Sand casting mold for EGR valve production

Abstract

The invention provides a sand casting mold for EGR valve production, and relates to the field of valve production equipment, the sand casting mold comprises a placing base, a lower mold arranged at the top of the placing base and an upper mold arranged above the lower mold, and a positioning and assembling mechanism used for rapid matching is arranged between the upper mold and the lower mold. According to the sand casting mold for EGR valve production, through the arrangement of the placing base, the lower mold, the upper mold and the positioning assembly mechanism, the lower mold is installed on the placing base, then sand is injected into the upper and lower casting molds for mold forming, and the upper and lower casting molds are assembled; the upper casting mold and the lower casting mold are rapidly positioned, assembled and fixed through the positioning and assembling mechanism, then metal liquid is injected through the casting openings, valve casting is completed, and the upper mold and the lower mold can be separated and disassembled by screwing out the bolts.

Description

Technical Field

[0001] The invention relates to the technical field of valve production equipment, in particular to a sand casting mould for EGR valve production. Background Art

[0002] Sand casting is a casting method that produces castings in sand molds. Steel, iron and most nonferrous alloy castings can be obtained by sand casting. Since the molding materials used in sand casting are cheap and easy to obtain, the mold is easy to manufacture, and it can adapt to the single-piece production, batch production and mass production of castings, it has long been the basic process in casting production. Sand casting molds are needed in the production and processing of EGR valves, which are common equipment in the production process of EGR valves.

[0003] In the prior art, the sand casting mold has the following problems during use: the detachable sand casting mold has poor stability, and the non-detachable sand casting mold is inconvenient to place and it is not convenient to quickly take out the workpiece. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a sand casting mold for EGR valve production, which solves the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a sand casting mold for EGR valve production, including a placement base, a lower mold arranged on the top of the placement base, and an upper mold arranged above the lower mold, and a positioning assembly mechanism for quick matching is arranged between the upper mold and the lower mold.

[0008] Preferably, a casting port is fixedly connected to the top center of the upper mold, and the casting port is connected to the interior of the upper mold.

[0009] Preferably, the positioning assembly mechanism includes an upper positioning block, a lower positioning block, a positioning ring, a positioning groove, a bolt, a through hole, and a screw hole. The upper positioning block is welded to the upper mold, and the lower positioning block is welded to the lower mold. The lower positioning block and the upper positioning block correspond to each other. The top of the lower positioning block is fixedly connected with a positioning ring. The upper positioning block is provided with a positioning groove matching the positioning ring, the upper positioning block is provided with a through hole, and the lower positioning block is provided with a screw hole. The axes of the through hole, the screw hole and the positioning ring coincide with each other, and the bolt passes through the through hole and then the thread fits into the screw hole.

[0010] Preferably, the top of the positioning ring is provided with a rounded corner, and the edge of the positioning groove is provided with a rounded corner.

[0011] Preferably, the positioning assembly mechanisms are arranged on four sides of the upper mold and the lower mold, and two are arranged on each side.

[0012] Preferably, the placement base is provided with a connecting mechanism for adapting to various molds with different side lengths, the connecting mechanism comprising a bottom plate, a turntable, a drive motor, an arc groove, a slider, a sliding hole, a first transverse connecting rod, a second transverse connecting rod, a vertical connecting rod, and a plug-in sleeve, the bottom plate is fixedly connected to the bottom of the placement base, the top of the bottom plate is rotatably connected to the turntable, and the axis of the turntable passes through the midpoint of the top surface of the placement base, the drive motor is fixedly connected to the placement base, and the output end of the drive motor is connected to the center of the turntable, sliding holes matching the first transverse connecting rod are provided on the four surfaces of the placement base, the first transverse connecting rod is fixedly connected to a slider at one end inside the placement base, the turntable is provided with an arc groove corresponding to the slider one by one, the slider slidably fits in the arc groove, and the first transverse connecting rod extends to the outside of the placement base. One end is fixedly connected to the vertical Connecting rod, the top end of the vertical connecting rod is fixedly connected with a second transverse connecting rod, the first transverse connecting rod and the second transverse connecting rod are parallel to each other, and the center line of the first transverse connecting rod intersects with the axis of the turntable, and the four surfaces of the lower mold are fixedly connected with a plug sleeve, the position of the plug sleeve corresponds to the second transverse connecting rod, and the plug sleeve is provided with a plug interface matching the second transverse connecting rod. When the driving motor drives the turntable to rotate forward, the turntable drives the sliding block that slides inside through the arc groove so as to synchronously drive the four first transverse connecting rods to move outward, and the first transverse connecting rod drives the second transverse connecting rod to move outward through the vertical connecting rod. When the driving motor drives the turntable to rotate reversely, the turntable drives the sliding block that slides inside through the arc groove so as to synchronously drive the four first transverse connecting rods to move inward, and the first transverse connecting rod drives the second transverse connecting rod to move inward through the vertical connecting rod.

