accurately and reliably, so as to adjust the state of the brake more accurately. In this way, the brake self-locking control of the mold adjustment mechanism can be reliably realized. At the same time, the brake state can be better associated with the motor state, so that the adaptability between product braking and mold adjustment is better, for example:

[0018] When mold adjustment is required, at least a portion of the hydraulic oil in the first hydraulic oil circuit can be supplied to the brake along the second hydraulic oil circuit, so that the brake is driven by a hydraulic pressure greater than or equal to a preset value, thereby switching the brake to a second state of stopping braking, and at least a portion of the hydraulic oil in the first hydraulic oil circuit can drive the motor to rotate, so that the mold adjustment mechanism is not braked, and the motor can effectively drive the mold adjustment mechanism to adjust the mold;

[0019] When mold adjustment is not required, the hydraulic pressure of the first hydraulic oil circuit acting on the brake along the second hydraulic oil circuit is less than a preset value, so that the brake is switched to the first state capable of braking the mold adjusting mechanism, and the first hydraulic oil circuit does not drive the motor. In this way, the motor will not drive the mold adjusting mechanism, and the mold adjusting mechanism is self-locking through the braking action of the brake, thereby better ensuring the stability of the clamping force.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0022] Figure 1 It is a schematic structural diagram of a mold adjustment device shown in one embodiment.

[0023] Figure 2 It is a schematic structural diagram of a mold adjustment device shown in one embodiment.

[0024] The following are the descriptions of the reference numerals:

[0025] Mold adjustment oil circuit system 10; motor 110; brake 120; liquid inlet 121; piston 122; brake pad 123; spring 124; first hydraulic oil circuit 130; reversing valve 131; input end 1311; output end 1312; second hydraulic oil circuit 140; shuttle valve 141; first port 1411; second port 1412; third port 1413; first check valve 1414; second check valve 1415; overflow valve 150; throttle 160; mold adjustment mechanism 20; mold adjustment motor gear 21; mold adjustment large gear 22; mold adjustment nut 23; mold adjustment oil circuit system 10'; motor 110'; reversing valve 131'; mold adjustment mechanism 20'; mold adjustment motor gear 21'. DETAILED DESCRIPTION

[0026] Although the present application can be easily embodied in different forms of embodiments, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary illustration of the principles of the present application and is not intended to limit the present application to that described herein.

[0027] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present application, rather than implying that each embodiment of the present application must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0028] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front, back, etc.) / positions (such as first position, second position, T, P, A, B, etc.) used to explain the structure and movement of various elements of the present application are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present application will be more comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0030] The preferred implementation methods of the present application are further described in detail below in conjunction with the drawings of this specification.

[0031] like Figure 1 As shown, an embodiment of one aspect of the present application provides a mold adjusting oil circuit system 10, which is used for a mold adjusting device and can be mainly used to drive and brake a mold adjusting mechanism 20 of the mold adjusting device.

[0032] The mold adjustment oil circuit system 10 includes a motor 110, a brake 120, a first hydraulic oil circuit 130, a second hydraulic oil circuit 140, a pressure regulating component, and the like.

[0033] Specifically, the motor 110 can be used to drive the mold adjustment mechanism 20. For example, the mold adjustment mechanism 20 includes a mold adjustment motor gear 21, and the motor 110 can be used to drive the mold adjustment motor gear 21 to rotate. For further example, a rotating shaft for transmission is provided between the motor 110 and the mold adjustment motor gear 21, and the motor 110 can drive the rotating shaft to rotate, and the mold adjustment motor gear 21 can rotate under the drive of the rotating shaft.

