Double-pull-rod synchronous band-type brake structure and three-plate type injection molding machine

Abstract

The utility model relates to the field of injection molding machines, and discloses a double-pull-rod synchronous band-type brake structure and a three-plate type injection molding machine, the double-pull-rod synchronous band-type brake structure comprises a first fixed mold, a second fixed mold and a movable mold located between the first fixed mold and the second fixed mold, and four pull rods capable of partially penetrating through the second fixed mold and the movable mold are inserted into the four corners of the first fixed mold; the first fixed die is provided with two sets of double-pull-rod synchronous band-type brake structures to achieve fixed connection, the four pull rods are matched with the double-pull-rod synchronous band-type brake structures with every two horizontally or vertically adjacent pull rods as one set, each double-pull-rod synchronous band-type brake structure comprises two sets of cohesion nuts, each cohesion nut comprises an inner half nut and an outer half nut, and the inner half nuts and the outer half nuts are oppositely arranged. The clamping or loosening of the two groups of clamping nuts is synchronously controlled by the first driving assembly, and the mechanism can simultaneously drive the two clamping nuts to be close to or far away from each other through the arranged first driving assembly, so that control parts required for clamping or loosening the two pull rods are reduced, and the operation cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding machine field especially relates to a double pull rod synchronous clutch structure and three board formula injection molding machine. BACKGROUND

[0002] When using some larger special molds in injection molding machines and die casting machines, the mold cannot be placed into the injection molding machine through a lifting device such as a crane due to the limitation of the height space of the factory building, at this time, the mold can be installed by disassembling the pull rod.

[0003] A three-plate injection molding machine with a pull rod that can be automatically extracted and reset is disclosed in Chinese Patent No. CN212446067U, which includes a fixed mold plate and a rear mold plate arranged in parallel and spaced apart. A movable mold plate is arranged between the fixed mold plate and the rear mold plate, and the movable mold plate is connected to the rear mold plate through a crank connecting rod structure. The fixed mold plate and the rear mold plate are connected by four upper and lower pull rods. The movable mold plate is located between the fixed mold plate and the rear mold plate, and the movable mold plate and the rear mold plate are connected by a crank connecting rod mechanism. A mold locking oil cylinder is provided on the rear mold plate. A pull rod oil cylinder assembly is provided on the rear mold plate for pulling a single pull rod. A clutch oil cylinder assembly is provided on the end of the fixed mold plate away from the rear mold plate for clamping a single pull rod.

[0004] The above structure needs to first release the clamping of the pull rod by the clutch oil cylinder when the mold is installed between the fixed mold plate and the movable mold plate. Then, the pull rod is moved towards the rear mold plate by the pull rod oil cylinder assembly, so that the pull rod is separated from the fixed mold plate. At this time, the mold can be placed between the fixed mold plate and the movable mold plate. However, for some special-shaped molds, only one pull rod cannot be extracted to install the mold between the fixed mold plate and the movable mold plate. At this time, two pull rods need to be extracted. The existing structure is that one pull rod corresponds to one independent clutch oil cylinder assembly. The controller needs to control two clutch oil cylinder assemblies to realize synchronous operation, and two drive assemblies are needed to realize the clamping or loosening of the two clutch oil cylinder assemblies, which has a high operating cost. Utility model content

[0005] The utility model provides a three-plate injection molding machine with a synchronous double-extraction pull rod structure that can reduce operating costs.

[0006] To solve the above technical problems, the utility model solves the problems by the following technical solutions:

[0007] The application discloses a double-pull-rod synchronous holding brake structure, which comprises two groups of holding nuts, each of the holding nuts comprises an inner half nut and an outer half nut matched with the inner half nut to hold or release the pull rod, the holding or releasing of the two groups of holding nuts is synchronously controlled by a first driving assembly, the first driving assembly comprises two parallel moving plates, a telescopic driving assembly for driving the two moving plates to approach or move away from each other in the holding direction of the holding nuts, and two parallel driving rods, the two driving rods are respectively fixed on different moving plates and vertically inserted into the other moving plate, one end of each of the two driving rods is fixed on the outer half nut of different holding nuts and the other end is fixed on the inner half nut of the other group of holding nuts after penetrating through the inner half nut of the group of holding nuts, and the end parts of the fixed end and the telescopic end of the telescopic driving assembly are respectively fixed on different moving plates, and the holding center of the holding nut remains unchanged and is controlled by a limiting assembly.

