A sand falling device

Abstract

The present invention belongs to the technical field of sand casting, and discloses a sand-falling device, which includes a workbench, a clamping mechanism and a vibrating hammer, wherein the workbench is used to hold the casting to be sand-falling, the clamping mechanism is used to fix the casting, the vibrating hammer can hammer the casting to apply vibration force to the casting, and the clamping mechanism includes: a pair of clamping parts arranged opposite to each other; a pair of airbag parts, which are arranged on the workbench and are used to fix the pair of clamping parts respectively, and the airbag parts can drive the pair of clamping parts to move toward or away from each other when filling or exhausting gas, so that the pair of clamping parts can clamp or release the casting together. The sand-falling device provided by the present invention has a clamping mechanism that fixes the clamping part through the airbag part, and specifically clamps the casting with soft support through the expansion of the airbag part, which can avoid crushing or scratching the casting, so that the casting after sand-falling can have a better appearance quality.

Description

Technical Field

[0001] The invention relates to the technical field of sand casting, in particular to a sand falling device. Background Art

[0002] After the sand casting is formed, a sand falling device is needed to separate the casting and the molding sand (external core) attached to the outer wall of the casting to obtain the casting.

[0003] The existing sand-falling operation generally adopts the rod-type sand-falling device, which operates by pressing and inserting multiple rods into the outer core of the casting to break up and peel off the molding sand. During the operation, the rods and the outer wall of the casting will form hard contact and hard friction, causing indentations, scratches and other damages on the surface of the casting, affecting the appearance quality of the casting.

[0004] Therefore, the above problems need to be solved urgently. Summary of the invention

[0005] The object of the present invention is to provide a sand-falling device, the sand-falling operation of which can avoid damaging castings.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A sand-falling device comprises a workbench, a clamping mechanism and a vibrating hammer, wherein the workbench is used to hold a casting to be sand-falling, the clamping mechanism is used to fix the casting, the vibrating hammer can hammer the casting to apply a vibration force to the casting, and the clamping mechanism comprises:

[0008] A pair of clamping parts arranged opposite to each other;

[0009] A pair of airbag parts are arranged on the workbench and used to fix the pair of clamping parts respectively. The airbag parts can drive the pair of clamping parts to move toward or away from each other when filling or exhausting gas, so that the pair of clamping parts can clamp or release the casting together.

[0010] Preferably, the airbag portion includes at least one airbag, and when the number of the airbags is two or more, the airbags are coaxially arranged in parallel.

[0011] Preferably, a plurality of sand-falling bars are arranged on the opposite clamping surfaces of a pair of the clamping parts, and the clamping parts are in contact with the casting through the sand-falling bars.

[0012] Preferably, the hardness of the shakeout bar is lower than the hardness of the casting.

[0013] Preferably, the clamping portion is used to clamp the side wall of the casting to match the outer shape of the casting.

[0014] Preferably, the clamping mechanism further comprises a pair of bases, the pair of bases are used to fix a pair of the airbag parts respectively, and the pair of bases can be detachably arranged on the workbench.

[0015] Preferably, the workbench is provided with a plurality of groups of mounting holes, and the mounting holes are used for mounting the base.

[0016] Preferably, the sand falling device further comprises a transfer mechanism, and the vibrating hammer is fixed to the movable end of the transfer mechanism so as to be able to adjust the spatial position of the vibrating hammer.

[0017] Preferably, the transfer mechanism comprises:

[0018] A bracket, fixed to the workbench and extending in a vertical direction;

[0019] A first cross arm, fixed to the bracket and extending along a first horizontal direction;

[0020] A second cross arm is slidably connected to the first cross arm so as to be able to slide along the first direction, and the second cross arm extends along a second direction that is horizontal and perpendicular to the first direction;

[0021] The mounting seat is slidably connected to the second cross arm so as to be able to slide along the second direction. The vibrating hammer is slidably connected to the mounting seat and can slide along the vertical direction.

[0022] Preferably, the second cross arms are arranged in pairs, each pair of the second cross arms is provided with a pair of the mounting seats, and each mounting seat is provided with the vibrating hammer.

[0023] Beneficial effects of the present invention:

[0024] The sand-falling device provided by the present invention has a clamping mechanism that fixes the clamping part through the airbag part, and specifically forms a soft-support clamp for the casting through the expansion of the airbag part. Due to the deformable and elastic properties of the airbag part, it can prevent excessive pressure from being applied to the casting through its own deformation, thereby preventing the clamping part from crushing the casting. At the same time, during the sand-falling operation, the vibrator hammers the casting, and the clamping part pressed against the casting by the airbag part can move synchronously with the casting to a certain extent, that is, the clamping part can always remain relatively fixed with the casting, avoiding scratches on the casting caused by relative displacement of the pressure plate and the casting due to the hammering of the vibrator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a front view of a sand falling device in an embodiment of the present invention;

[0026] Figure 2 2 is a side view of the sand falling device in the embodiment of the present invention.