[0034] The brake 120 can be used to brake the mold adjustment mechanism 20. For example, the mold adjustment mechanism 20 includes a mold adjustment motor gear 21, and the brake 120 can brake the mold adjustment motor gear 21; or, the mold adjustment mechanism 20 can brake the rotating shaft used to drive the mold adjustment motor gear 21 to rotate, thereby braking the mold adjustment motor gear 21 accordingly; or, the mold adjustment mechanism 20 can brake the motor 110, thereby braking the mold adjustment motor gear 21 accordingly. In this way, the mold adjustment mechanism 20 can be self-locked by being braked by the brake 120, so that the clamping force can be maintained more effectively and stably, avoiding the problem of the mold expanding due to insufficient clamping force, and better ensuring the quality of injection molding production.

[0035] The brake 120 is configured to be driven by hydraulic oil and can make at least two reactions depending on the hydraulic pressure acting on the brake 120: 1) when the brake 120 is in a first state where the hydraulic pressure is less than a preset value, the brake 120 can be used to brake the mold adjustment mechanism 20; 2) when the brake 120 is in a second state where the hydraulic pressure is greater than or equal to the preset value, the brake 120 can stop braking the mold adjustment mechanism 20.

[0036] The first hydraulic oil circuit 130 has an input end 1311 for inputting hydraulic oil and an output end 1312 for discharging hydraulic oil. For example, the input end 1311 is used to communicate with an oil pump so that the first hydraulic oil circuit 130 can obtain hydraulic oil from the oil pump; the output end 1312 is used to communicate with an oil return tank so that the first hydraulic oil circuit 130 can discharge hydraulic oil into the oil return tank.

[0037] The motor 110 is disposed in the first hydraulic oil circuit 130. For example, the motor 110 is disposed in series on the first hydraulic oil circuit 130. In this way, when the hydraulic oil enters the first hydraulic oil circuit 130 from the input end 1311 and flows along the first hydraulic oil circuit 130 to the output end 1312, the motor 110 can be driven to rotate.

[0038] The second hydraulic oil circuit 140 is connected to the first hydraulic oil circuit 130 and the brake 120, and is used to transfer hydraulic oil from the first hydraulic oil circuit 130 to the brake 120. In this way, at least a portion of the hydraulic oil flowing along the first hydraulic oil circuit 130 can be directed to the brake 120 along the second hydraulic oil circuit 140, so that the brake 120 can be driven by the hydraulic pressure of the hydraulic oil from the first hydraulic oil circuit 130, so that the brake 120 can be switched between the first state of braking and the second state of stopping braking according to the difference in hydraulic pressure, thereby realizing the associated control of the brake 120 and the motor 110. In addition, the brake 120 and the motor 110 are both driven by the hydraulic oil of the first hydraulic oil circuit 130, so that the mold adjustment oil circuit system 10 is more streamlined while the brake 120 and the motor 110 are driven separately, and system redundancy is avoided.

[0039] The pressure regulating member is configured to be able to adjust the hydraulic pressure of the second hydraulic oil circuit 140. In this way, the hydraulic pressure for driving the brake 120 can be more accurately controlled by adjusting the hydraulic pressure of the second hydraulic oil circuit 140, so as to better ensure that the brake 120 can work normally, for example, better ensure that the brake 120 can accurately switch its state with the change of hydraulic pressure, or better ensure the stability of the hydraulic pressure at the brake 120, etc., so that the service life of the brake 120 can be longer, the brake 120 can work more accurately, reliably and stably, and the accuracy and stability of the working quality of the brake 120 can be guaranteed for a long time.

[0040] For example, the working conditions of the mold adjustment oil circuit system 10 may generally include:

[0041] When mold adjustment is required, at least a portion of the hydraulic oil in the first hydraulic oil circuit 130 can be supplied to the brake 120 along the second hydraulic oil circuit 140, so that the brake 120 is driven by a hydraulic pressure greater than or equal to a preset value, thereby switching the brake 120 to a second state of stopping braking, and at least a portion of the hydraulic oil in the first hydraulic oil circuit 130 can drive the motor 110 to rotate, so that the mold adjustment mechanism 20 is not braked, and the motor 110 can effectively drive the mold adjustment mechanism 20 to adjust the mold;

[0042] When mold adjustment is not required, the hydraulic pressure of the first hydraulic oil circuit 130 acting on the brake 120 along the second hydraulic oil circuit 140 is less than a preset value, so that the brake 120 is switched to the first state capable of braking the mold adjustment mechanism 20, and the first hydraulic oil circuit 130 does not drive the motor 110, so that the motor 110 does not drive the mold adjustment mechanism 20, and the mold adjustment mechanism 20 is self-locked through the braking action of the brake 120, so as to better ensure the stability of the clamping force.