[0008] By adopting the above scheme, the telescopic driving component can drive the two moving plates to approach or move away from each other, one driving rod is fixed on each of the two moving plates, so when the two moving plates approach or move away from each other, the moving plates will drive the driving rod fixed thereon to move, one end of each of the two driving rods is fixed on the outer half nut of different holding nuts and the other end is fixed on the inner half nut of the other group of holding nuts after penetrating through the inner half nut of the group of holding nuts, so when the driving rod moves, the outer half nut and the inner half nut of the two groups of holding nuts will approach or move away from each other to hold or release the two pull rods, thereby reducing the number of control components and lowering the operation cost.

[0009] Preferably, the limiting assembly comprises two outer limiting blocks for limiting the maximum opening stroke of the corresponding outer half nut and two inner limiting blocks for limiting the maximum opening stroke of the corresponding inner half nut.

[0010] By adopting the above scheme, the outer limiting blocks and the inner limiting blocks can limit the stroke of the outer half nut and the inner half nut respectively, so that the distance between the two when they move away from each other is the same as the distance between the two and the pull rod, thereby keeping the holding center unchanged when the outer half nut and the inner half nut approach each other to hold the pull rod.

[0011] Preferably, the telescopic driving assembly is a pneumatic cylinder, the cylinder body of the pneumatic cylinder is fixed on the side of any one of the moving plates far away from the other moving plate, and the end of the piston rod of the pneumatic cylinder is fixed on the other moving plate after penetrating through the moving plate fixed on the cylinder body.

[0012] By adopting the above scheme, the pneumatic cylinder can drive the moving plate to move, and when the moving plate moves, the driving rod fixed on the moving plate will move, and when the driving rod moves, the holding nut connected with the pull rod will move, thereby realizing the holding or releasing of the pull rod.

[0013] Preferably, the outer limit block and the inner limit block are vertically connected with guide plates at both ends, and the inner half nut and the outer half nut are guided to slide on the two guide plates at both ends.

[0014] By the two guide plates, the movement of the inner half nut and the outer half nut is guided when the cylinder pushes the inner half nut and the outer half nut to move.

[0015] A three-plate injection molding machine comprises a first fixed mold, a second fixed mold, and a movable mold between the two, four pull rods are inserted into the four corners of the first fixed mold and can partially pass through the second fixed mold and the movable mold, the first fixed mold and the pull rods are fixedly connected through two sets of double-pull rod synchronous brake structures, and the four pull rods are divided into two groups in a horizontal or vertical manner, and each group is matched with a double-pull rod synchronous brake structure.

[0016] By the above scheme, the double-pull rod brake structure arranged on the first fixed mold can simultaneously hold two pull rods, thereby reducing the driving components required when the brake structure holds the two pull rods, and reducing the control difficulty and operation cost of the controller.

[0017] Preferably, the second fixed mold is provided with a pulling structure for pulling the two pull rods away from the first fixed mold when the double-pull rod synchronous brake structure releases the two pull rods.

[0018] Preferably, the pulling structure comprises an inner threaded sleeve rotatably arranged in a pull rod hole of the second fixed mold, a threaded segment arranged at the end of the pull rod to be pulled and screwed with the inner threaded sleeve, and a gear ring coaxially fixed on the outer ring wall of the inner threaded sleeve and away from the first fixed mold at one end of the second fixed mold, two motors are fixed on the second fixed mold, a gear coaxially fixed with the corresponding gear ring is arranged on the motor shaft of the motor, and a connecting plate limiting the rotation of the two pull rods is fixed between the ends of the two pull rods to be pulled.

[0019] By the above scheme, when the motor is started, the gear ring between the gear on the motor shaft and the inner threaded sleeve is engaged, so that the inner threaded sleeve rotates on the second fixed mold after the motor is started, and because the ends of the two pull rods are connected through the connecting plate, when the inner threaded sleeve rotates, the pull rods move horizontally on the second fixed mold, so that the end of the pull rod close to the first fixed mold gradually moves away from the first fixed mold.

