A sand core box
By designing a sand core box with a driving motor and a lead screw, the problem of sand core wear and hydraulic cylinder movement during the sand core on the roof of the traditional hydraulic cylinder is solved, and the uniform stress and stable molding of the sand core are achieved.
Patent Information
- Application Number
- CN202421440725.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-24
AI Technical Summary
The existing sand core core box can easily cause wear on the bottom of the sand core when lifting the sand core, and the lifting height may be out of synchronized after multiple hydraulic cylinders are used for a long time, resulting in an offset squeezing pressure between the inner ring of the sand core and the mandrel, which can easily damage the sand core structure.
A sand core core box is designed, using a driving motor to drive the lead screw and lift seat to move up and down, and drive the mandrel to move up and down, replacing the movement of the traditional hydraulic cylinder top sand core. The design includes a semicircular mold, mandrel, mounting plate, drive motor, lead screw, lift seat and lift guide rod, through which the lifting of the mandrel and the forming and core of the sand core are achieved.
This design avoids the direct effect of the hydraulic cylinder on the bottom surface of the sand core, protects the integrity of the sand core, and avoids damage to the sand core by the abnormal movement of the hydraulic cylinder. It has a simple structure and convenient operation, ensuring the uniform stress and stable molding of the sand core.
Smart Images
Figure CN222710751U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sand core boxes, in particular to a sand core box. Background Art
[0002] The socket sand core is a hollow sand block made by mixing sand and binder. It is a key material used in the casting process. It is mainly used to form a specific structure inside the casting. It is used to form complex shapes and spatial supports such as cavities, blind holes, through holes, etc. inside the casting during the casting process.
[0003] In the process of making the socket sand core, a core shooting machine is required. The core shooting machine includes a core box mold. Sand material and adhesive are shot into the core box mold of the core shooting machine. After the sand core hardens, the core box mold is opened to take out the finished sand core. However, after the sand core hardens, it is tightly squeezed with the core rod in the core box mold, and a core jacking operation is required to create a gap between the sand core and the core rod for convenient coring. In the prior art, multiple lifting cylinders are usually arranged at the bottom of the core box mold. After the core making is completed, the multiple lifting cylinders are contacted with the bottom of the sand core to lift it upward. However, on the one hand, the output end of the lifting cylinder will cause certain wear to the bottom of the sand core. On the other hand, after the multiple lifting cylinders are used for a long time, if the maintenance or inspection is not timely, the lifting height will be asynchronous, so that the sand core cannot be lifted at the corresponding position at the same time during lifting, so that the bottom of the sand core is unevenly stressed, resulting in an offset extrusion pressure between the inner ring of the sand core and the core rod, which is easy to damage the sand core structure. Utility Model Content
[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a sand core box.
[0005] The technical solution of this utility model is as follows:
[0006] A sand core box comprises a bottom frame with an opening in the middle, two semicircular moulds are movably connected to the upper end surface of the bottom frame, and a core rod is movably arranged between the two moulds;
[0007] The lower end surface of the bottom frame opening is provided with a mounting plate, a driving motor is installed below the middle position of the mounting plate, the output end of the driving motor is connected to a lead screw, and the lead screw passes through the mounting plate and is connected to a lifting seat through threads;
[0008] A lifting guide rod is provided at the bottom of the lifting seat, and the lifting guide rod passes through the mounting plate and is slidably connected thereto;
[0009] The bottom of the mandrel is fixed to the lifting seat through a locking piece and can move up and down along with the lifting seat.
[0010] In order to improve the stability of the lifting seat during lifting, a plurality of lifting guide rods are provided and arranged circumferentially relative to the lead screw.
[0011] Specifically, four lifting guide rods are provided, and the line connecting the centers of the four lifting guide rods forms a square.
[0012] In order to prevent the core rod from excessively moving when it is reset upward, limit blocks are arranged on both sides of the lifting seat, and a limit plate is arranged on the upper end surface of the bottom frame, and the limit blocks can move to conflict with the limit plate.
[0013] In order to limit the two sides of the lifting seat and further improve the stability during lifting, the outer side surface of the limit block contacts and is slidably connected to the adjacent side surface of the bottom frame.