[0043] Specific embodiment 1 (see Figure 1 ):

[0044] This specific embodiment provides a mold adjustment oil circuit system 10, which is used in a mold adjustment device.

[0045] It can be understood that the mold adjustment device includes a mold adjustment oil circuit system 10 and a mold adjustment mechanism 20. To facilitate understanding of the present solution, further examples of the mold adjustment mechanism 20 are provided as follows:

[0046] The mold adjustment mechanism 20 includes a mold adjustment motor gear 21, a mold adjustment large gear 22, a mold adjustment nut 23, etc. The mold adjustment large gear 22 is transmitted between the mold adjustment motor gear 21 and the mold adjustment nut 23, and is used to transmit torque to the mold adjustment mechanism 20. When the mold adjustment nut 23 rotates, the clamping force changes accordingly.

[0047] As the structure of this specific embodiment, the mold adjustment oil circuit system 10 includes a motor 110, a brake 120, a first hydraulic oil circuit 130, a second hydraulic oil circuit 140, a pressure regulating component, and the like.

[0048] When the mold adjusting oil circuit system 10 is applied to a mold adjusting device, two ends of the brake 120 are respectively connected to the output shaft end of the motor 110 and the mold adjusting motor gear 21 .

[0049] When the brake 120 is in a braking state, a rigid connection is substantially formed between the brake 120 and the mold adjusting motor gear 21, so that the rotation of the mold adjusting motor gear 21 is restricted by the brake 120. Correspondingly, the mold adjusting gear 22 and the mold adjusting nut 23 are also in a braked state because the mold adjusting motor gear 21 is braked.

[0050] When the brake 120 is not in a braking state, the brake 120 is open so that the mold-adjusting motor gear 21 is not braked by the brake 120 . At this time, the mold-adjusting motor gear 21 can rotate under the drive of the motor 110 .

[0051] Optionally, the brake 120 is a hydraulic brake.

[0052] For further example, the brake 120 specifically includes a fluid inlet 121, a brake pad 123, a piston 122, a spring 124, etc. The fluid inlet 121 is used to supply hydraulic oil into the brake 120. The piston 122 can move between a first position and a second position according to the difference in hydraulic pressure in the brake 120. Specifically, the piston 122 abuts against the spring 124, and the piston 122 is in transmission connection with the brake pad 123:

[0053] When the hydraulic pressure in the brake 120 is greater than or equal to a preset value, the hydraulic pressure will drive the piston 122 to move to the second position, and when the piston 122 is in the second position, the spring 124 is compressed by the piston 122, and the piston 122 drives the brake pad 123 to release the rotating shaft for driving the mold adjustment motor gear 21 to rotate. At this time, the brake 120 is in a non-braking state (i.e., the second state).

[0054] When the hydraulic pressure in the brake 120 is less than a preset value, the elastic force of the spring 124 causes the piston 122 to move to the first position, and when the piston 122 is in the first position, the piston 122 causes the brake pad 123 to hold the rotating shaft for driving the mold adjustment motor gear 21 to rotate. At this time, the brake 120 is in a braking state (i.e., the first state).

[0055] The first hydraulic oil circuit 130 includes a reversing valve 131 , an oil circuit a and an oil circuit b, etc.

[0056] Optionally, the reversing valve 131 is an electromagnetic reversing valve.