[0013] Preferably, guide plates are symmetrically fixedly connected to both sides of the plug interface of the plug sleeve, and a smooth layer is fixedly connected to the guide plates.

[0014] Preferably, an anti-skid layer is fixedly connected to the inner wall of the plug interface of the plug sleeve, and an anti-skid pattern is formed on the end of the second transverse connecting rod.

[0015] Preferably, the length of the second transverse connecting rod is smaller than that of the first transverse connecting rod, and the diameter of the turntable is smaller than the side length of the placement base.

[0016] (III) Beneficial effects

[0017] The present invention provides a sand casting mold for EGR valve production. It has the following beneficial effects:

[0018] 1. The sand casting mold for the production of the EGR valve is provided with a placement base, a lower mold, an upper mold and a positioning assembly mechanism. The lower mold is installed on the placement base, and then the upper and lower casting molds are injected with sand to form a mold, and the upper and lower casting molds are closed. The upper and lower casting molds are quickly positioned, assembled and fixed by the positioning assembly mechanism, and then the metal liquid is injected through the casting port to complete the valve casting. The upper mold and the lower mold can be separated and disassembled by screwing out the bolts, so that the cast valve can be conveniently taken out. After assembly, the stability is good under the action of the placement base and the positioning assembly mechanism, and the workpiece is easy to take out, and the use effect is good.

[0019] 2. The sand casting mold for the production of the EGR valve is set up with a connecting mechanism. Due to the different valve models, the side length of the mold will also be different. When it is necessary to replace the mold with different side lengths, the upper and lower molds are separated, and then the drive motor is turned on to drive the turntable to rotate forward. The turntable drives the sliding block that slides with the internal slider through the arc groove to synchronously drive the four first transverse connecting rods to move outward. The first transverse connecting rod drives the second transverse connecting rod to move outward through the vertical connecting rod, so that the four second transverse connecting rods are synchronously driven to withdraw from the plug sleeve, and then the lower mold with different side lengths is replaced, and the drive motor drives the turntable to rotate in the opposite direction. The turntable drives the sliding block inside through the arc groove to synchronously drive the four first transverse links to move inwards, and the first transverse links drive the second transverse links to move inwards through the vertical links until the end of the second transverse links is fully inserted into the plug-in sleeve again, thereby completing the fixation of the lower mold. The split design of the upper and lower molds can not only cooperate with the placement base, so that the entire mold does not need to be replaced together when replacing, thus reducing physical exertion, but also different lower molds can be conveniently replaced on the placement base according to the specifications of the product, and production needs can be quickly adjusted according to customer orders.

[0020] 3. The sand casting mold for the production of the EGR valve can play a guiding role when replacing the lower mold through the setting of the guide plate. It only needs to be roughly positioned. Even if there is a slight deviation, the lower mold will be automatically aligned under the action of the guide plate until the second transverse connecting rod is inserted into the plug-in sleeve, thereby preventing the second transverse connecting rod from being aligned with the plug-in interface of the plug-in sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a front view of the structure of the present invention;

[0023] Figure 3 The exploded diagram of the base structure of the present invention is placed;

[0024] Figure 4This is a schematic diagram of the bottom plate structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the positioning assembly mechanism structure of the present invention;

[0026] Figure 6 For the present invention Figure 1 A magnified view of the structure in the middle.

[0027] In the figure: 1 bottom plate, 2 placement base, 3 lower mold, 4 upper mold, 5 casting port, 6 positioning assembly mechanism, 7 vertical connecting rod, 8 first transverse connecting rod, 9 second transverse connecting rod, 10 sliding hole, 11 driving motor, 12 turntable, 13 arc groove, 14 slider, 15 plug sleeve, 16 guide plate, 61 lower positioning block, 62 upper positioning block, 63 positioning ring, 64 positioning groove, 65 through hole, 66 screw hole, 67 bolt. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] The embodiment of the present invention provides a sand casting mold for EGR valve production, such as Figure 1-6 As shown, it includes a placement base 2, a lower mold 3 arranged on the top of the placement base 2, an upper mold 4 arranged above the lower mold 3, and a positioning assembly mechanism 6 for quick matching is arranged between the upper mold 4 and the lower mold 3.

