Core box opening and closing driving mechanism

Abstract

A core box opening and closing drive mechanism, the core box includes a core box body movably mounted on a frame, and the core box body includes a left mold and a right mold; the drive mechanism includes a drive motor mounted on the frame, the output end of the drive motor is connected to a lead screw, and two sections of reverse threads are provided on the outer side of the lead screw; nuts are installed on the outer sides of the moving direction of the left mold and the right mold, the lead screw passes through the nut, and is threadedly connected to the nuts on the left mold and the right mold respectively through two sections of reverse threads. Firstly, the drive mechanism is connected to the left mold and the right mold of the core box body, so that the two molds are driven to move synchronously toward or away from each other, so that the core shooting machine can complete normal core shooting and coring work; secondly, the existing hydraulic cylinder driving method is replaced by using a lead screw with positive and negative threads and a nut, so that the left mold or the right mold can always keep synchronous movement on both sides.

Description

Technical Field

[0001] The utility model relates to the technical field of a core box of a core shooting machine, in particular to an opening and closing driving mechanism of a core box. Background Art

[0002] Core shooting machines are widely used in the cast pipe casting industry for shooting resin sand cores. There are two types of resin sand cores: hot core box and cold core box. The core shooting machine mainly uses two guide pillars and installs two different molds at the same time. The mold opening and closing are vertically parted. The mold located at the bottom can be opened and closed left and right by the driving mechanism for coring and sealing. The core sand mixture with liquid or solid thermosetting resin as the binder is injected into the heated core box, and the mold is opened and taken out after hardening.

[0003] The existing core box opening and closing drive mechanism usually uses a hydraulic cylinder with a guide rod. For example, the patent number CN216938319U previously applied by the inventor discloses a sand shooting mechanism for a core shooting machine, which is used for making sand cores for the socket of a cast pipe. The left mold body 15 and the right mold body 16 are driven to move by two groups of hydraulic cylinders respectively, and the two mold bodies can move along the guide rod 20 to realize the opening and closing of the mold. However, the inventor found in actual use that after the hydraulic cylinders have been used for a long time, the two hydraulic cylinders driving the same mold body to move cannot ensure synchronous movement, and a time difference will be generated, making the two sides of the mold body unbalanced, and the overall force of the mold body is offset, which increases the friction with the guide rod, accelerates the damage of the output end of the hydraulic cylinder and the guide rod, and increases the maintenance cost. In addition, due to the unbalanced force, when the left and right mold bodies move to conflict with each other, there is a gap between the left and right mold bodies, which aggravates the degree of sand leakage during the sand shooting process. Utility Model Content

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a core box opening and closing driving mechanism.

[0005] The technical solution of this utility model is as follows:

[0006] A core box opening and closing driving mechanism, the core box comprising a core box body movably mounted on a frame, the core box body comprising a left mold and a right mold, and the driving mechanism can drive the left mold and the right mold to move in directions toward or away from each other;

[0007] The driving mechanism comprises a driving motor mounted on a frame, the output end of the driving motor is connected to a lead screw, and two sections of reverse threads are provided on the outer side of the lead screw;

[0008] Nuts are installed on the outer sides of the left mold and the right mold in the moving direction. The lead screw passes through the nut and is threadedly connected with the nuts on the left mold and the right mold respectively through two sections of reverse threads.

[0009] In order to improve the stability of the left mold and the right mold when moving, two groups of driving motors are provided, two corresponding lead screws are provided, and nuts are installed on both sides of the moving direction of the left mold and the right mold.

[0010] The specific design of the frame is that the frame includes two horizontally arranged base frames, and two movable frames are arranged on the base frames, the movable frames can move along the extension direction of the base frames, and the left mold and the right mold are slidably connected to the two movable frames.

[0011] The screw is fixed in such a way that a base plate is installed on the two moving frames, and two limit plates are installed on both sides of the base plate. One end of the screw is rotatably connected to one limit plate, and the other end passes through the other limit plate and is connected to the drive motor.