[0020] The utility model discloses a have remarkable technical effect through setting up telescopic drive part can drive two moving plate each other close or each other away, because two moving plate respectively fixed with a drive rod, so when two moving plate each other close or each other away, moving plate will drive and fix one drive rod of it and move, because one end of two drive rods respectively with the outer half nut of different embrace nut fixed, the other end passes through the inner half nut of this embrace nut and fixes with the inner half nut of another group embrace nut, so when drive rod moves, the outer half nut and inner half nut of two groups embrace nut will each other close embrace two pull rod or each other away and loosen two pull rod, thereby reduce the number of control component setting, reduce operating cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the axial measurement drawing of the three-plate type injection molding machine of the double pull rod synchronous brake structure in the embodiment;

[0022] Figure 2 is Figure 1 the enlarged view of A in

[0023] Figure 3 is the axial measurement drawing of the inner thread sleeve in the embodiment;

[0024] Figure 4 is the axial measurement drawing of the double pull rod synchronous brake structure in the embodiment;

[0025] Figure 5 is Figure 4 the enlarged view of B in

[0026] Figure 6 is the top view of the double pull rod synchronous brake structure embrace pull rod in the embodiment;

[0027] Figure 7 is Figure 6 the sectional view of C-C in

[0028] Figure 8 is the top view of the double pull rod synchronous brake structure loosen pull rod in the embodiment;

[0029] Figure 9 is Figure 8 the sectional view of D-D in

[0030] The part names referred to by the numbers in the above drawings are as follows: 1, first fixed mold; 2, second fixed mold; 3, movable mold; 4, pull rod; 5, embracing nut; 501, outer half nut; 502, inner half nut; 6, moving plate; 7, drive rod; 8, drive plate; 9, insertion slot; 10, inner limiting block; 11, outer limiting block; 12, air cylinder; 13, guide plate; 14, motor; 15, gear; 16, inner threaded sleeve; 17, toothed ring; 18, connecting plate; 19, threaded section. DETAILED DESCRIPTION

[0031] The utility model will be described in further detail below in combination with the drawings and embodiments.

[0032] EMBODIMENT

[0033] A double-pull rod synchronous embracing brake structure and a three-plate type injection molding machine, referring to Figures 1-9 , comprising a first fixed mold 1, a second fixed mold 2 and a movable mold 3 located between the two, four pull rods 4 partially penetrating through the second fixed mold 2 and the movable mold 3 are inserted at the four corners of the first fixed mold 1, the first fixed mold 1 and the pull rods 4 are fixedly connected through two groups of double-pull rod 4 synchronous embracing brake structures, the four pull rods 4 are matched with the double-pull rod 4 synchronous embracing brake structure in groups of two horizontally or vertically adjacent pull rods 4, the double-pull rod 4 synchronous embracing brake structure comprises two groups of embracing nuts 5, the embracing nut 5 comprises an inner half nut 502 and an outer half nut 501 arranged oppositely, the embracing or loosening of the two groups of embracing nuts 5 is synchronously controlled by a first drive assembly, the first drive assembly comprises two parallel moving plates 6, a telescopic drive assembly driving the two moving plates 6 to relatively approach or move away in the embracing direction of the embracing nut 5, and two parallel drive rods 7, the two drive rods 7 are each fixed on different moving plates 6 and vertically inserted into the other moving plate 6, the drive rod 7 and the moving plate 6 are fixed to each other through a fixed part, the fixed part comprises a drive plate 8 fixedly arranged on the outer wall of the drive rod 7 and an insertion slot 9 provided on the moving plate for partial insertion of the drive plate 8 and the drive rod 7, one end of each of the two drive rods 7 is fixed with the outer half nut 501 in a different embracing nut 5 and the other end is fixedly connected with the inner half nut 502 in the other group of embracing nuts 5 after penetrating through the inner half nut 502 in the group of embracing nuts 5, the fixed end and the end part of the telescopic drive assembly are respectively fixed on different moving plates 6, and the embracing center of the embracing nut 5 remains unchanged and is controlled by a limiting assembly.

