Locking mechanism for upper mold and lower mold of rotational molding mold

Abstract

The utility model relates to the technical field of rotational molding molds, in particular to a locking mechanism for an upper mold and a lower mold of a rotational molding mold. The die comprises an upper die body and a lower die body, a flange plate is arranged on the upper die body, the flange plate is provided with threaded holes which are coaxially formed, two clamping plates are arranged on the flange plate in a relatively sliding mode, and fixing blocks are arranged on the two clamping plates in a sliding mode; a connecting frame is arranged on the lower die, a fixing rod is arranged on the connecting frame in a sliding mode, an external thread sleeve is rotationally arranged on the fixing rod and is in threaded connection with the threaded hole, and a spring a is arranged between the connecting frame and the fixing rod. According to the utility model, the fixing rod is fixed by moving the clamping plate, so that the upper die and the lower die are locked together, and the production cost of workpieces is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of rotational molding molds, in particular to an upper and lower mold locking mechanism for a rotational molding mold. Background Art

[0002] Rotational molding is a process for forming hollow plastic products. Metered liquid or powdered plastic is added into a mold. After the mold is closed, it rotates while being heated. The plastic raw material in the mold will uniformly melt and adhere to the inner surface of the mold cavity under the action of gravity and heat energy, thus forming the same shape as the mold cavity. After cooling, demolding is carried out to obtain the required hollow product.

[0003] Chinese Patent Publication No. CN221291997U discloses an automatic opening, closing and pressing device for a rotational molding mold, belonging to the technical field of rotational molding molds. The rotational molding mold includes an upper mold and a lower mold. An upper mold frame is provided on the upper mold, and a lower mold frame is provided on the lower mold. It includes an opening and closing mechanism and a plurality of pressing mechanisms. The opening and closing mechanism includes at least two opening and closing driving cylinders, and the opening and closing driving cylinders are arranged on the lower mold frame. The pressing driving cylinder is arranged on the lower mold frame. This technical solution has a simple structure and is convenient to operate. It not only realizes the automatic opening and closing of the rotational molding mold, but also realizes the automatic pressing of the mold, and also realizes the automatic auxiliary demolding of the rotational molding product, which can save a large amount of manpower and time, and the rotational molding production is more efficient and convenient.

[0004] However, the above technical solution has the following problems: When the rotational molding mold produces products, external force is usually required to heat the mold. When the device locks the mold, the heating usually affects the opening and closing driving cylinder or the pressing driving cylinder, thereby reducing the service life of the driving cylinder and increasing the production cost of the workpiece. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problems in the background art, and propose an upper and lower mold locking mechanism for a rotational molding mold that reduces the production cost of the mold by moving a clamping plate to fix a fixing rod and locking the upper and lower molds together.

[0006] The technical solution of the utility model, an upper and lower mold locking mechanism for a rotational molding mold, includes: an upper mold, on which a flange is provided. The flange has coaxially arranged threaded holes. Two clamping plates are slidably arranged on the flange. A fixing block is slidably arranged on the two clamping plates; a lower mold, on which a connecting frame is provided. A fixing rod is slidably arranged on the connecting frame. An external thread sleeve is rotatably arranged on the fixing rod. The external thread sleeve is threadedly connected with the threaded hole. A spring a is arranged between the connecting frame and the fixing rod.

[0007] Preferably, the connecting frame includes a flange portion arranged on the lower mold and a receiving frame portion coaxially arranged on the flange portion. The receiving frame portion has a receiving groove, and the spring a is located in the receiving groove.

[0008] Preferably, the fixing rod includes a handle portion, a mounting rod portion provided on the handle portion, a limiting disc portion and a fixing rod portion provided on the mounting rod portion. The outer peripheral surface of the fixing rod portion has a plurality of limiting grooves arranged in a ring shape.

[0009] Preferably, the clamping plate has a fixing groove, and a plurality of limiting block portions are provided at the fixing groove. The plurality of limiting block portions are respectively and correspondingly clamped with the plurality of limiting grooves.

[0010] Preferably, the clamping plate has a sliding groove which is in an L shape. A roller is rotatably provided on the fixing block, and the roller is in rolling contact with the sliding groove.

