A multi-color mold external rotation mechanism

Abstract

The present invention discloses an external rotation mechanism for a multi-color mold, which includes a control system, a driving component, a transmission component, a dynamic positioning component, and a rotating shaft; the rotating shaft is disposed through the mold mechanism, and is drivingly connected to the mold at the top, capable of driving the mold to rotate, and penetrates through the transmission component at the bottom and is cooperatively connected to the transmission component; the rotating shaft can axially move relative to the transmission component; the transmission component can radially limit the rotating shaft; the control system cooperates with the dynamic positioning component, capable of controlling the dynamic positioning component to cooperate with the transmission component, positioning the transmission component, and forming a positioning signal to be transmitted to the control system, and the control system controls the working state of the driving component according to the positioning signal; the driving component is drivingly connected to the transmission component, and drives the transmission component to drive the rotating shaft to rotate. This solution replaces the built-in rotation structure inside the mold, simplifies the mold structure, and reduces the manufacturing cost of the mold.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical manufacturing, and particularly relates to an external rotation mechanism for a multi-color mold. Background Art

[0002] With the continuous and rapid development of society, people's requirements for living standards are getting higher and higher, and the corresponding demands tend to be diversified and personalized. Plastic products made of a single raw material cannot meet the needs of appearance and function, so plastic products combined with two or three raw materials appear, that is, two-color or three-color plastic products, and thus two-color or three-color molds are also produced.

[0003] Traditional two-color molds adopt a rotation assembly with high-precision control by itself. The mold structure is complex, the design time is long, and the processing cost is high. Each two-color mold needs to be equipped with a rotation assembly by itself, with high repeatability, which increases unnecessary mold costs and waste.

[0004] Therefore, in order to reduce the mold cost and shorten the mold design and manufacturing cycle, the prior art discloses an external rotation mechanism, which is equipped with a rotation assembly by itself. Refer to Figures 1 - 2 , which includes an oil cylinder 1, a rack 2, a limit block 3, a gear 4, a rotating shaft 8, and two sets of forming mold cores 6.

[0005] Among them, due to the piston of the oil cylinder 1 driving the rack 2 to reciprocate linearly up and down a certain distance under the action of oil pressure and limited by the limit block 3, the gear 4 supported by the bearing 7 reciprocates 180° rotation, thereby driving the rotating shaft 8 to reciprocate 180° rotation, and the cross 5 and the forming mold core 6 also rotate following the rotating shaft.

[0006] The first forming is carried out at position one, and the second forming is carried out at position two. After each mold is formed, the semi-finished product at position one remains on the forming mold core 6, and the product formed at position two is ejected and taken away under the action of the ejector pin. Then, the forming mold cores 6 at position one and position two are rotated in position under the action of the rotation assembly. The semi-finished product at position one is transferred to position two and waits for the mold to be closed for forming. In this way, the forming operation is continuously cycled.

[0007] However, the existing rotation assembly with a rotation assembly by itself has a complex structure, is not compact, and occupies a large area.

[0008] It can be seen that there is an urgent need for a multi-color mold external rotation mechanism with a simple structure to solve the problems in this field. Summary of the Invention

[0009] Aiming at the technical problem of the complex structure of the existing external rotation mechanism, the purpose of the present invention is to provide an external rotation mechanism for a multi-color mold, and the external rotation mechanism for a multi-color mold has a simple structure and well overcomes the problems existing in the prior art.

[0010] To achieve the above object, a multi-color mold external rotation mechanism provided by the present invention includes a control system, a driving component, a transmission component, a dynamic positioning component, and a rotating shaft; the rotating shaft is disposed through the mold mechanism, and the top is drivingly connected to the mold, capable of driving the mold to rotate, and the bottom penetrates through the transmission component and is cooperatively connected to the transmission component; the rotating shaft can axially move relative to the transmission component; the transmission component can radially limit the rotating shaft; the control system cooperates with the dynamic positioning component, capable of controlling the dynamic positioning component to cooperate with the transmission component, positioning the transmission component, and forming a positioning signal to be transmitted to the control system, and the control system controls the working state of the driving component according to the positioning signal; the driving component is drivingly connected to the transmission component, driving the transmission component to drive the rotating shaft to rotate.

[0011] Further, the dynamic positioning component includes a power component, a gear block, and a plurality of induction blocks; the plurality of induction blocks are symmetrically arranged along the circumference of the fixing plate cooperated with the transmission component; the gear block is cooperatively connected to the driving component, and the driving component can drive the gear block to expand and contract and cooperate with the induction blocks on the fixing plate of the transmission component to form an induction signal.