[0057] For further example, the reversing valve 131 includes a P end, a T end, an A end, and a B end. The a oil circuit is connected between the A end and one end of the motor 110, and the b oil circuit is connected between the B end and the other end of the motor 110. The P end is used as the input end 1311 of the first hydraulic oil circuit 130 for communicating with the oil pump, and the T end is used as the output end 1312 of the first hydraulic oil circuit 130 for communicating with the return oil tank. In this way, the reversing valve 131 can be used to control the motor 110 to switch between the state of liquid inletting from the A end and the state of liquid inletting from the B end, so as to adjust the direction of the motor 110 accordingly, so that the control of the mold adjustment mechanism 20 for switching between adjusting forward and adjusting backward can be realized accordingly, which is more convenient to use.

[0058] Specifically, when the mold is adjusted, the rotation direction of the motor 110 is controlled by the reversing valve 131, and the rotating motor 110 drives the mold adjustment motor gear 21, so that the mold adjustment motor gear 21 drives the mold adjustment nut 23 through the mold adjustment large gear 22, thereby adjusting the forward and backward movement of the mold plate to adjust the size of the clamping force.

[0059] The second hydraulic oil circuit 140 includes a shuttle valve and a C oil circuit, wherein the C oil circuit is connected between the shuttle valve and the liquid inlet 121 of the brake 120, the shuttle valve is connected to the A end, the B end and the brake 120 respectively, and the shuttle valve is configured to transfer hydraulic oil from the A end to the brake 120, and to transfer hydraulic oil from the B end to the brake 120. In this way, no matter the working condition of the reversing valve 131 supplying liquid from the A end or the B end, the hydraulic oil from the reversing valve 131 can be transferred to the brake 120 through the shuttle valve, thereby better ensuring the working reliability of the brake 120.

[0060] For further example, the shuttle valve includes: a first port 1411, a second port 1412, a third port 1413, a first check valve 1414, and a second check valve 1415. The first port 1411 is connected to the A end along the a path; the second port 1412 is connected to the B end along the b path; and the third port 1413 is connected to the brake 120 along the c path. Inside the shuttle valve, the first port 1411 is connected to the third port 1413 along the first check valve 1414; and the second port 1412 is connected to the third port 1413 along the second check valve 1415.

[0061] In a more specific example, the first one-way valve 1414 includes a movable spherical valve core and an elastic member abutting against the valve core. The elastic force of the elastic member is used to drive the valve core to a sealing position where the first one-way valve 1414 is in a cut-off state; when the hydraulic pressure of the liquid flowing from the first port 1411 to the third port 1413 is greater than or equal to the elastic force of the elastic member, the liquid flowing from the first port 1411 to the third port 1413 can drive the valve core to leave the sealing position, so that the first one-way valve 1414 is in a conducting state; when the hydraulic pressure of the liquid flowing from the first port 1411 to the third port 1413 is less than the elastic force of the elastic member, the valve core is in a sealing position under the action of the elastic member to prevent the liquid from flowing from the third port 1413 to the first port 1411.

[0062] Accordingly, the structure and state of the second one-way valve 1415 can be understood with reference to the above description of the first one-way valve 1414, which will not be repeated here.

[0063] Optionally, the regulating member includes a relief valve 150, the relief valve 150 is connected to the output end 1312, and the relief valve 150 and the second hydraulic oil circuit 140 are connected along the first hydraulic oil circuit 130. More specifically, for example, the relief valve 150 is connected to the T end, and in the reversing valve 131, the T end is connected to the A end, and the A end is connected to the c oil circuit along the a oil circuit and the shuttle valve, and / or the T end is connected to the B end, and the B end is connected to the c oil circuit along the b oil circuit and the shuttle valve. By adjusting the relief pressure of the relief valve 150, the hydraulic pressure in the c oil circuit and even the brake 120 can be adjusted accordingly. Of course, it can be understood that in other embodiments, the relief valve 150 can also be replaced by a pressure regulating valve that is arranged in the second hydraulic oil circuit 140 and can regulate the pressure of the second hydraulic oil circuit 140.