[0011] Preferably, two limiting rods are oppositely arranged on the flange plate, and a spring b is arranged between the limiting rod and the clamping plate.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] When the utility model is used, a worker presses the fixing rod to move upward towards the upper die. During the movement of the external thread sleeve on the fixing rod, it is threadedly connected with the threaded hole. Then, the two clamping plates clamp the part of the fixing rod extending out of the flange plate, and the fixing block is used to move the clamping plate. Then, when the mold is heated to manufacture a workpiece, the clamping plate and the fixing block expand under the heat, so that the fixing relationship between the clamping plate and the fixing block becomes closer, reducing the situation that the upper die and the lower die are disengaged due to insecure fixation during the working of the mold. Then, after the production is completed, the worker moves the fixing block to increase the distance between the two clamping plates, and then the spring a drives the fixing rod to reset, thus reducing the production cost of the workpiece while ensuring the disassembly speed of the mold. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of an embodiment of the utility model;

[0015] Figure 2 is a sectional view of an embodiment of the utility model;

[0016] Figure 3 is a schematic structural diagram of the clamping plate, the fixing block and the roller in an embodiment of the utility model;

[0017] Figure 4 is a schematic structural diagram of the clamping plate, the limiting rod and the spring b in an embodiment of the utility model.

[0018] Reference numerals: 1, upper die; 2, lower die; 3, connecting frame; 31, flange portion; 32, storage rack portion; 4, fixing rod; 41, handle portion; 42, mounting rod portion; 43, limiting disk portion; 44, fixing rod portion; 5, spring a; 6, external thread sleeve; 7, flange; 8, clamping plate; 81, sliding groove; 9, fixing block; 10, roller; 11, limiting rod; 12, spring b. Detailed implementation mode

[0019] Embodiment 1

[0020] As Figures 1-4 shown, a locking mechanism for the upper and lower dies of a rotational molding die proposed in this embodiment includes an upper die 1 and a lower die 2. A flange 7 is provided on the upper die 1. The flange 7 has a threaded hole arranged coaxially. Two clamping plates 8 are slidably arranged on the flange 7. A fixing block 9 is slidably arranged on the two clamping plates 8. A connecting frame 3 is provided on the lower die 2. The connecting frame 3 includes a flange portion 31 arranged on the lower die 2 and a storage rack portion 32 arranged coaxially on the flange portion 31. The storage rack portion 32 has a storage groove. The spring a 5 is located in the storage groove. A fixing rod 4 is slidably arranged on the connecting frame 3. An external thread sleeve 6 is rotatably arranged on the fixing rod 4. The external thread sleeve 6 is threadedly connected to the threaded hole. A spring a 5 is arranged between the connecting frame 3 and the fixing rod 4.

[0021] When this embodiment is in use, a worker presses the fixing rod 4 to move towards the upper die 1. The external thread sleeve 6 on the fixing rod 4 is threadedly connected to the threaded hole during the movement. Then the two clamping plates 8 clamp the part of the fixing rod 4 extending out of the flange 7, and the fixing block 9 is used to move the clamping plate 8. Then when the die is heated to manufacture a workpiece, the clamping plate 8 and the fixing block 9 expand under the heat, so that the fixing relationship between the clamping plate 8 and the fixing block 9 becomes closer, reducing the situation that the upper die and the lower die are disengaged due to insecure fixing during the working of the die. Then after the production is completed, the worker moves the fixing block 9 to increase the distance between the two clamping plates 8, and then the spring a 5 drives the fixing rod 4 to reset, thereby reducing the production cost of the workpiece while ensuring the disassembly speed of the die.

[0022] Embodiment 2

[0023] As Figure 1 、 Figure 2 and Figure 4 shown, a locking mechanism for the upper and lower dies of a rotational molding die proposed in this embodiment, compared with Embodiment 1, in this embodiment, the fixing rod 4 includes a handle portion 41, a mounting rod portion 42 arranged on the handle portion 41, a limiting disk portion 43 and a fixing rod portion 44 arranged on the mounting rod portion 42. The outer peripheral surface of the fixing rod portion 44 has a plurality of limiting grooves arranged in a ring shape. The clamping plate 8 has a fixing groove. A plurality of limiting block portions are arranged at the fixing groove. The plurality of limiting block portions are respectively and correspondingly clamped with the plurality of limiting grooves.