[0012] Further, when the dynamic positioning component cooperates with the transmission component, when the rotation speed of the transmission component shows a downward trend and then slowly rotates to the set angle, the power component drives the gear block to sense the induction blocks on the transmission component, and performs an emergency stop positioning on the transmission component.

[0013] Further, the transmission component includes a fixing plate and a plurality of gears, and the plurality of gears are sequentially meshed and transmitted to form a transmission structure and are cooperatively arranged with the fixing plate.

[0014] Further, the rotating shaft sequentially penetrates through the gear assembly and the fixing plate and is connected to the fixing plate by setting a connecting member; the rotating shaft can drive the connecting member through the fixing plate to drive the rotating shaft to rotate, and the rotating shaft can axially move relative to the connecting member in the connecting member.

[0015] Further, a jacking component is provided at the bottom of the rotating shaft, and the jacking component is controlled by the control system, and the control system can drive the jacking component to jack up / pull back the rotating shaft.

[0016] Further, a limiting block is provided on the jacking component, and the limiting block limits the jacking stroke of the rotating shaft by the jacking component. When the stroke of the jacking component reaches the maximum value, the limiting block fits with the fixing plate.

[0017] The multi-color mold external rotation mechanism provided by the present invention replaces the self-rotating structure inside the mold, simplifies the mold structure, and reduces the manufacturing cost of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a top view of the structure of an existing self - contained rotating component;

[0020] Figure 2 It is a schematic bottom view of the structure of an existing self - contained rotating component;

[0021] Figure 3 It is an assembly schematic diagram of the external - mold rotation mechanism of this multi - color mold;

[0022] Figure 4 It is a schematic structural diagram of the external - mold rotation mechanism of this multi - color mold;

[0023] Figure 5 It is a schematic bottom view of the structure of the external - mold rotation mechanism of this multi - color mold;

[0024] Figure 6 It is a structural cross - sectional view of the external - mold rotation mechanism of this multi - color mold;

[0025] Figure 7 It is a schematic diagram of the state of the external - mold rotation mechanism of this multi - color mold when rotating;

[0026] Figure 8 It is a schematic diagram of the state of the external - mold rotation mechanism of this multi - color mold when the rotation stops.

[0027] The following is the component labeling description in the drawings:

[0028] 1. Oil cylinder 2. Rack 3. Limit block 4. Gear 5. Cross 6. Forming die core 7. Bearing 8. Rotating shaft

[0029] 100. Machine table moving die panel 200. External - mold rotation mechanism 300. Moving die

[0030] 210. Rotating shaft 211. Small gear 212. Intermediate gear 213. Large gear 214. Large gear fixing plate 215. Hexagonal bushing 220. Hydraulic motor 230. Oil cylinder 231. Gear position block 232. Induction block 240. Water jacket 241. Water jacket core 242. Connecting block 310. Cross 311. Forming die core. Specific embodiments

[0031] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0032] In view of the technical problem of the high cost of existing molds, the purpose of the present invention is to provide an external-rotation mechanism for a multi-color mold. By cooperating the external-rotation mechanism with a rotating assembly, the external-rotation mechanism is equipped with its own rotating assembly, so that the cost of machining the rotating assembly can be saved on the mold, greatly reducing the machining cost of the mold.

[0033] The external-rotation mechanism for a multi-color mold provided by this solution is fixed on an injection molding machine. Refer to Figure 3 , the whole tail of the external-rotation mechanism 200 of the multi-color mold is arranged on the moving mold panel 100 of the machine table, and the front part is cooperatively connected with the moving mold 300 of the multi-color mold.

[0034] There are two positioning holes with different sizes on the side of the moving mold 300 of the multi-color mold. Corresponding to this, there are two positioning posts defined by screws on the external-rotation mechanism 200 of the multi-color mold. The moving mold 300 is positioned by the positioning posts and locked on the external-rotation mechanism 200 of the multi-color mold with screws.

[0035] Refer to Figure 4 , among which, the moving mold 300 includes a cross 310 and two sets of molding cores 311.

[0036] The two sets of molding cores 311 are symmetrically arranged at both ends of the cross 310 and integrally connected with the transmission assembly. Through the transmission assembly, they can be driven to rotate, and the two sets of molding cores 311 can be turned around to perform position conversion between the mold in the first position of the moving mold and the mold in the second position of the moving mold.

[0037] The structure of the moving mold here is well-known to those skilled in the art and will not be elaborated here.