[0034] Reference Figure 4 , Figures 6-9The limiting assembly includes two outer limiting blocks 11 for limiting the maximum opening stroke of the corresponding outer half nut 501 and two inner limiting blocks 10 for limiting the maximum opening stroke of the corresponding inner half nut 502. The two ends of the outer limiting blocks 11 and the inner limiting blocks 10 are vertically connected with guide plates 13. The two ends of the inner half nut 502 and the outer half nut 501 are guided to slide on the two guide plates 13. In this embodiment, the unilateral inner limiting blocks 10, the outer limiting blocks 11 and the two guide plates 13 are connected end to end to form an installation frame for installing the clamping nut 5.

[0035] With reference to Figure 4 The telescopic driving assembly is a cylinder 12. The cylinder body of the cylinder 12 is fixed on the side of any one of the moving plates 6 away from the other moving plate 6, and the piston rod end of the cylinder 12 is fixedly connected with the other moving plate 6 after penetrating through the moving plate 6 fixed with the cylinder body.

[0036] With reference to Figures 1-3 The second fixed mold 2 is provided with a pulling structure for pulling the two draw bars 4 away from the first fixed mold 1 when the synchronous brake structure of the two draw bars 4 is loosened. In this embodiment, the pulling structure is arranged above the second fixed mold 2 and is used for pulling the two draw bars 4 arranged horizontally and spaced apart above the first fixed mold 1. The pulling structure includes an inner threaded sleeve 16 rotatably arranged in the draw bar 4 hole of the second fixed mold 2, a threaded section 19 arranged at the end of the draw bar 4 to be pulled and screwed with the inner threaded sleeve 16, and a tooth ring 17 coaxially fixed on the outer ring wall of the inner threaded sleeve 16 and away from the first fixed mold 1. Two motors 14 are fixed on the second fixed mold 2. The motor shaft of the motor 14 is coaxially fixed with a gear 15 engaged with the corresponding tooth ring 17. A connecting plate 18 limiting the self-rotation of the two draw bars 4 is fixed between the ends of the two draw bars 4 to be pulled.

[0037] Specific extraction process: when the mold installed between the first die 1 and the moving die 3 needs to be replaced, first, start the cylinder 12, so that the extending end of the cylinder 12 gradually extends outward, at this time the extending end of the cylinder 12 will push the moving plate 6 fixed with the extending end of the cylinder 12 to move, so the moving plate 6 has a drive rod 7 fixed thereon, so when the moving plate 6 moves, the drive rod 7 fixed thereto will move, at this time the drive rod 7 will drive the outer half nut 501 and the inner half nut 502 in the different embracing nuts 5 connected with both ends thereof to move along the extending direction of the extending end of the cylinder 12, at the same time when the moving plate 6 fixed with the cylinder body of the cylinder 12 moves, the moving plate 6 fixed with the cylinder body of the cylinder 12 will be subjected to a reaction force and move away from the extending end of the cylinder 12, thereby driving the remaining outer half nut 501 and the inner half nut 502 in the different embracing nuts 5 to move in the opposite direction of the extending direction of the extending end of the cylinder 12, so as to realize the mutual movement of the outer half nut 501 and the inner half nut 502 in the two embracing nuts 5, thereby loosening the two draw bars 4, then, at the same time, the two motors 14 provided on the second die 2 are started, so that the gear 15 on the output shaft of the motor 14 drives the inner nut sleeve provided with the tooth ring 17 to rotate on the second die 2, because the ends of the two draw bars 4 are connected to each other through a connecting plate 18, the two draw bars 4 cannot rotate with the inner threaded sleeve 16, and because the draw bar 4 is provided with a threaded section 19 matched with the inner threaded sleeve 16, the draw bar 4 will move away from the first die 1, at this time the mold between the first die 1 and the moving die 3 can be removed for replacement; when the mold replacement is completed, first, the two motors 14 provided on the second die 2 are started at the same time, so that the gear 15 on the output shaft of the motor 14 rotates in the opposite direction, at this time the draw bar 4 will move towards the first die 1 until it is inserted into the embracing nut 5, and when the draw bar 4 is inserted into the embracing nut 5, the extending end of the cylinder 12 can be controlled to retract, at this time the drive rod 7 will drive the outer half nut 501 and the inner half nut 502 in the two groups of embracing nuts 5 to move towards each other, thereby embracing and fixing the draw bar 4.