[0012] In order to protect the lead screw and the nut, an L-shaped protective cover is arranged on the bottom plate, and the upper end of the L-shaped protective cover is arranged in contact with the left mold and the right mold.

[0013] In order to make the left mold and the right mold more stable when moving, linear guide rails are installed on the two moving frames, and sliders slidably connected to the linear guide rails are installed at the bottom of the left mold and the right mold.

[0014] In order to further improve the stability of movement, the number of sliding blocks installed on one side of the left mold or the right mold is not less than two.

[0015] In order to ensure the balance of mold movement to the greatest extent when using molds of different heights, the straight-line distance from the screw axis to the moving frame is 35cm-50cm.

[0016] The moving frame moves in such a way that two connecting frames parallel to the base frame are arranged between the two moving frames, and telescopic cylinders are arranged on both sides of the base frame, and the output ends of the telescopic cylinders are connected to the connecting frames.

[0017] In order to improve the wear resistance and load resistance of the lead screw, the lead screw is a trapezoidal lead screw, and the nut is a trapezoidal nut matched therewith.

[0018] The beneficial effects of the utility model are as follows: the utility model is a core box opening and closing drive mechanism, which is first connected with the left mold and the right mold of the core box body through the drive mechanism, so as to realize the synchronous movement of the two molds toward or away from each other, so that the core shooting machine can complete normal core shooting and coring work; secondly, by using a lead screw with positive and negative threads and a nut to replace the existing hydraulic cylinder driving mode, the left mold or the right mold can always keep synchronous movement, and the use of the guide rod is abandoned, so as to avoid the phenomenon of mold deviation caused by wear or rust of the guide rod, so that the movement of the mold is more stable and balanced, and then the sealing of the core box after the mold is buckled is guaranteed, the sand leakage is reduced, and the lead screw nut is fully engaged, so that the buckling of the mold is more stable under vibration or impact conditions; finally, by using the lead screw and the nut, the driving mechanism as a whole is more concise and compact, without the need for a complex hydraulic system, so that the investment and maintenance costs of the driving mechanism are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] In the attached picture:

[0021] Figure 1 It is a schematic diagram of the overall structure of the core box;

[0022] Figure 2 This is a partial structural diagram without the L-shaped protective cover installed;

[0023] Figure 3 It is a partial front view of the core box;

[0024] The components represented by the reference numerals in the figure are:

[0025] 1. Frame; 101. Base frame; 102. Mobile frame; 103. Connecting frame; 2. Core box body; 201. Left mold; 202. Right mold; 3. Driving motor; 4. Lead screw; 5. Nut; 6. Bottom plate; 7. Limit plate; 8. L-shaped protective cover; 9. Linear guide rail; 10. Slider; 11. Telescopic cylinder. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0027] Example

[0028] As mentioned in the background technology, a core shooting machine is needed when preparing the socket sand core of the cast pipe. The core shooting machine is divided into two parts, the upper and lower parts. The core box located at the lower part is the main mold for forming the sand core, and in order to be able to seal and coring, the core box requires a driving mechanism to drive its opening and closing. The inventor used a hydraulic cylinder drive method in previous manufacturing to drive the two molds to realize the opening and closing action. However, after long-term use, the hydraulic cylinders on both sides of the mold have poor synchronization, and when the guide rods used for guiding are worn or rusted, it will also affect the linear motion of the mold, which will cause the mold to shift. On the one hand, it aggravates the imbalance of the hydraulic cylinder, and on the other hand, it reduces the sealing of the mold. Therefore, the inventor made improvements during the production process and designed a new driving mechanism, which is explained in detail below with reference to the drawings.

[0029] This embodiment provides a core box opening and closing drive mechanism, see Figure 1 The core box includes a core box body 2 movably mounted on a frame 1, and the core box body 2 includes a left mold 201 and a right mold 202. The left mold 201 and the right mold 202 have the same shape and are both arc-shaped. The left mold 201 and the right mold 202 are slidably mounted on the frame 1. Specifically, the frame 1 includes two horizontally arranged base frames 101, and two movable frames 102 are arranged on the base frames 101. The movable frames 102 are arranged perpendicular to the extension direction of the base frames 101. The left mold 201 and the right mold 202 are slidably connected to the two movable frames 102, that is, the left mold 201 and the right mold 202 can move in a direction perpendicular to the extension direction of the base frames 101 and toward or away from each other to realize the opening and closing action of the core box, and the movement of the left mold 201 and the right mold 202 is driven by a driving mechanism.

