Die clamping device

Abstract

The utility model discloses a mold clamping device. The mold clamping device is used for quickly clamping a plastic injection mold on an injection molding machine. According to the utility model, the die clamping device comprises a motor with a shaft extending along a longitudinal axis, a mandrel assembled with the shaft of the motor, a nut actuated by the mandrel along the longitudinal axis, a pressing block moving along a locking axis perpendicular to the longitudinal axis, a shell for accommodating the motor, a base with a T-shaped beam, and a first bearing for supporting the mandrel. The housing is configured to guide the nut along the longitudinal axis and to guide the briquetting along the locking axis. The nut comprises a first inclined surface and a second inclined surface, and the first inclined surface and the second inclined surface are matched with the third inclined surface and the fourth inclined surface of the pressing block respectively and are used for enabling the pressing block to move along the locking axis. The utility model provides a die clamping device which is small in element number, compact in structure and capable of clamping various dies.

Description

Technical Field

[0001] The invention relates to a mold clamping device. Background Art

[0002] From CN-A-105583642, it is known to provide a clamping device, which includes a housing, an actuator fixed at one end of the housing, and a pressure block movably arranged at the other end of the housing. The clamping device also includes a first push block, which is retained in the base and fixedly connected to the actuator, and is provided with a first inclined wall; the pressure block includes a second push block, and the second push block is provided with a second inclined wall that is slidably matched with the first inclined wall. The actuator can drive the first push block to move in the longitudinal direction, so that the first inclined wall pushes the second inclined wall, so as to drive the pressure block to move in the vertical direction and squeeze the workpiece.

[0003] This clamping device is simple, but extends too much along the longitudinal axis.

[0004] The utility model aims to provide a mold clamping device which has a small number of parts and is very compact along its longitudinal axis. Utility Model Content

[0005] According to the utility model, the mold clamping device includes a motor having a shaft extending along a longitudinal axis, a spindle assembled with the shaft of the motor, a nut actuated by the spindle along the longitudinal axis, a pressure block moving along a locking axis perpendicular to the longitudinal axis, a housing for accommodating the motor, a base with a T-shaped beam, and a first bearing supporting the spindle. The housing is configured to guide the nut along the longitudinal axis and guide the pressure block along the locking axis. The nut includes a first inclined surface and a second inclined surface, and the first inclined surface and the second inclined surface respectively cooperate with the third inclined surface and the fourth inclined surface of the pressure block to move the pressure block along the locking axis. The third inclined surface and the fourth inclined surface of the pressure block are respectively located at the ends of the first arm and the second arm of the pressure block extending parallel to the locking axis on both sides of the spindle.

[0006] According to another aspect of the present invention, in a plane perpendicular to the longitudinal axis, a straight line connecting the tips of the cross sections of the first arm and the second arm of the pressure block intersects the cross section of the threaded portion of the mandrel.

[0007] According to another aspect of the present invention, the first arm and the second arm of the pressing block include tenons which slide in grooves of the housing, and the grooves are openly formed on the bottom surface of the housing.

[0008] According to another aspect of the utility model, the first spring acts between the pressure block and the first spring stopper, the second spring acts between the pressure block and the second spring stopper, and the first spring stopper and the second spring stopper are both fixed on the shell and are used to push the pressure block into the shell along the locking axis.

[0009] According to another aspect of the present invention, the housing has a front opening opposite to the motor and is closed by a front plate.

[0010] According to another aspect of the invention, a bearing ensures the articulation of the spindle in the front plate.

[0011] According to another aspect of the utility model, the spindle has an axial channel extending along the longitudinal axis, the axial channel is open at the front end of the spindle, and is open at least one radial channel, which is open at the threaded portion of the spindle, wherein the grease nipple of the front plate is aligned with the longitudinal axis to transmit lubricating oil / grease in the axial channel.

[0012] According to another aspect of the present invention, the angles between the first inclined surface, the second inclined surface, the third inclined surface, the fourth inclined surface of the nut and the pressure block and the longitudinal axis are between 3 degrees and 15 degrees, preferably between 8 degrees and 12 degrees.

[0013] According to another aspect of the present invention, the first bearing is an axial thrust bearing.