[0030] A casting port 5 is fixedly connected to the top center of the upper mold 4 , and the casting port 5 is communicated with the interior of the upper mold 4 .

[0031] In some embodiments, Figure 5 As shown, the positioning assembly mechanism 6 includes an upper positioning block 62, a lower positioning block 61, a positioning ring 63, a positioning groove 64, a bolt 67, a through hole 65, and a screw hole 66. The upper positioning block 62 is welded to the upper mold 4, and the lower positioning block 61 is welded to the lower mold 3. The lower positioning block 61 and the upper positioning block 62 correspond to each other. The top of the lower positioning block 61 is fixedly connected with the positioning ring 63. The upper positioning block 62 is provided with a positioning groove 64 matching the positioning ring 63. The upper positioning block 62 is provided with a through hole 65. The lower positioning block 61 is provided with a screw hole 66. The axes of the through hole 65, the screw hole 66 and the positioning ring 63 coincide with each other. The bolt 67 passes through the through hole 65 and then is threadedly engaged with the screw hole 66.

[0032] By setting up the placement base 2, the lower mold 3, the upper mold 4 and the positioning assembly mechanism 6, the lower mold 3 is installed on the placement base 2, and then the upper and lower casting molds are injected with sand to form a mold, the upper and lower casting molds are closed, and the upper and lower casting molds are quickly positioned, assembled and fixed by the positioning assembly mechanism 6, and then the metal liquid is injected through the casting port 5 to complete the valve casting, and the upper mold 4 and the lower mold 3 can be separated and disassembled by unscrewing the bolts 67, so that the cast valve can be conveniently taken out. After assembly, under the action of the placement base 2 and the positioning assembly mechanism 6, the stability performance is good, and the workpiece is easy to take out, and the use effect is good.

[0033] The top of the positioning ring 63 is provided with a rounded corner, and the edge of the positioning groove 64 is provided with a rounded corner.

[0034] The positioning assembly mechanisms 6 are arranged on four sides of the upper mold 4 and the lower mold 3 , and two positioning assembly mechanisms are arranged on each side.

[0035] In some embodiments, Figure 3-4As shown, the placement base 2 is provided with a connecting mechanism for adapting to various molds with different side lengths, the connecting mechanism includes a bottom plate 1, a turntable 12, a drive motor 11, an arc groove 13, a slider 14, a sliding hole 10, a first transverse connecting rod 8, a second transverse connecting rod 9, a vertical connecting rod 7, and a plug-in sleeve 15. The bottom plate 1 is fixedly connected to the bottom of the placement base 2, the top of the bottom plate 1 is rotatably connected to the turntable 12, and the axis of the turntable 12 passes through the midpoint of the top surface of the placement base 2, the drive motor 11 is fixedly connected to the placement base 2, and the output end of the drive motor 11 is connected to the center of the turntable 12, sliding holes 10 matching the first transverse connecting rod 8 are provided on the four surfaces of the placement base 2, the first transverse connecting rod 8 is fixedly connected to the slider 14 at one end inside the placement base 2, the turntable 12 is provided with an arc groove 13 corresponding to the slider 14 one by one, the slider 14 is slidably fitted in the arc groove 13, and the first transverse connecting rod 8 extends to the end outside the placement base 2 and is fixedly connected to the vertical connecting rod 7. The top of the vertical connecting rod 7 is fixedly connected with the second transverse connecting rod 9, the first transverse connecting rod 8 and the second transverse connecting rod 9 are parallel to each other, and the center line of the first transverse connecting rod 8 intersects with the axis of the turntable 12. The four surfaces of the lower mold 3 are fixedly connected with the plug-in sleeve 15, the position of the plug-in sleeve 15 corresponds to the second transverse connecting rod 9, and the plug-in sleeve 15 is provided with a plug interface matching the second transverse connecting rod 9. When the driving motor 11 drives the turntable 12 to rotate forward, the turntable 12 drives the slider 14 slidingly matched with the inside through the arc groove 13, so as to synchronously drive the four first transverse connecting rods 8 to move outward, and the first transverse connecting rod 8 drives the second transverse connecting rod 9 to move outward through the vertical connecting rod 7. When the driving motor 11 drives the turntable 12 to rotate reversely, the turntable 12 drives the slider 14 slidingly matched with the inside through the arc groove 13, so as to synchronously drive the four first transverse connecting rods 8 to move inward, and the first transverse connecting rod 8 drives the second transverse connecting rod 9 to move inward through the vertical connecting rod 7.