[0064] Further, the mold adjustment oil circuit system 10 further includes a throttle 160, which is connected to the output end 1312, and the throttle 160 and the second hydraulic oil circuit 140 are connected along the first hydraulic oil circuit 130. More specifically, for example, the throttle 160 is connected to the T end, and in the reversing valve 131, the T end is connected to the A end, and the A end is connected to the c oil circuit along the a oil circuit and the shuttle valve, and / or the T end is connected to the B end, and the B end is connected to the c oil circuit along the b oil circuit and the shuttle valve. The setting of the throttle 160 is beneficial to the hydraulic stability in the mold adjustment oil circuit system 10, and the throttle 160 can be used to quickly release the oil in the C oil circuit after the mold adjustment is completed, thereby reducing the hydraulic pressure value of the C oil circuit, so that the brake 120 can smoothly and quickly restore the braking state. In this way, the duration of the brake 120 restoring the braking state is shortened, and the clamping force changes generated during the brake 120 restoring the braking state can be responded to and reduced, so that the mold adjustment accuracy is higher and it is also beneficial to the stability of the clamping force.

[0065] Optionally, the throttle 160 is a throttle valve or a capillary tube.

[0066] Furthermore, the relief valve 150 is arranged in parallel with the throttle 160. In this way, the relief valve 150 can more accurately regulate the pressure of the oil circuit c.

[0067] Specific embodiment 2 (see Figure 2 ):

[0068] This specific embodiment provides a mold adjusting oil circuit system 10 ′, which is used for a mold adjusting device including the mold adjusting oil circuit system 10 ′ and a mold adjusting mechanism 20 ′.

[0069] The mold adjustment mechanism 20' includes a mold adjustment motor gear 210'. Of course, it may also include a mold adjustment gear and a mold adjustment nut.

[0070] The mold adjustment oil circuit system 10' includes a reversing valve 131' and a motor 110'. The motor 110' is connected to the mold adjustment motor gear 21' by transmission. The mold adjustment motor gear 21' can rotate under the drive of the motor 110'. The two ends of the motor 110' are correspondingly connected to the A end and the B end of the reversing valve 131'. The P end of the reversing valve 131' is used to connect the oil pump, and the T end of the reversing valve 131' is used to connect to the oil tank. When the mold is adjusted, the rotation direction of the motor 110' is controlled by the reversing valve 131'. The rotating motor 110' drives the mold adjustment motor gear 21' to rotate. The mold adjustment motor gear 21' rotates and further drives the mold adjustment nut through the mold adjustment gear, thereby adjusting the advance and retreat of the template to adjust the size of the clamping force.

[0071] Comparing the solutions of Specific Embodiment 1 with Specific Embodiment 2:

[0072] In the scheme of specific embodiment 2, due to the leakage effect of hydraulic oil between the motor 110' and the reversing valve 131', the mold adjustment oil circuit system 10' does not provide as much help for the stability of the clamping force as the scheme of specific embodiment 1. In this way, the clamping force basically needs to rely on the threaded self-locking between the mold adjustment nut and the machine guide column in the mold adjustment mechanism 20' to ensure stability. However, the self-locking ability of the threaded self-locking mechanism is not very reliable. Occasionally, the clamping force decreases during the production process, affecting the stability of the injection molded product.

[0073] In the scheme of the specific embodiment 1, the A and B ends of the reversing valve 131 are connected to the two ends of the motor 110 through hydraulic pipes a and b. A shuttle valve is arranged between the hydraulic pipes a and b, and the shuttle valve is connected to the brake 120 through the pipe c. The two ends of the brake 120 are respectively connected to the output shaft end of the motor 110 and the mold adjustment motor gear 21. The T end of the reversing valve 131 is connected to the overflow valve 150 back to the oil return tank, and the throttle 160 is connected in parallel at both ends of the overflow valve 150.