[0014] According to another aspect of the present invention, the nut and the spindle are threadedly connected so that movement of the nut is irreversible. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model will combine Figures 1 to 5 The preferred embodiment of the present invention is described in detail. However, the embodiment is not intended to limit the scope of the present invention in any way. In the accompanying drawings:

[0016] Figure 1 A three-dimensional view of a mold clamping device according to the present invention is shown.

[0017] Figure 2 Shows Figure 1 Exploded view of the center mold clamping device.

[0018] Figure 3 It shows that when the mold is unlocked, the Figure 1 A cross-sectional view of the plane of the longitudinal axis and the locking axis of the mold clamping device.

[0019] Figure 4 It shows that in the mold locked state, along the Figure 1 A cross-sectional view of the plane of the longitudinal axis and the locking axis of the mold clamping device.

[0020] Figure 5 A cross-sectional view along a plane perpendicular to the longitudinal axis is shown.

[0021] Figure 6A partial section AA is shown. DETAILED DESCRIPTION

[0022] Figure 1 A mold clamping device 1 is shown, which includes a motor 10 having a shaft 101 extending along a longitudinal axis X10, a pressure block 13 movable along a locking axis X13 perpendicular to the longitudinal axis X10, a housing 14 accommodating the motor 10, and a base 15 having a T-beam 151.

[0023] Figure 2 1 is an exploded view showing the components of the clamping device 1. The motor 10 has a shaft 101 extending along a longitudinal axis X10. The spindle 11 is assembled with the shaft 101 at one end and has a threaded portion 1110 at the other end that cooperates with a corresponding thread of the nut 12. The spindle 11 is hinged in the housing with a first bearing 16, which is supported on the surface of the housing 14 on one side and on the flange 111 of the spindle 11 on the other side. In the embodiment described, the first bearing 16 is an axial thrust bearing, but a radial bearing can also be selected.

[0024] The nut 12 is guided along the longitudinal axis X10 in the groove 141 of the housing 14. When the shaft 101 of the motor 10 rotates, the nut 12 moves along the longitudinal axis X10. Opposite to the longitudinal groove 141 of the housing 14, the nut has a first recess 124 on one side and a second recess 125 on the other side. The first recess 124 and the second recess 125 are both opposite relative to a longitudinal plane P100 containing the longitudinal axis X10 and the locking axis X13. They are defined by a first inclined surface 1241 and a second inclined surface 1251 in the direction of the locking axis, respectively.

[0025] The pressure block 13 is U-shaped with a first arm 134 and a second arm 135. The first arm 134 has a tenon 1343 on its outside, which is guided in a groove 1443 of the housing 14, which extends parallel to the locking axis X13. The first arm 134 is delimited at its end by a third inclined surface 1341 configured to cooperate with the first inclined surface 1241 of the nut 12.

[0026] The second arm 135 is symmetrical to the first arm 134 with respect to the longitudinal plane P100 and has a tenon 1344 guided in a groove 1444 of the housing 14 extending parallel to the locking axis X13. The second arm 135 is defined at its end by a fourth inclined surface 1351 configured to cooperate with the second inclined surface 1251 of the nut 12.

[0027] The first inclined surface 1241, the second inclined surface 1251 of the nut 12, and the third inclined surface 1341 and the fourth inclined surface 1351 of the pressing block 13 are flat and defined by an inclined plane P200 perpendicular to the longitudinal plane P100. Figure 6 As shown, the angle α between the inclined plane P200 and the longitudinal axis X10 is comprised between 3 and 15 degrees, preferably between 8 and 12 degrees.

[0028] The pressure block 13 has a flat bottom surface 136 protruding from the bottom surface 146 of the housing 14. The first spring 171 acts between the pressure block 13 and the first spring stopper 181, and the second spring 172 acts between the pressure block 13 and the second spring stopper 182. The first spring stopper 181 and the second spring stopper 182 are both fixed to the bottom surface 146 of the housing 141 by screws, and are used to push the pressure block 13 into the interior of the housing along the locking axis X13, so that the first inclined surface 1241 of the nut 12 abuts against the third inclined surface 1341 of the pressure block 13, and the second inclined surface 1251 of the nut abuts against the fourth inclined surface 1351 of the pressure block 13.