[0030] As one of the main design points of the scheme, Figure 2 The driving mechanism includes a driving motor 3 mounted on the frame 1, and the output end of the driving motor 3 is connected to a lead screw 4, which can drive the lead screw 4 to rotate, and two sections of reverse threads are provided on the outside of the lead screw 4, and the two sections of reverse threads are symmetrically provided on the outside of the lead screw 4. Nuts 5 are installed on the outside of the moving direction of the left mold 201 and the right mold 202, and the lead screw 4 and the nut 5 are both set in a trapezoidal form, which can improve the wear resistance and load resistance, and ensure the stability of the connection between the two, thereby ensuring the stability of the movement of the left mold 201 and the right mold 202 and the sealing when closed. The nut 5 is installed on the outside of the starting position of the arc mold, and the lead screw 4 passes through the nut 5, and is threadedly connected with the nuts 5 on the left mold 201 and the right mold 202 respectively through two sections of reverse threads. The lead screw 4 is driven to rotate by the driving motor 3, and then the two nuts 5 are driven to move in opposite directions or away from each other through the two sections of reverse threads, and the left mold 201 and the right mold 202 move on the upper end of the moving frame 102 with the nut 5.

[0031] On the basis of the above structure, the drive motor 3 is provided with two groups, and the lead screws 4 are correspondingly provided with two groups. The two groups of drive motors 3 and the two lead screws 4 are respectively located on both sides of the moving direction of the left mold 201 and the right mold 202, and nuts 5 are installed on both sides of the moving direction of the left mold 201 and the right mold 202, that is, two nuts 5 are installed on both sides of each mold, which are respectively threadedly connected with the lead screws 4 on both sides. When the left mold 201 and the right mold 202 need to move, it is ensured that the drive motors 3 on both sides are started at the same time to synchronously drive the two molds to move.

[0032] In this embodiment, the two moving frames 102 are both equipped with linear guide rails 9. Figure 3 The bottom of the left mold 201 and the right mold 202 are both installed with a slider 10 that is slidably connected to the linear guide rail 9. When the left mold 201 and the right mold 202 slide along the movable frame 102, the slider 10 slides along the guide rail, which can guide the left mold 201 and the right mold 202 to ensure the stability of the two when moving. In addition, the number of sliders 10 installed on one side of the left mold 201 or the right mold 202 is not less than two. In this embodiment, two sliders 10 are installed on one side, which can enhance the guiding effect of the left mold 201 and the right mold 202 when moving and avoid deviation.

[0033] In addition, base plates 6 are installed on the two moving frames 102, and two corresponding base plates 6 are arranged on both sides of the mold moving direction, respectively used to install corresponding driving motors 3 and other components on both sides, and two limit plates 7 are installed on both sides of the base plate 6, one end of the lead screw 4 is rotatably connected to a limit plate 7, and the other end passes through another limit plate 7 and is connected to the driving motor 3, and the driving motor 3 is installed on the outer side of the corresponding limit plate 7, and the height of the base plate 6 should be limited to a certain extent, so that the straight-line distance from the axis of the lead screw 4 to the moving frame 102 is 35cm-50cm, so that the lead screw 4 and the nut 5 can be ensured to be at a suitable height, so that when using molds of different heights, the mold can be driven to move in a relatively balanced and stable state.

[0034] On the basis of the above structure, an L-shaped protective cover 8 is arranged on the bottom plate 6, and its upper end is arranged in contact with the left mold 201 and the right mold 202. The opening of the L-shaped protective cover 8 faces the side of the lead screw 4, that is, the upper end is bent toward the wire side and is arranged in contact with the mold, ensuring that the lead screw 4 and the nut 5 can be shielded to provide protection for the two.