[0074] Under one working condition of the structure of specific embodiment 1, the brake 120 is in a braking state. In this state, the mold adjusting motor gear 21 is rigidly connected to the brake 120, so the mold adjusting motor gear 21 is also in a braking state. The mold adjusting large gear 22 is also in a braking state due to the gear matching with the mold adjusting motor gear 21. Therefore, the entire mold adjusting mechanism 20 is in a braking state as a whole due to the braking of the brake 120. The mold adjusting mechanism 20 cannot achieve relative displacement, thereby ensuring the stability of the clamping force. In this way, the problem of decreased clamping force that may be faced in specific embodiment 2 is correspondingly solved.

[0075] Under another working condition of the structure of the specific embodiment 1, when the clamping force needs to be adjusted, the reversing valve 131 controls the rotation of the motor 110 through the hydraulic pipelines a and b, and the oil in the hydraulic oil pipeline c opens the brake 120, so that the motor 110 can normally drive the mold adjustment motor gear 21. Among them, since the pressure value of pipeline c needs to be relatively high to open the brake 120, the pressure value of pipeline c can be controlled by adjusting the pressure value of the overflow valve 150, thereby ensuring that the brake 120 works normally and stably. In addition, through the throttle 160, the oil in the hydraulic pipeline c can be quickly released after the mold adjustment is completed, thereby quickly reducing the pressure value of pipeline c, so that the brake 120 can smoothly restore the braking state.

[0076] Another embodiment of the present application provides a mold adjusting device, including: a mold adjusting mechanism 20 and the mold adjusting oil circuit system 10 in any of the above embodiments.

[0077] Specifically, the mold adjustment mechanism 20 includes a mold adjustment motor gear 21. Of course, according to some other embodiments, the mold adjustment mechanism 20 may also include a mold adjustment large gear 22, a mold adjustment nut 23, etc. The motor 110 and the brake 120 of the mold adjustment oil circuit system 10 are associated with the mold adjustment motor gear 21. The mold adjustment motor gear 21 can rotate under the drive of the motor 110, and the mold adjustment motor gear 21 can be braked by the brake 120.

[0078] It is understandable that the structure and related description of the mold adjustment device provided in the embodiment of this aspect can be referred to in the attached Figure 1 Please refer to the specific embodiment 1 for understanding, and will not go into details here.

[0079] Another embodiment of the present application provides a mold assembly, including: a mold, a locking mechanism, and a mold adjustment device in any of the above embodiments. The mold can be injected with plastic melt so that the plastic melt is injection molded in the mold. The locking mechanism cooperates with the mold to provide a clamping force to the mold. The mold adjustment device is arranged on the locking mechanism or the mold and is configured to be used to adjust the clamping force.

[0080] In the mold assembly of the present application, when the mold adjusting device does not need to adjust the mold, the mold adjusting mechanism 20 of the mold adjusting device can be braked by the brake 120 of the mold adjusting oil circuit system 10, so that the mold adjusting mechanism 20 is self-locking, which can better maintain the stability of the clamping force.

[0081] The overflow valve 150 can realize accurate control of the hydraulic pressure of the brake 120, and better ensure accurate and reliable state switching of the brake 120. The throttle 160 can realize rapid pressure reduction at the brake 120 after the mold adjustment is completed, so as to make the mold adjustment more accurate.

[0082] Another embodiment of the present application provides an injection molding machine, comprising: a mold assembly and an injection molding device in any of the above embodiments. The injection molding device is configured to heat the material and provide the heated material melt to the mold of the mold assembly.

[0083] In the injection molding machine of the present application, when the mold adjusting device does not need to adjust the mold, the mold adjusting mechanism 20 of the mold adjusting device can be braked by the brake 120 of the mold adjusting oil circuit system 10, so that the mold adjusting mechanism 20 is self-locked, which can better maintain the stability of the clamping force.