[0036] Through the setting of the connection mechanism, due to the different models of valves, the side lengths of the molds will also be different. When it is necessary to replace molds with different side lengths, the upper and lower molds 3 are separated, and then the drive motor 11 is turned on to drive the turntable 12 to rotate forward. The turntable 12 drives the slider 14 that slides in the interior through the arc groove 13, so that the four first transverse connecting rods 8 are synchronously driven to move outward. The first transverse connecting rod 8 drives the second transverse connecting rod 9 to move outward through the vertical connecting rod 7, so that the four second transverse connecting rods 9 are synchronously driven to withdraw from the plug-in sleeve 15, and then the lower mold 3 with different side lengths is replaced, and the drive motor 11 drives the turntable 12 to rotate in the opposite direction. The turntable 12 The arc groove 13 drives the slider 14 that slides inside to synchronously drive the four first transverse links 8 to move inward. The first transverse link 8 drives the second transverse link 9 to move inward through the vertical link 7 until the end of the second transverse link 9 is fully inserted into the plug sleeve 15 again, thereby completing the fixation of the lower mold 3. The split design of the upper and lower molds 3 can not only cooperate with the placement base 2, so that the entire mold does not need to be replaced together when replaced, thus reducing physical exertion, but also different lower molds 3 can be conveniently replaced on the placement base 2 according to the specifications of the product, and production needs can be quickly adjusted according to customer order requirements.

[0037] In some embodiments, Figure 6 As shown, guide plates 16 are symmetrically fixedly connected to both sides of the plug interface of the plug sleeve 15, and a smooth layer is fixedly connected to the guide plates 16.

[0038] An anti-skid layer is fixedly connected to the inner wall of the plug-in interface of the plug-in sleeve 15, and an anti-skid pattern is formed at the end of the second transverse connecting rod 9.

[0039] Through the setting of the guide plate 16, it can play a guiding role when replacing the lower mold 3. It only needs to be roughly positioned. Even if there is a slight deviation, under the action of the guide plate 16, the lower mold 3 will be displaced and automatically aligned until the second transverse connecting rod 9 is inserted into the plug-in sleeve 15, thereby preventing the second transverse connecting rod 9 from being misaligned with the plug-in interface of the plug-in sleeve 15.

[0040] The length of the second transverse connecting rod 9 is smaller than that of the first transverse connecting rod 8 , and the diameter of the rotating disk 12 is smaller than the side length of the placement base 2 .

[0041] Working principle: by setting up the placement base 2, the lower mold 3, the upper mold 4 and the positioning assembly mechanism 6, by installing the lower mold 3 on the placement base 2, and then injecting sand into the upper and lower casting molds to form a mold, the upper and lower casting molds are closed, and the upper and lower casting molds are quickly positioned, assembled and fixed by the positioning assembly mechanism 6, and then the metal liquid is injected through the casting port 5 to complete the valve casting, and by unscrewing the bolt 67, the upper mold 4 and the lower mold 3 can be separated and disassembled, so that the cast valve can be conveniently taken out. After assembly, under the action of the placement base 2 and the positioning assembly mechanism 6, the stability is good, and the workpiece is easy to take out, and the use effect is good.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sand casting mold for EGR valve production, comprising a placement base (2), a lower mold (3) arranged on the top of the placement base (2), and an upper mold (4) arranged above the lower mold (3), characterized in that: A positioning assembly mechanism (6) for quick matching is provided between the upper mold (4) and the lower mold (3).

2. The sand casting mold for EGR valve production according to claim 1, characterized in that: A casting port (5) is fixedly connected to the top center of the upper mold (4), and the casting port (5) is communicated with the interior of the upper mold (4).