[0027] In the figure:

[0028] 100. Castings;

[0029] 1. Workbench; 2. Clamping mechanism; 21. Clamping part; 211. Sand falling rod; 22. Airbag part; 221. Airbag; 23. Base; 3. Vibrating hammer; 4. Transfer mechanism; 41. Bracket; 42. First cross arm; 43. Second cross arm. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] The present embodiment provides a sand-falling device, which can be used for the sand-falling operation of a casting made by sand casting. It can avoid damaging the casting during the sand-falling operation, especially avoid the clamping mechanism from crushing or scratching the casting, so that the casting has better surface quality after sand-falling.

[0035] See also Figure 1 and Figure 2 The sand-falling device includes a workbench 1, a clamping mechanism 2 and a vibrating hammer 3. The workbench 1 is used to hold the casting 100 to be sand-falling, the clamping mechanism 2 is used to fix the casting 100, the vibrating hammer 3 can hammer the casting 100 to apply a vibration force to the casting 100, and the clamping mechanism 2 includes a pair of clamping parts 21 and a pair of airbag parts 22 arranged opposite to each other. The pair of airbag parts 22 are both arranged on the workbench 1 and are used to fix the pair of clamping parts 21 respectively. The airbag parts 22 can drive the pair of clamping parts 21 to move toward or away from each other when filling or exhausting gas, so that the pair of clamping parts 21 can clamp or release the casting 100 together.

[0036] By means of the above structure, when the airbag portion 22 is inflated, the pair of clamping portions 21 can gradually approach each other until they are pressed against two opposite side walls of the casting 100 located between the pair of clamping portions 21, thereby fixing the casting 100. Due to the deformable and elastic properties of the airbag portion 22, it can prevent excessive pressure from being applied to the casting 100 through its own deformation, thereby preventing the clamping portion 21 from crushing the casting 100. At the same time, during the sand dropping operation, the vibrator 3 hammers the casting 100, and the clamping portion 21 pressed against the casting 100 by the airbag portion 22 can move synchronously with the casting 100 to a certain extent, that is, the clamping portion 21 can always remain relatively still with the casting 100, thereby avoiding scratching the casting 100 due to the relative sliding of the clamping portion 21 and the casting 100 caused by the hammering of the vibrator 3.

[0037] In this embodiment, the airbag portion 22 includes an airbag 221. The airbag 22 can be a conventional industrial airbag, which generally includes an airbag body made of rubber and metal plates arranged in parallel on both sides of the airbag body. The two metal plates are installed vertically, one of the metal plates is fixed to the base 23, and the other metal plate is used to fix or directly serve as the clamping portion 21, so that when the airbag portion 22 is inflated, the clamping portion 21 can move toward the casting 100.

[0038] It should be noted that in other optional embodiments, the airbag portion 22 may also include two or more airbags 221, and when the number of airbags 221 is more than two, the airbags 221 are coaxially arranged in parallel so that the airbag portion can have a stable expansion and contraction direction.

[0039] like Figure 1As shown, in this embodiment, the outer wall of the casting 100 is generally planar, so the clamping portion 21 is a flat plate body to match the casting 100. As an alternative or as a structural form that can be matched with castings 100 of other shapes, the side wall of the clamping portion 21 used to clamp the casting 100 should be matched with the shape of the casting 100, such as a C-shaped, V-shaped structure.

[0040] In this embodiment, the clamping mechanism 2 further specifically includes a pair of bases 23, and the pair of bases 23 are used to respectively fix a pair of airbag parts 22. Specifically, the bases 23 are fixed to the workbench 1.

[0041] Optionally, a pair of bases 23 can be detachably disposed on the workbench 1 to facilitate replacement of the airbag portion 22 or adjustment of the position of the airbag portion 22. For example, the workbench 1 can be provided with a plurality of groups of mounting holes arranged in a linear or array manner, each group of mounting holes is used to mount the base 23, so that the position of the airbag portion 22 can be adjusted by mounting the base 23 at each group of mounting holes, so that the clamping mechanism 2 can be adapted to castings 100 of different sizes.

[0042] In order to improve the sand-falling effect, a plurality of sand-falling bars 211 are evenly arranged on the clamping surfaces facing each other of the pair of clamping parts 21, and the clamping parts 21 are in contact with the casting 100 through the sand-falling bars 211. In the process of the clamping parts 21 moving toward the casting 100 and clamping the casting 100, the sand-falling bars 211 distributed on the clamping parts 21 can press the molding sand attached to the outside of the casting 100, so that the molding sand is peeled off directly or under the vibration force of the vibrating hammer 3.