[0024] In this embodiment, the worker holds the handle part 41 and moves it towards the upper die 1 until the spring a5 is compressed to the position where it cannot be compressed. At the same time, the worker moves the two clamping plates 8 towards each other until the limiting block parts are respectively clamped with the limiting grooves, so as to prevent the fixing rod 4 from resetting. Then, the position of the clamping plate 8 is restricted by the fixing block 9, so as to ensure the stability of the locking mechanism.

[0025] Embodiment III

[0026] As Figures 2-4 shown, a locking mechanism for the upper and lower dies of a rotational molding mold proposed in this embodiment, compared with Embodiment I, in this embodiment, the clamping plate 8 has a sliding groove 81, and the sliding groove 81 is L-shaped. A roller 10 is rotatably arranged on the fixing block 9, and the roller 10 is in rolling contact with the sliding groove 81. Two limiting rods 11 are oppositely arranged on the flange plate 7, and a spring b12 is arranged between the limiting rod 11 and the clamping plate 8.

[0027] When this embodiment is used, if it is desired to increase the distance between the two clamping plates 8, the worker pulls the fixing block 9 upwards until it reaches the height where it cannot rise further. Then, the two clamping plates 8 move away from each other under the push of the spring b12 until the two clamping plates 8 abut against the fixing block 9. If it is desired to decrease the distance between the two clamping plates 8, the two clamping plates 8 are made to abut against each other, and then the fixing block 9 is pressed downwards. The roller 10 can increase the friction between the fixing block 9 and the clamping plate 8, thereby increasing the speed at which the worker disassembles the mold.

[0028] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited thereto. Various changes can be made without departing from the spirit of the present utility model within the scope of knowledge possessed by those skilled in the art to which the present utility model pertains.

Claims

1. A locking mechanism for the upper and lower molds of a rotational molding mold, characterized in that, Comprising: An upper die (1) is provided with a flange (7) thereon. The flange (7) has threaded holes arranged coaxially. Two clamping plates (8) are slidably arranged on the flange (7), and a fixing block (9) is slidably arranged on the two clamping plates (8); A lower die (2) is provided with a connecting frame (3) thereon. A fixing rod (4) is slidably arranged on the connecting frame (3). An external thread sleeve (6) is rotatably arranged on the fixing rod (4). The external thread sleeve (6) is threadedly connected to the threaded hole. A spring a (5) is arranged between the connecting frame (3) and the fixing rod (4).

2. The upper and lower die locking mechanism of a rotational molding mold according to claim 1, characterized in that, The connecting frame (3) includes a flange portion (31) arranged on the lower die (2) and a storage rack portion (32) coaxially arranged on the flange portion (31). The storage rack portion (32) has a storage groove. The spring a (5) is located in the storage groove.

3. The upper and lower die locking mechanism of a rotational molding mold according to claim 1, characterized in that The fixing rod (4) includes a handle portion (41), a mounting rod portion (42) arranged on the handle portion (41), a limiting disc portion (43) and a fixing rod portion (44) arranged on the mounting rod portion (42). The outer peripheral surface of the fixing rod portion (44) has a plurality of limiting grooves arranged in a ring shape.

4. The upper and lower die locking mechanism of a rotational molding die according to claim 3, characterized in that, The clamping plate (8) has a fixing groove, and a plurality of limiting block portions are arranged at the fixing groove. The plurality of limiting block portions are respectively and correspondingly clamped with the plurality of limiting grooves.

5. The upper and lower die locking mechanism of a rotational molding mold according to claim 1, characterized in that, The clamping plate (8) has a sliding groove (81). The sliding groove (81) is L-shaped. A roller (10) is rotatably arranged on the fixing block (9). The roller (10) is in rolling contact with the sliding groove (81).

6. The upper and lower die locking mechanism of a rotational molding mold according to claim 5, characterized in that, Two limiting rods (11) are oppositely arranged on the flange (7). A spring b (12) is arranged between the limiting rod (11) and the clamping plate (8).

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