[0035] In this embodiment, in order to enable the movable frame 102 to drive the core box to move to the core making center and to move out to complete the coring action, the movable frame 102 can move along the extending direction of the base frame 101, and two connecting frames 103 parallel to the base frame 101 are arranged between the two movable frames 102, and telescopic cylinders 11 are arranged on both sides of the base frame 101, that is, two telescopic cylinders 11 are arranged, and the output end of the telescopic cylinder 11 is connected to the connecting frame 103, and the telescopic cylinder 11 can drive the connecting frame 103 to move, and then drive the movable frame 102 to slide along the base frame 101, and guide wheels are arranged on the inner sides of both ends of the connecting frame 103, and the guide wheels are rollingly connected to the inner side of the base frame 101. The guide wheels can not only play a guiding role, but also prevent the connecting frame 103 from being offset, and can also reduce the friction between the connecting frame 103 and the base frame 101.

Claims

1. A core box opening and closing drive mechanism, characterized in that: The core box comprises a core box body (2) movably mounted on a frame (1), and the core box body (2) comprises a left mold (201) and a right mold (202), and a driving mechanism is capable of driving the left mold (201) and the right mold (202) to move in directions toward or away from each other; The driving mechanism comprises a driving motor (3) mounted on a frame (1); an output end of the driving motor (3) is connected to a lead screw (4), and two sections of reverse threads are provided on the outer side of the lead screw (4); Nuts (5) are installed on the outer sides of the left mold (201) and the right mold (202) in the moving direction, and the lead screw (4) passes through the nut (5) and is threadedly connected to the nuts (5) on the left mold (201) and the right mold (202) through two sections of reverse threads.

2. The core box opening and closing drive mechanism according to claim 1, characterized in that: The driving motors (3) are provided in two groups, the lead screws (4) are provided in two groups correspondingly, and nuts (5) are installed on both sides of the moving direction of the left mold (201) and the right mold (202).

3. The core box opening and closing driving mechanism according to claim 1, characterized in that: The frame (1) comprises two horizontally arranged base frames (101), and two movable frames (102) are arranged on the base frames (101). The movable frames (102) can move along the extension direction of the base frames (101), and the left mold (201) and the right mold (202) are slidably connected to the two movable frames (102).

4. The core box opening and closing driving mechanism according to claim 3, characterized in that: A base plate (6) is installed on the two moving frames (102), and two limit plates (7) are installed on both sides of the base plate (6). One end of the lead screw (4) is rotatably connected to one limit plate (7), and the other end passes through the other limit plate (7) and is connected to the drive motor (3).

5. The core box opening and closing driving mechanism according to claim 4, characterized in that: An L-shaped protective cover (8) is arranged on the bottom plate (6), and the upper end of the L-shaped protective cover (8) is arranged in contact with the left mold (201) and the right mold (202).

6. The core box opening and closing driving mechanism according to claim 3, characterized in that: The two moving frames (102) are both equipped with linear guide rails (9), and the bottoms of the left mold (201) and the right mold (202) are both equipped with sliders (10) slidably connected to the linear guide rails (9).

7. The core box opening and closing driving mechanism according to claim 6, characterized in that: The number of sliding blocks (10) installed on one side of the left mold (201) or the right mold (202) is not less than two.

8. The core box opening and closing driving mechanism according to claim 1, characterized in that: The balance of the mold movement can be guaranteed to the greatest extent, and the straight-line distance from the axis of the lead screw (4) to the moving frame (102) is 35cm-50cm.

9. The core box opening and closing driving mechanism according to claim 3, characterized in that: Two connecting frames (103) parallel to the base frame (101) are arranged between the two moving frames (102), and telescopic cylinders (11) are arranged on both sides of the base frame (101), and the output ends of the telescopic cylinders (11) are connected to the connecting frames (103).

10. The core box opening and closing driving mechanism according to claim 1, characterized in that: The lead screw (4) is a trapezoidal lead screw, and the nut (5) is a trapezoidal nut matched therewith.

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