[0014] In order to increase the friction between the limit block and the bottom frame and ensure the stability of the movement of the lifting seat, a first slide plate is installed on the outer side of the limit block, and a second slide plate is installed on the inner side of the bottom frame. The first slide plate is arranged in contact with the second slide plate, and anti-slip grooves are provided on the adjacent sides of the two slide plates.
[0015] The specific design of the locking piece is that a fixing plate is installed on the bottom surface of the core rod, and the locking piece includes a locking cylinder installed on the upper end of the lifting seat, the output end of the locking cylinder faces the fixing plate and is installed with a wedge block, and a locking groove cooperating with the wedge block is opened at the fixing plate.
[0016] In order to improve the locking strength of the core rod, at least two fixing plates are provided and arranged opposite to each other on the bottom surface of the core rod, and two groups of locking cylinders and wedge blocks are provided corresponding to the fixing plates.
[0017] In order to realize the opening and closing action of the core box, opening and closing mechanisms are arranged on both sides of the two semicircular molds, and the two semicircular molds can move in opposite directions or opposite directions through the opening and closing mechanisms.
[0018] In order to improve the stability of the installation of the driving motor, a motor frame is provided at the bottom of the mounting plate, and the driving motor is installed in the motor frame.
[0019] The beneficial effects of the utility model are as follows: the utility model is a sand core box, firstly, by providing two semicircular molds that can be opened and closed by an opening and closing mechanism, and providing a core rod that can be lifted and lowered between the semicircular molds, the required sand core can be formed between the core rod and the mold, and the core rod that can be opened and lifted is convenient for coring; secondly, the scheme drives the lead screw by a driving motor to drive the lifting seat up and down, and then drives the core rod up and down, replacing the traditional action of using a hydraulic cylinder to push the sand core. The scheme can drive the core rod downward to form a core pulling action. On the one hand, it does not act on the sand core, and can protect the bottom surface of the sand core to ensure the integrity of the sand core, avoiding damage to the sand core caused by asynchronous movement of multiple hydraulic cylinders; on the other hand, the lead screw drives the center of the core rod to move downward, and cooperates with the circumferentially arranged lifting guide rods, which will make the overall force on the core rod more uniform. Compared with hydraulic drive, the structure and system are simpler and the operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only used to illustrate the preferred embodiment and are not considered to be limiting of the present invention.
[0021] In the attached picture:
[0022] Figure 1 It is a schematic diagram of the overall structure of the sand core box;
[0023] Figure 2 It is a partial cross-sectional view of the core box side;
[0024] Figure 3 This is the enlarged view of point A;
[0025] Figure 4 It is a partial cross-sectional view of the core box front;
[0026] Figure 5 This is a partial view of the core box from above;
[0027] The components represented by the reference numerals in the figure are:
[0028] 1. Bottom frame; 2. Mold; 3. Mandrel; 4. Mounting plate; 5. Driving motor; 6. Lead screw; 7. Lifting seat; 8. Lifting guide rod; 9. Locking piece; 91. Locking cylinder; 92. Wedge block; 10. Limit block; 11. Limit plate; 12. First slide plate; 13. Second slide plate; 14. Anti-skid groove; 15. Fixed plate; 16. Locking groove; 17. Opening and closing mechanism; 18. Motor frame. DETAILED DESCRIPTION
[0029] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.
[0030] Example
[0031] As mentioned in the background technology, the preparation of the socket sand core requires a core shooting machine, which includes a core box mold 2, which is mainly used for molding the sand core. After molding, coring is required, and since the mold 2 has a core rod 3, it is convenient for the sand core to form a hollow structure, and the molded sand core is easy to fit with the core rod 3. A movable core rod 3 or sand core is required for coring. In the prior art, multiple hydraulic cylinders are usually used to push the sand core upward at the same time. However, the inventor has found many defects during use. Multiple hydraulic cylinders will produce asynchronism, which increases the number of defective sand cores. Therefore, the inventor has made improvements on the basis of the existing core box and designed a new core box, which will be explained in detail below with reference to the drawings.
[0032] This embodiment provides a sand core box, see Figure 1 , including a bottom frame 1 with an opening in the middle, that is, the bottom frame 1 is set in a tic-tac-toe structure, and the upper end surface of the bottom frame 1 is movably connected to two semicircular molds 2, and a core rod 3 is movably set between the two molds 2, and the two molds 2 can move towards or away from the core rod 3 at the same time. When the two molds 2 move to abut each other, a sand core is formed in the gap between the core rod 3 and the mold 2, and the setting of the core rod 3 can make the sand core form a hollow structure. The core rod 3 is a prior art, and the core rods 3 of different sizes are selected according to the size of the sand core caliber and installed between the two molds 2.