[0084] Although the present application has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present application can be implemented in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above-mentioned embodiments are not limited to any of the foregoing details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A mold adjustment oil circuit system, characterized in that: include: A motor can be used to drive a mold adjustment mechanism; The brake can be driven by hydraulic oil and can make at least two reactions according to the different hydraulic pressures acting on the brake. When the brake is in a first state where the hydraulic pressure is less than a preset value, the brake can be used to brake the mold adjustment mechanism. When the brake is in a second state where the hydraulic pressure is greater than or equal to the preset value, the brake can stop braking the mold adjustment mechanism. a first hydraulic oil circuit, the motor being arranged in the first hydraulic oil circuit, the first hydraulic oil circuit having an input end for inputting hydraulic oil and an output end for discharging hydraulic oil; a second hydraulic oil circuit connected to the first hydraulic oil circuit and the brake, and used for transmitting hydraulic oil from the first hydraulic oil circuit to the brake; a pressure regulating member configured to be able to regulate the hydraulic pressure of the second hydraulic oil circuit; The pressure regulating member comprises a relief valve, the relief valve is connected to the output end, and the relief valve is connected to the second hydraulic oil circuit along the first hydraulic oil circuit; The mold adjustment oil circuit further includes a throttle, the throttle is connected to the output end, and the throttle is connected to the second hydraulic oil circuit along the first hydraulic oil circuit; The overflow valve is arranged in parallel with the throttle.

2. The mold adjustment oil circuit system according to claim 1, characterized in that: Also includes: A reversing valve, including a P end, a T end, an A end and a B end; The P terminal serves as the input terminal or is connected to the input terminal; The T end serves as the output end or is connected to the output end, and the T end is connected to the overflow valve and the throttle; The A end and the B end are respectively connected to the motor, so that the rotation direction of the motor is controlled by the reversing valve.

3. The mold adjustment oil circuit system according to claim 2, characterized in that: The second hydraulic oil circuit includes a shuttle valve, which is connected to the A end, the B end and the brake respectively, and the shuttle valve is configured to transfer hydraulic oil from the A end to the brake, and to transfer hydraulic oil from the B end to the brake.

4. The mold adjustment oil circuit system according to claim 3, characterized in that: The shuttle valve comprises: A first port, connected to the A end; A second port, connected to the B end; a third port, connected to the brake; a first one-way valve, wherein the first port is connected to the third port along the first one-way valve; A second one-way valve, the second port is communicated with the third port along the second one-way valve.

5. The mold adjustment oil circuit system according to claim 1, characterized in that: The brake comprises: a fluid inlet, connected to the second hydraulic oil circuit; a piston capable of moving between a first position and a second position in response to a difference in hydraulic pressure within the brake; A brake pad is drivingly connected to the piston, so that when the piston is located at the first position, the brake pad can hold the rotating shaft for driving the mold adjustment mechanism, and when the piston is located at the second position, the brake pad releases the rotating shaft; A spring abuts against the piston, and when the piston is located at the second position, the spring is deformed, and the elastic force of the spring is used to drive the piston to the first position.

6. A mold adjustment device, characterized in that: include: A mold adjustment mechanism, including a mold adjustment motor gear; According to any one of claims 1 to 5, the mold adjusting oil circuit system, the motor and the brake of the mold adjusting oil circuit system are arranged in association with the mold adjusting motor gear, the mold adjusting motor gear can rotate under the drive of the motor, and the mold adjusting motor gear can be braked by the brake.

7. A mold assembly, characterized in that: include: Mould; A locking mechanism, cooperating with the mold, for providing a clamping force to the mold; The mold adjustment device according to claim 6 is arranged on the locking mechanism or the mold and is configured to be used to adjust the clamping force.

8. An injection molding machine, characterized in that: include: The mold assembly according to claim 7; The injection molding device is configured to heat the material and provide the material melt formed after heating to the mold of the mold assembly.

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