[0029] Thus, when the spindle 12 rotates in one direction, the nut 12 moves along the longitudinal axis and, due to the matching inclined surfaces, drives the pressure block 13 along the locking axis X13. When the spindle 11 rotates in the opposite direction, the pressure block moves along the locking axis due to the first spring 171 and the second spring 172.

[0030] Figure 5 A cross-sectional view along a plane perpendicular to the longitudinal axis is shown. A line L1 connecting the tips of the portions of the first arm 134 and the second arm 135 of the press block 13 intersects a portion of the threaded portion 1110 of the spindle 11. For each plane perpendicular to the longitudinal axis X10, a straight line connecting the tips of the cross-sections of the first arm 134 and the second arm 135 of the press block 13 intersects a cross-section of the threaded portion 1110 of the spindle 11. In other words, the first arm 134 and the second arm 135 of the press block 13 extend parallel to the locking axis X13 on both sides of the spindle 11. This allows the mold clamping device to be very compact because the spindle passes through the press block 13.

[0031] The housing 14 has a front opening 145 opposite to the motor 10. The front plate 19 is fixed to the housing 14 with screws and closes the front opening 145.

[0032] Figure 3is a cross-sectional view along the longitudinal plane P100 in the mold unlocked state and shows that the second bearing 20 ensures the articulation of the spindle 11 in the front plate 19. The spindle 11 has an axial channel 115, which extends along the longitudinal axis X10 and opens to the front end of the spindle 11. A grease nipple 119 is threaded at the entrance of the axial channel 115 and protrudes outside the electric clamping device 1 through a hole in the front plate 19. On the motor side, the axial channel 115 communicates with a first radial channel 1161 and a second radial end / channel 1162, which open on the threaded portion 1110 of the spindle 11. By such an axial channel 115 and the first radial channel 1161 and the second radial channel 1162, the threaded portion 1110 of the spindle 11 is effectively and easily lubricated.

[0033] Figure 3 and Figure 4 The mold locking process is shown. The mold has a mold plate 2, which is to be clamped on the injection molding machine frame 3. In the first stage of the clamping process, Figure 3 As shown, the electric clamping device 1 is in an unlocked state. The first proximity sensor 148 detects the nut 12 in its rear position. The nut 12 is in its rear position, so the pressure block 13 is in a position where the distance between the pressure surface 136 and the injection molding machine frame is greater than the thickness of the mold plate 2. The electric clamping device 1 is away from the position that fixes the mold plate 2 on the injection molding machine frame 3. Once the mold plate 2 is correctly placed on the injection molding machine frame, the electric clamping device 1 is pushed against the mold plate 2. The motor 10 is powered and drives the nut 12 in a forward position where the pressure block 13 presses the mold plate 2.

[0034] like Figure 4 As shown, in the final stage of the clamping process, the electric clamping device 1 is in a locked state. The nut 12 is in its forward position, so the pressing block 13 is in a position where the pressing surface 136 presses the mold plate 2. In the locked state of the electric clamping device 1, the T-shaped beam 151 of the base presses against the opposite surface of the T-shaped groove 31 of the injection molding machine frame. The second proximity sensor 149 detects that the nut 12 is in its forwardmost position and allows the power supply of the motor 10 to be cut off.

[0035] The nut 12 and the spindle 11 are threadedly connected in such a way that the movement of the nut 12 is irreversible. In other words, the rotation of the spindle 11 drives the nut 12 along the longitudinal axis X10, but it is not possible to rotate the spindle 11 to push or pull the nut 12 along the longitudinal axis X10. Therefore, it is not necessary to have a brake on the motor 10 to keep the electric clamping device 1 in the locked state.