[0043] It is understandable that the sand-falling rod 211 can be regarded as a part of the clamping part 21, that is, the sand-falling rod 211 can be an integrated structure with the clamping part 21. Of course, the sand-falling rod 211 can also be a rod-shaped structure adapted to be installed with the clamping part 21, so that individual sand-falling rods 211 can be selectively replaced after being damaged.

[0044] In order to prevent the sand-falling rod 211 from damaging the casting 100 when pressing the casting 100, the material of the sand-falling rod 211 can be selected to be a material with a lower hardness than the casting 100. For example, the sand-falling rod 211 can be made of nylon, and the hardness of nylon is lower than that of common iron alloy or aluminum alloy castings 100. Of course, the sand-falling rod 211 made of nylon is only a feasible example, and the implementer can also select the sand-falling rod 211 made of other materials such as engineering plastics that can be processed into a rod shape.

[0045] The workbench 1 can be made of a rigid material such as metal, and can have a flat work surface to install the clamping mechanism 2 and stably place the casting 100. At the same time, optionally, the workbench 1 can also have a hollow work surface, and a sand storage hopper can be provided under the workbench 1 to collect the molding sand peeled off from the casting 100 during the sand falling operation.

[0046] The vibrating hammer 3 can be specifically a pneumatic vibrating hammer 3, which is equipped with an air source capable of providing compressed air and corresponding air supply pipelines, valves, etc. The specific air supply configuration structure is prior art and will not be described in detail here.

[0047] It should be particularly pointed out that, in order to avoid structural defects in the sand casting 100 after cooling and shrinkage, the casting mold is generally designed with a cavity for storing liquid metal that is in communication with the cavity of the casting 100, as a supplementary part attached to the top or side of the casting 100. After the casting 100 is cooled and formed, this part of the metal forms a riser, which needs to be removed in the subsequent processing steps. In this embodiment, in order to avoid the vibrator 3 from damaging the casting 100, during the sand dropping operation, the position of the vibrator 3 can be adjusted to correspond to the riser position of the casting 100. Since the riser needs to be removed in the subsequent process, whether the riser is damaged by the hammer does not affect the appearance quality of the casting 100.

[0048] In order to achieve the purpose of adjusting the spatial position of the vibrating hammer 3 , in this embodiment, the sand falling device may further include a transfer mechanism 4 , and the vibrating hammer 3 is fixed to the movable end of the transfer mechanism 4 .

[0049] Specifically, the transfer mechanism 4 includes a bracket 41, a first cross arm 42, a second cross arm 43 and a mounting seat. The bracket 41 is fixed to the workbench 1 and extends in the vertical direction. The first cross arm 42 is fixed to the bracket 41, such as being specifically fixed to the top of the bracket 41, and extends in a horizontal first direction. The second cross arm 43 is slidably connected to the first cross arm 42 so as to be able to slide in the first direction, and the second cross arm 43 extends in a second direction that is horizontal and perpendicular to the first direction. The mounting seat is slidably connected to the second cross arm 43 so as to be able to slide in the second direction, and the vibrator 3 is slidably connected to the mounting seat and can slide in the vertical direction. In the horizontal direction, the second cross arm 43 slides along the first cross arm 42, and combined with the mounting seat sliding along the second cross arm 43, the mounting seat can be moved in a two-dimensional plane on a horizontal plane. At the same time, the vibrator 3 can slide up and down along the mounting seat, thereby achieving the purpose of moving and adjusting the position of the vibrator 3 in three-dimensional space.

[0050] In particular, the second cross arms 43 can be arranged in pairs, and a pair of second cross arms 43 are each provided with a pair of mounting seats, and each mounting seat is provided with a vibrator 3, so that the casting 100 can be hammered simultaneously by four vibrators 3, thereby improving the efficiency of the sand-falling operation. Of course, in other optional embodiments, the number of second cross arms 43, the number of mounting seats provided on the second cross arms 43, and the number of vibrators 3 provided on the mounting seats can all be one, two, or other numbers, and the implementer can make specific settings according to parameters such as the volume and number of risers of the casting 100, the weight and hammering force of the vibrator 3, and the specific process and method of the setting do not require creative labor, so they will not be described in detail.