[0038] The external-rotation mechanism for a multi-color mold provided by this solution includes a control system, a driving assembly, a transmission assembly, a positioning assembly, and an ejection assembly.

[0039] The positioning assembly is arranged on the other side of the transmission assembly corresponding to the driving assembly and is controlled by the driving part.

[0040] Refer to Figure 5 , the positioning assembly is arranged on the other side of the transmission assembly corresponding to the driving assembly and is controlled by the control system. The positioning assembly includes a driving part, a blocking block 231, and several sensing blocks 232.

[0041] In some examples, the driving part can use an oil cylinder 230, and its telescopic rod is telescoped through the control system.

[0042] The blocking block 231 is arranged on the telescopic rod of the oil cylinder 230 and can move back and forth with the telescopic rod of the oil cylinder 230.

[0043] A number of induction blocks 232 are symmetrically distributed along the circumference of the fixed plate that the transmission component is fitted to, and the gear block 231 is connected in cooperation with the induction block 232.

[0044] At the same time, in some instances, two induction blocks 232 can be adopted, which are respectively symmetrically arranged on both sides of the fixed plate that the transmission component is fitted to, and correspond to the two sets of forming die cores 311 at the top.

[0045] Among them, when the large fixed plate rotates to the set angle end point, one of the induction blocks 232 just corresponds to the gear block 231 on the oil cylinder 230, and drives the gear block 231 to be positioned in cooperation with it.

[0046] The number of the induction blocks 232 here is not limited. The more the number, the more accurate the positioning.

[0047] When the gear block 231 and the induction block 232 are connected in cooperation, when the gear block 231 and the induction block 232 are in the first state, a stop signal is sent to the control system. At this time, the control system stops the drive of all power components and the rotation ends; if rotation is required, the gear block 231 and the induction block 232 can be driven by the control system to be in the second state, and then an opening signal can be sent to the control system, and then the oil pressure motor 220 is driven to work.

[0048] Here, the first state and the second state can refer to the mutual cooperation induction and separation of the induction block 232 and the gear block 231. The specific corresponding relationship between the first state and the second state and the cooperation and separation of the induction block 232 and the gear block 231 is not limited here and can be determined according to the actual situation.

[0049] When the gear block 231 and the induction block 232 are in cooperation induction, after the induction block 232 senses the gear block 231, it transmits the induction signal to the control system. At this time, after receiving the induction signal, the control system controls the drive component to rotate.

[0050] Furthermore, the drive component is drivingly connected to the transmission component to transmit the driving force to the transmission component for transmission; the drive component is controlled by the control system, and the rotation speed and rotation direction of the oil pressure motor 220 can be changed through the control system.

[0051] In some instances, the drive component can use an oil pressure motor and an electric motor.

[0052] However, the rotation function of using an electric motor can be achieved, but the existing control machine cannot control it, and the control system of the machine must be improved and upgraded, resulting in an additional increase in cost.

[0053] The hydraulic motor 220 can be used on the existing hydraulic double-color molding machine. The control system on the machine can directly control the angle required for the rotation of this structure and the position to be reached, without any modification or improvement to the machine.

[0054] Further, the transmission assembly includes a rotating shaft, a fixing plate, and several gears; the several gears are sequentially meshed and transmitted to form a transmission structure and are arranged in cooperation with the fixing plate.

[0055] The rotating shaft is disposed through the mold mechanism. The top of the rotating shaft is drivingly connected to the mold, and the bottom sequentially passes through the gears and the fixing plate, and can rotate radially and axially relative to the fixing plate.

[0056] In some examples, the transmission assembly includes a rotating shaft 210, a large gear fixing plate 214, a large gear 213, an intermediate gear 212, and a small gear 211. For the specific structure, please refer to Figure 4 and Figure 6 。

[0057] Among them, through holes are provided in both the large gear fixing plate 214 and the large gear 213. After the through holes in the large gear fixing plate 214 and the large gear 213 are aligned, they are arranged in mutual cooperation. The centers of the through holes in the middle of the large gear 213 and the through holes in the middle of the large gear fixing plate 214 are on the same axis.

[0058] Due to the mating connection between the large gear fixing plate 214 and the large gear 213, they can rotate synchronously.

[0059] The small gear 211 is connected to the driving assembly and can be rotated through the driving assembly.

[0060] The teeth of the small gear 211, the intermediate gear 212, and the large gear 213 are sequentially meshed, and a gear transmission assembly can be formed. The driving assembly drives the small gear 211, the intermediate gear 212, the large gear 213, and the large gear fixing plate 214 to rotate in sequence.