[0038] The preferred embodiments of the present application have been described above, the protection scope of the present application is not limited to the above-mentioned embodiments, any technical solutions falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principles of the present application shall also be considered as the protection scope of the present application.

Claims

1. A double-pull rod synchronous brake structure, comprising two groups of embracing nuts (5), the embracing nut (5) comprising an inner half nut (502) arranged oppositely and an outer half nut (501) cooperating with the inner half nut (502) to embrace or loosen the pull rod (4), characterized in that: The two groups of embracing nuts (5) are embraced or loosened synchronously under the control of the first driving assembly, the first driving assembly comprises two parallel arranged moving plates (6), a telescopic driving assembly driving the two moving plates (6) to relatively close or move away along the embracing direction of the embracing nuts (5), and two parallel arranged driving rods (7), the two driving rods (7) are respectively fixed on different moving plates (6) and vertically inserted into the other moving plate (6), one end of the two driving rods (7) is respectively fixed with the outer half nut (501) in different embracing nuts (5) and the other end is fixed and connected with the inner half nut (502) in the other group of embracing nuts (5) after penetrating the inner half nut (502) in the group of embracing nuts (5), the fixed end and the end part of the telescopic driving assembly are respectively fixed on different moving plates (6), the embracing center of the embracing nut (5) remains unchanged and is controlled by a limiting assembly.

2. The dual-pull rod synchronized holding brake structure according to claim 1, wherein: The limiting assembly comprises two outer limiting blocks (11) respectively used for limiting the maximum opening stroke of the corresponding outer half nut (501) and two inner limiting blocks (10) respectively used for limiting the maximum opening stroke of the corresponding inner half nut (502).

3. The dual-pull rod synchronized holding brake structure according to claim 1, wherein: The telescopic driving assembly is a gas cylinder (12), the cylinder body of the gas cylinder (12) is fixed on the side of any one moving plate (6) away from the other moving plate (6) and the piston rod end of the gas cylinder (12) is fixed and connected with the other moving plate (6) after penetrating the moving plate (6) with the fixed cylinder body.

4. The dual-pull rod synchronized holding brake structure according to claim 2, wherein: The two ends of the outer limiting block (11) and the inner limiting block (10) are vertically connected with the guide plates (13), and the two ends of the inner half nut (502) and the outer half nut (501) are respectively guided and slid on the two guide plates (13).

5. A three-plate injection molding machine comprising a first fixed mold (1), a second fixed mold (2) and a movable mold (3) located therebetween, four pull rods (4) being inserted at the four corners of the first fixed mold (1) and being partially passed through the second fixed mold (2) and the movable mold (3), characterized in that: The first fixed mold (1) and the pull rod (4) are fixedly connected through two groups of double pull rod synchronous embracing structures as claimed in any one of claims 1-4, and four pull rods (4) are matched with the double pull rod synchronous embracing structure as a group in a horizontal or vertical adjacent manner.

6. A three-plate injection molding machine according to claim 5, characterized in that: The second fixed mold (2) is provided with a pulling structure for pulling out the two pull rods (4) away from the first fixed mold (1) when the double pull rod synchronous embracing structure loosens the two pull rods (4).

7. A three-plate injection molding machine according to claim 6, characterized in that: The pulling structure comprises an inner threaded sleeve (16) rotatably arranged in the pull rod (4) hole of the second fixed mold (2), a threaded segment (19) arranged at the end of the pull rod (4) to be pulled and screwed with the inner threaded sleeve (16), and a tooth ring (17) coaxially fixed on the outer ring wall of the inner threaded sleeve (16) and away from the first fixed mold (1) end of the second fixed mold (2), two motors (14) are fixed on the second fixed mold (2), a gear (15) engaged with the corresponding tooth ring (17) is coaxially fixed on the motor shaft of the motor (14), and a connecting plate (18) limiting the self-rotation of the two pull rods (4) is fixed between the ends of the two pull rods (4) to be pulled.

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