[0036] Assembly reference for electric clamping device Figure 214. The base 15 and the T-beam 151 are fixed to the housing 14 by screws 1471. The grease nipple 21, the first bearing 16 and the second bearing 20 are assembled on the spindle 11. The nut 12 is screwed on the threaded portion 1110 of the spindle 11. The assembled spindle is placed into the housing 14 through the front opening 145. The front plate 19 is placed on the front opening 145 and fixed with screws 1451. The pressure block 13 is inserted into the groove 1444 and the groove 1443. The first spring 171 is installed in the housing 14 in contact with the pressure block 13, and the first spring stopper is fixed to the bottom surface 146 of the housing 14 with screws 1461. The second spring 172 is installed in the housing 14 in contact with the pressure block 13, and the second spring stopper 182 is fixed to the bottom surface 146 of the housing 14 with screws 1461.

Claims

1. A mold clamping device (1), characterized in that: The invention comprises a motor (10), the motor (10) having a shaft (101) extending along a longitudinal axis (X10); a spindle (11), the spindle (11) being assembled with the shaft (101) of the motor; a nut (12), the nut (12) being actuated by the spindle (11) along the longitudinal axis; a pressure block (13), the pressure block (13) moving along a locking axis (X13) perpendicular to the longitudinal axis; a housing (14) accommodating the motor (10); a base (15), the base (15) having a T-shaped beam (151); a first bearing (16), the first bearing (16) supporting the spindle (11); and a bearing configured to guide the nut (12) along the longitudinal axis, And for guiding the pressure block along the locking axis; wherein the nut (12) includes a first inclined surface (1241) and a second inclined surface (1251), and the first inclined surface (1241) and the second inclined surface (1251) respectively cooperate with the third inclined surface (1341) and the fourth inclined surface (1351) of the pressure block (13) to move the pressure block (13) along the locking axis, wherein the third inclined surface (1341) and the fourth inclined surface (1351) of the pressure block are respectively located at the ends of the first arm (134) and the second arm (135) of the pressure block (13) extending parallel to the locking axis on both sides of the spindle (11).

2. The mold clamping device (1) according to claim 1, characterized in that: In a plane perpendicular to the longitudinal axis (X10), a straight line connecting the cross-sectional tips of the first arm (134) and the second arm (135) of the pressing block (13) intersects the cross-sectional area of ​​the threaded portion (1110) of the mandrel (11).

3. The mold clamping device (1) according to claim 1 or 2, characterized in that: The first arm (134) and the second arm (135) of the pressing block include tenons (1343, 1344) that slide in grooves (1443, 1444) of the housing (14), and the grooves are openly formed on the bottom surface (146) of the housing (14).

4. The mold clamping device (1) according to claim 1 or 2, characterized in that: The first spring (171) acts between the pressure block (13) and the first spring stopper (181), and the second spring (172) acts between the pressure block (13) and the second spring stopper (182). Both the first spring stopper (181) and the second spring stopper (182) are fixed on the housing (141) and are used to push the pressure block (13) into the interior of the housing along the locking axis (X13).

5. The mold clamping device (1) according to claim 1 or 2, characterized in that: The housing (14) has a front opening (145) opposite to the motor (10) and is closed by a front plate (19).

6. The mold clamping device (1) according to claim 5, characterized in that: A second bearing (20) ensures the articulation of the spindle (11) in the front plate (19).

7. The mold clamping device (1) according to claim 5, characterized in that: The spindle (11) has an axial channel (115) extending along the longitudinal axis (X10), the axial channel opening at the front end of the spindle (11) and opening at least one radial channel (116), the at least one radial channel opening at the threaded portion (1110) of the spindle (11), wherein a grease nipple (21) is provided at the front end of the spindle (11) for conveying lubricating oil in the axial channel (115).

8. The mold clamping device (1) according to claim 1 or 2, characterized in that: An angle between the first inclined surface (1241), the second inclined surface (1251), the third inclined surface (1341), and the fourth inclined surface (1351) of the nut and the pressure block and the longitudinal axis is between 3 degrees and 15 degrees.

9. The mold clamping device (1) according to claim 1 or 2, characterized in that: The angle between the fourth inclined surface (1351) and the longitudinal axis is between 8 degrees and 12 degrees.

10. The mold clamping device (1) according to claim 1 or 2, characterized in that: The first bearing (16) is an axial thrust bearing.

11. The mold clamping device (1) according to claim 1 or 2, characterized in that: The nut (12) and the spindle (11) are threadedly connected so that the movement of the nut (12) is irreversible.

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