[0061] The rotating shaft 210 sequentially passes through the through holes in the centers of the large gear fixing plate 214 and the large gear 213 and is connected to the large gear fixing plate 214 by setting a connecting member. The rotating shaft can rotate radially and axially relative to the large gear fixing plate.

[0062] In some examples, a hexagonal shaft sleeve 215 can be sleeved on the rotating shaft 210 to connect the rotating shaft 210 and the large gear fixing plate 214 in a matching manner; the hexagonal shaft sleeve 215 is sleeved on the rotating shaft 210 and is connected to the large gear fixing plate 214 at the bottom.

[0063] Among them, clamping grooves are symmetrically arranged around the hexagonal bushing 215, and protruding structures corresponding to the clamping grooves are arranged around the rotating shaft 210. By arranging the protruding structures on the rotating shaft 210 inside the clamping grooves, axial movement can be carried out inside the clamping grooves, that is, the rotating shaft can axially move relative to the large gear fixing plate 214 and the large gear 213 within the hexagonal bushing 215.

[0064] At the same time, the clamping grooves on the hexagonal bushing 215 are engaged with the protruding structures on the rotating shaft 210, which can radially limit the rotating shaft 210.

[0065] Since the hexagonal bushing 215 is connected to the large gear fixing plate 214, the hexagonal bushing 215 can rotate synchronously with the large gear fixing plate 214. Furthermore, through the limit formed by the clamping grooves and the protruding structures on the rotating shaft 210, the rotating shaft 210 is driven to rotate synchronously.

[0066] The top of the rotating shaft 210 is drivingly connected to the fixed mold assembly for driving the two sets of forming die cores 311 on the fixed mold assembly to rotate.

[0067] When the oil pressure motor 220 drives the small gear 211, sequentially drives the intermediate gear 212, the large gear 213, the large gear fixing plate 214 and the rotating shaft 210 to rotate to about the specified angle, the frequency conversion is controlled by the control system to control the rotation speed of the oil pressure motor 220. That is, since the disc diameters of the small gear, the intermediate gear and the large gear increase in sequence, the speed of the large gear fixing plate can be controlled by the tooth number ratio of the gears with different sizes, and its rotation speed will immediately slow down rapidly.

[0068] In some instances, belt drive and chain drive can also be adopted for the transmission assembly, but they cannot be adopted in this rotating structure because during the mold forming production process, the mold has a temperature, and the heat will slowly transfer to this rotating structure. The temperature of this rotating structure is as high as 100°. In addition, since there is relative rotational movement inside this rotating structure, lubricating oil is applied to reduce friction.

[0069] Adopting belt drive: It cannot ensure an accurate transmission ratio, has a low transmission efficiency (about 0.90 - 0.94), the service life of the belt is short, and it is not suitable for use in high-temperature, flammable, and oil- and water-containing occasions.

[0070] Adopting chain drive: After the chain wears, the chain links become longer, and it is easy to produce chain derailment phenomena.

[0071] Therefore, gear drive is preferably adopted in this solution because the gear transmission ratio is constant, the transmission is stable and reliable, the transmission efficiency is high, and the service life is long.

[0072] At the same time, see Figure 6, a jacking assembly is provided at the bottom of the large gear fixing plate 214, and the jacking assembly can jack out or pull back the rotating shaft 210; the jacking assembly is controlled by a control system, and the jacking or contraction of the jacking assembly can be realized through the control system.

[0073] In some examples, the jacking assembly includes a driving member, a connecting block 242, and a water jacket core 241.

[0074] Among them, the water jacket core 241 is connected to the rotating shaft 210 and is connected to the driving member through the connecting block 242.

[0075] By the driving member pressing against the water jacket core 241, the water jacket core 241 is driven to jack up the rotating shaft 210, and the cross 310 on the rotating shaft 210 is jacked out, which is convenient for the rotation of the cross 310.

[0076] At the same time, a limiting assembly is also provided on the jacking assembly for limiting the jacking stroke of the jacking assembly for the rotating shaft 210. When the stroke of the jacking assembly reaches the maximum value, the jacking assembly fits with the large gear fixing plate 214.

[0077] In some examples, the limiting assembly can adopt a water jacket 240, and the water jacket 240 is arranged on the water jacket core 241. On the one hand, it can play a protective role for the water jacket core 241.

[0078] On the other hand, when the formation of the jacking assembly reaches the maximum value, the protruding parts at both ends of the water jacket 240 fit with the large gear fixing plate 214, which can limit the jacking stroke and ensure the reliability of the jacking assembly during the jacking process.