3. The sand casting mold for EGR valve production according to claim 2, characterized in that: The positioning assembly mechanism (6) comprises an upper positioning block (62), a lower positioning block (61), a positioning ring (63), a positioning groove (64), a bolt (67), a through hole (65), and a screw hole (66); the upper positioning block (62) is welded to the upper mold (4); the lower positioning block (61) is welded to the lower mold (3); the lower positioning block (61) and the upper positioning block (62) correspond to each other; the top of the lower positioning block (61) is fixedly connected with the positioning ring (63); the upper positioning block (62) is provided with a positioning groove (64) matching the positioning ring (63); the upper positioning block (62) is provided with a through hole (65); the lower positioning block (61) is provided with a screw hole (66); the axes of the through hole (65), the screw hole (66) and the positioning ring (63) coincide with each other; the bolt (67) passes through the through hole (65) and then is threadedly engaged with the screw hole (66).

4. The sand casting mold for EGR valve production according to claim 3, characterized in that: The top of the positioning ring (63) is provided with a rounded corner, and the edge of the positioning groove (64) is provided with a rounded corner.

5. The sand casting mold for EGR valve production according to claim 4, characterized in that: The positioning assembly mechanisms (6) are arranged on four sides of the upper mold (4) and the lower mold (3), and two are arranged on each side.

6. The sand casting mold for EGR valve production according to claim 5, characterized in that: The placement base (2) is provided with a connection mechanism for adapting to various molds with different side lengths, the connection mechanism comprising a base plate (1), a turntable (12), a drive motor (11), an arc groove (13), a slider (14), a slide hole (10), a first transverse connecting rod (8), a second transverse connecting rod (9), a vertical connecting rod (7), and a plug sleeve (15); the base plate (1) is fixedly connected to the bottom of the placement base (2); the top of the base plate (1) is rotatably connected to the turntable (12), and the axis of the turntable (12) passes through the midpoint of the top surface of the placement base (2); the drive motor (11) The rotating disk (12) is fixedly connected to the placing base (2), and the output end of the driving motor (11) is connected to the center of the rotating disk (12); the four surfaces of the placing base (2) are provided with sliding holes (10) matching the first transverse connecting rod (8); one end of the first transverse connecting rod (8) inside the placing base (2) is fixedly connected to a sliding block (14); the rotating disk (12) is provided with an arc groove (13) corresponding to the sliding block (14); the sliding block (14) is slidably matched in the arc groove (13); one end of the first transverse connecting rod (8) extending to the outside of the placing base (2) is fixedly connected to the rotating disk (12); A vertical connecting rod (7) is connected, and the top of the vertical connecting rod (7) is fixedly connected to a second transverse connecting rod (9), the first transverse connecting rod (8) and the second transverse connecting rod (9) are parallel to each other, and the center line of the first transverse connecting rod (8) intersects with the axis of the turntable (12), and the four surfaces of the lower mold (3) are fixedly connected to a plug sleeve (15), the position of the plug sleeve (15) corresponds to the second transverse connecting rod (9), and the plug sleeve (15) is provided with a plug interface matching the second transverse connecting rod (9), and when the driving motor (11) drives the turntable (12) to rotate in the forward direction, the turntable ( 12) drives the slider (14) slidably matched inside through the arc groove (13) so as to synchronously drive the four first transverse connecting rods (8) to move outwards, and the first transverse connecting rod (8) drives the second transverse connecting rod (9) to move outwards through the vertical connecting rod (7). When the driving motor (11) drives the turntable (12) to rotate in the opposite direction, the turntable (12) drives the slider (14) slidably matched inside through the arc groove (13) so as to synchronously drive the four first transverse connecting rods (8) to move inwards, and the first transverse connecting rod (8) drives the second transverse connecting rod (9) to move inwards through the vertical connecting rod (7).

7. The sand casting mold for EGR valve production according to claim 6, characterized in that: Guide plates (16) are symmetrically fixedly connected to both sides of the plug interface of the plug sleeve (15), and a smooth layer is fixedly connected to the guide plates (16).

8. The sand casting mold for EGR valve production according to claim 7, characterized in that: An anti-skid layer is fixedly connected to the inner wall of the plug-in interface of the plug-in sleeve (15), and an anti-skid pattern is provided at the end of the second transverse connecting rod (9).

9. The sand casting mold for EGR valve production according to claim 8, characterized in that: The length of the second transverse connecting rod (9) is smaller than that of the first transverse connecting rod (8), and the diameter of the rotating disk (12) is smaller than the side length of the placement base (2).

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