[0033] Among them, combined Figure 2 , the core rod 3 can move in the vertical direction. When preparing the sand core, the core rod 3 is in the highest position. When coring is required, the core rod 3 is driven downward by other components to perform the core pulling action, which replaces the action of the hydraulic cylinder lifting the sand core in the prior art. This is also the main design point different from the prior art. Among them, the lower end surface of the opening of the bottom frame 1 is provided with a mounting plate 4, and the mounting plate 4 is fixedly connected to the bottom frame 1. A drive motor 5 is installed below the middle position of the mounting plate 4, and the drive motor 5 is connected to a reducer. The motor frame 18 at the bottom of the mounting plate 4, and the drive motor 5 and the reducer are installed on the motor frame 18 at the bottom of the mounting plate 4. In the frame 18, the stability of the driving motor 5 and the reducer can be ensured. The output end of the driving motor 5 is connected to a lead screw 6, which is located at the center of the mounting plate 4, and the lead screw 6 penetrates the mounting plate 4 and is connected to a lifting seat 7 by threads, and a mounting nut is fixed at the center of the lifting seat 7 so that the lead screw 6 is engaged with the nut, and a lifting guide rod 8 is arranged at the bottom of the lifting seat 7, and the lifting guide rod 8 penetrates the mounting plate 4 and is slidably connected thereto, and the lifting guide rod 8 can limit the rotation of the lifting seat 7, and when the driving motor 5 drives the lead screw 6 to rotate, the lifting seat 7 is driven to move up and down by the engagement of the threads.
[0034] And, combined with Figure 5, there are multiple lifting guide rods 8, and they are arranged circumferentially relative to the lead screw 6. In this embodiment, there are four lifting guide rods 8, and the line connecting the centers of the four lifting guide rods 8 is a square, that is, the four lifting guide rods 8 are circumferentially arranged on the outside of the lead screw 6. Although at least one lifting guide rod can ensure that the lifting seat 7 can move in the vertical direction, setting four lifting guide rods 8 can not only ensure the balance of the lifting seat 7, but also save the number of lifting guide rods 8 used.
[0035] In order to be able to drive the mandrel 3 to move up and down, Figure 4 , to realize the core pulling action, the bottom of the mandrel 3 is fixed to the lifting seat 7 by a locking piece 9, and can move up and down with the lifting seat 7, wherein the fixing method of the mandrel 3 is that a fixing plate 15 is installed on the bottom surface of the mandrel 3, and the fixing plate 15 is supported on the mounting plate 4, the locking piece 9 includes a locking cylinder 91 installed on the upper end of the lifting seat 7, the locking cylinder 91 is fixed by bolts or the like, the output end of the locking cylinder 91 faces the fixing plate 15 and is installed with a wedge block 92, the fixing plate 15 is provided with a locking groove 16 that cooperates with the wedge block 92, and the wedge block 92 is driven by the output end of the locking cylinder 91 to enter the locking groove 16 to fix the mandrel 3 along with the fixing plate 15.
[0036] It should be noted that at least two fixing plates 15 are provided and are arranged opposite to each other on the bottom surface of the core rod 3. Two groups of locking cylinders 91 and wedge blocks 92 are provided corresponding to the fixing plates 15. At least two fixing plates 15 are provided to fix the core rod 3, which can improve the fixing strength of the core rod 3. The two wedge blocks 92 are driven to move in opposite directions by at least two groups of locking cylinders 91 until they are clamped against the corresponding locking grooves 16.
[0037] In this embodiment, the lifting seat 7 is located as a whole in the opening of the bottom frame 1. In order to achieve lifting, the width and length should not be greater than the width and length of the opening. Therefore, limit blocks 10 are arranged on both sides of the lifting seat 7, and the outer side surface of the limit block 10 is slidably connected to the adjacent side surface of the bottom frame 1, which can play a role of limiting and guiding the lifting seat 7, and a limit plate 11 is arranged on the upper end surface of the bottom frame 1, and the limit plate 11 extends into the opening. The limit block 10 can move to abut against the limit plate 11 when the lifting seat 7 moves upward, which plays a role of limiting the limit block 10, so that the lifting seat 7 can drive the core rod 3 to move to a preset position to avoid excessive movement and affect the molding of the sand core.