[0079] The following gives an example to illustrate the working process of this solution when in use; it should be noted here that the following content is only a specific application example of this solution and does not limit this solution.

[0080] For the multi-color mold external rotation mechanism composed of the above solution, first, refer to Figure 7 , the water jacket core 241 is pressed by the jacking assembly, and the water jacket core 241 is driven to press against the rotating shaft 210, and the rotating shaft 210 moves upward along the card slot on the hexagonal bushing 215, and the cross 310 on the rotating shaft 210 is jacked out.

[0081] Then, the oil cylinder 230 is controlled to contract through the control system, and the gear block 231 is driven by the control system to be withdrawn from the induction block 232 to disengage from the cavity. When the induction block 232 does not sense the gear block 231, a signal can be sent to the control system, and then the oil pressure motor 220 is driven to work.

[0082] The hydraulic motor 220 drives the pinion 211, the intermediate gear 212, the large gear 213 and the large gear fixing plate 214 to rotate in sequence. The large gear fixing plate 214 drives the rotating shaft 210 and the cross 310 on the rotating shaft 210 to rotate.

[0083] When the rotating shaft 210 rotates to nearly 180°, the rotation speed rapidly slows down. At the same time, the oil cylinder drives the gear block 231 to extend forward. When the sensing block 232 contacts the gear block 231, a signal is sent to the control system. At this time, the control system stops driving all the power components and the rotation ends.

[0084] See Figure 8 , after the rotation ends, the semi-finished product at position one on the cross 310 is rotated to position two, and the water jacket core 241 is pulled back through the ejection system. The rotating shaft 210, the cross 310 and the forming die core 311 on the cross 310 return to their original positions.

[0085] When it is pulled in place, the mold is closed and injection molding starts, starting the next cycle.

[0086] The external rotation mechanism for the multi-color mold composed of the above solution replaces the built-in rotation structure inside the mold, simplifies the mold structure and reduces the manufacturing cost of the mold.

[0087] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-color mold external rotation mechanism, characterized in that, It includes a control system, a driving component, a transmission component, a dynamic positioning component and a rotating shaft; the rotating shaft is disposed through the die mechanism, is drivingly connected to the die at the top, and can drive the die to rotate. The bottom penetrates through the transmission component and is cooperatively connected to the transmission component; the rotating shaft can axially move relative to the transmission component; the transmission component can radially limit the rotating shaft; the control system cooperates with the dynamic positioning component, can control the dynamic positioning component to cooperate with the transmission component, position the transmission component, and form a positioning signal to be transmitted to the control system. The control system controls the working state of the driving component according to the positioning signal; the driving component is drivingly connected to the transmission component and drives the transmission component to drive the rotating shaft to rotate; The dynamic positioning component includes a driving member, a blocking block and a plurality of sensing blocks; the plurality of sensing blocks are symmetrically arranged along the circumference of the fixing plate cooperated with the transmission component; the blocking block is cooperatively connected to the driving member, and the driving member can drive the blocking block to expand and contract and cooperate with the sensing blocks on the fixing plate of the transmission component to form a sensing signal.

2. The multi-color mold external rotation mechanism according to claim 1, wherein When the dynamic positioning component cooperates with the transmission component and the transmission component rotates slowly to a set angle after the rotational speed shows a downward trend, the driving member drives the blocking block to sense the sensing blocks on the transmission component to perform an emergency stop positioning on the transmission component.

3. A multi-color mold external rotation mechanism according to claim 1, characterized in that The transmission component includes a fixing plate and a plurality of gears, and the plurality of gears are sequentially meshed and transmitted to form a transmission structure and are cooperatively arranged with the fixing plate.

4. A multi-color mold external rotation mechanism according to claim 1, characterized in that, The rotating shaft sequentially penetrates through the gear assembly and the fixing plate and is connected to the fixing plate by setting a connecting member; the rotating shaft can drive the connecting member through the fixing plate to drive the rotating shaft to rotate, and the rotating shaft can axially move relative to the connecting member in the connecting member.

5. A multi-color mold external rotation mechanism according to claim 1, characterized in that, A jacking component is provided at the bottom of the rotating shaft, and the jacking component is controlled by the control system. The control system can drive the jacking component to jack up / pull back the rotating shaft.

6. The external rotation mechanism for a multi-color mold according to claim 5, wherein A limiting block is provided on the jacking component. The limiting block limits the jacking stroke of the rotating shaft by the jacking component. When the stroke of the jacking component reaches the maximum value, the limiting block fits with the fixing plate.

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