[0038] Based on the above structure, combined with Figure 3A first slide plate 12 is installed on the outer side of the limit block 10, and the first slide plate 12 is fixed to the limit block 10, and a second slide plate 13 is installed on the inner side of the bottom frame 1, and the second slide plate 13 is fixed to the inner side of the bottom frame 1. The limit block 10 is slidably arranged with the bottom frame 1 through the arrangement of the first slide plate 12 and the second slide plate 13. The first slide plate 12 and the second slide plate 13 are contacted with each other, and an anti-skid groove 14 is provided on the adjacent sides of the two. By arranging the anti-skid groove 14, the friction between the two can be increased, and slipping can be avoided.
[0039] In this embodiment, an opening and closing mechanism 17 is provided on both sides of the two semicircular molds 2, and the opening and closing mechanism 17 can move in opposite directions. The opening and closing mechanism 17 adopts an opening and closing motor to drive the lead screw 6 with positive and negative threads to rotate, and then the two nuts connected to the two molds 2 are rotated along the lead screw 6, so that the mold 2 is finally moved along the upper end surface of the bottom frame 1, and the opening and closing action of the core box is realized.
Claims
1. A sand core box, comprising a bottom frame (1) with an opening in the middle, characterized in that: The upper end surface of the bottom frame (1) is movably connected to two semicircular molds (2), and a core rod (3) is movably arranged between the two molds (2); The lower end surface of the opening of the bottom frame (1) is provided with a mounting plate (4), a driving motor (5) is installed below the middle position of the mounting plate (4), the output end of the driving motor (5) is connected to a lead screw (6), and the lead screw (6) passes through the mounting plate (4) and is connected to a lifting seat (7) via threads; A lifting guide rod (8) is provided at the bottom of the lifting seat (7), and the lifting guide rod (8) passes through the mounting plate (4) and is slidably connected thereto; The bottom of the core rod (3) is fixed to the lifting seat (7) via a locking piece (9) and can move up and down along with the lifting seat (7).
2. The sand core box according to claim 1, characterized in that: The lifting guide rods (8) are provided in plurality and are arranged circumferentially relative to the lead screw (6).
3. The sand core box according to claim 2, characterized in that: Four lifting guide rods (8) are provided, and the line connecting the centers of the four lifting guide rods (8) forms a square.
4. The sand core box according to claim 1, characterized in that: Limiting blocks (10) are arranged on both sides of the lifting seat (7), and a limiting plate (11) is arranged on the upper end surface of the bottom frame (1), and the limiting blocks (10) can move to contact with the limiting plate (11).
5. The sand core box according to claim 4, characterized in that: The outer side surface of the limiting block (10) is in contact with the side surface of the adjacent bottom frame (1) and is slidably connected thereto.
6. The sand core box according to claim 5, characterized in that: A first slide plate (12) is installed on the outer side of the limit block (10), and a second slide plate (13) is installed on the inner side of the bottom frame (1); the first slide plate (12) and the second slide plate (13) are arranged in contact with each other, and anti-slip grooves (14) are provided on the adjacent sides of the first slide plate (12) and the second slide plate (13).
7. The sand core box according to claim 1, characterized in that: A fixing plate (15) is installed on the bottom surface of the mandrel (3), and the locking member (9) includes a locking cylinder (91) installed on the upper end of the lifting seat (7). The output end of the locking cylinder (91) faces the fixing plate (15) and is installed with a wedge block (92). The fixing plate (15) is provided with a locking groove (16) that cooperates with the wedge block (92).
8. The sand core box according to claim 7, characterized in that: At least two fixing plates (15) are provided and are arranged opposite to each other on the bottom surface of the core rod (3); and two groups of locking cylinders (91) and wedge blocks (92) are provided corresponding to the fixing plates (15).
9. The sand core box according to claim 1, characterized in that: The two semicircular molds (2) are provided with opening and closing mechanisms (17) on both sides, and can move in opposite directions through the opening and closing mechanisms (17).
10. The sand core box according to claim 1, characterized in that: The bottom of the mounting plate (4) is provided with a motor frame (18), and the driving motor (5) is installed in the motor frame (18).