[0051] It should be pointed out that the mounting seat can be regarded as an independent structural member, which is slidably connected to the second cross arm 42, and the vibrator 3 is slidably connected to it; or, the mounting seat can also be regarded as a part of the vibrator 3, that is, the vibrator 3 itself has a telescopic structure that can be telescopic to move its hammer head in the vertical direction. In addition, the first cross arm 42, the second cross arm 43 and the mounting seat can be correspondingly installed with a screw nut sliding mechanism or a gear rack sliding mechanism, so as to respectively drive the second cross arm 43, the mounting seat and the vibrator 3 to slide.

[0052] Exemplarily, two screw rods are arranged on the first cross arm 42 at intervals along its length direction. Both ends of the two screw rods are connected to the first cross arm 42 through positioning parts such as bearings and bearing seats so that they can rotate along their own long axis directions. Nuts are screwed on the two screw rods, and the nuts bear weight and guide through slide rails arranged parallel to the screw rods. A second cross arm 43 is installed on the two nuts, so that the nuts can drive the second cross arm 43 to slide along the screw rod when the screw rod rotates.

[0053] In particular, the two screw rods can be driven by a power source such as a shaft-connected motor to adjust the position of the second cross arm 43. Alternatively, the opposite shaft ends of the two screw rods can be fixedly connected by a coupling, and threads with opposite directions are respectively provided to enable the two second cross arms 43 to move relative to or away from each other when the two screw rods rotate synchronously in the forward or reverse direction.

[0054] The structures of the second cross arm 43 and the mounting seat can refer to the structural setting of the first cross arm 42 mentioned above. The specific structure and mounting method of the gear rack sliding mechanism are also existing technologies and will not be described in detail here.

[0055] In summary, the sand falling operation process of the sand falling device provided in this embodiment is as follows:

[0056] First, the two vibrators 3 are lifted by the transfer mechanism 4, and the airbag part 22 is in an uninflated state, so that a clamping space capable of placing the casting 100 to be shaken out is formed between the vibrators 3 and the clamping mechanism on the workbench 1.

[0057] Then, the casting 100 to be shaken out is placed on the workbench 1 , and air is supplied to the airbag portion 22 through the air source. The airbag portion 22 gradually expands until the shakeout rods 211 of the two clamping portions 21 are both pressed against the casting 100 , thereby clamping the casting 100 .

[0058] Subsequently, the positions of the two vibrating hammers 3 are adjusted by the transfer mechanism 4 to respectively press against the risers of the casting 100 , and then the vibrating hammers 3 are started to perform the sand dropping operation.

[0059] Finally, after the molding sand on the casting 100 is completely removed, the casting 100 is removed, and the molding sand scattered on the workbench 1 is cleared to prepare for the next sand removal operation.

[0060] It is understandable that when processing a casting 100 with a relatively regular structure or a casting that is easier to shed sand, the casting 100 can be hammered only by the vibrating hammer 3 , that is, there is no need to clamp the casting 100 by the clamping mechanism 2 .

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A sand falling device, characterized in that: The invention comprises a workbench (1), a clamping mechanism (2) and a vibrating hammer (3), wherein the workbench (1) is used to hold a casting (100) to be sanded, the clamping mechanism (2) is used to fix the casting (100), the vibrating hammer (3) can hammer the casting (100) to apply a vibration force to the casting (100), and the clamping mechanism (2) comprises: a pair of clamping portions (21) arranged opposite to each other; and a pair of airbag parts (22) disposed on the workbench (1) and used to fix the pair of clamping parts (21) respectively; the airbag parts (22) can drive the pair of clamping parts (21) to move towards or away from each other when filling or exhausting gas, so that the pair of clamping parts (21) can clamp or release the casting (100) together; A plurality of sand-falling rods (211) are evenly arranged on the opposite clamping surfaces of a pair of the clamping parts (21), and the clamping parts (21) are in contact with the casting (100) via the sand-falling rods (211).

2. The sand falling device according to claim 1, characterized in that: The airbag portion (22) includes at least one airbag (221). When the number of the airbags (221) is two or more, the airbags (221) are coaxially arranged in parallel.

3. The sand falling device according to claim 1, characterized in that: The hardness of the shakeout rod (211) is lower than the hardness of the casting (100).

4. The sand falling device according to claim 1, characterized in that: The clamping portion (21) is used to clamp the side wall of the casting (100) and is adapted to the outer shape of the casting (100).

5. The falling sand device according to claim 1, characterized in that: The clamping mechanism (2) further comprises a pair of bases (23), the pair of bases (23) being used to fix a pair of airbag parts (22) respectively, and the pair of bases (23) are both detachably arranged on the workbench (1).

6. The falling sand device according to claim 5, characterized in that: The workbench (1) is provided with a plurality of groups of mounting holes, and the mounting holes are used to mount the base (23).

7. The sand falling device according to claim 1, characterized in that: The sand falling device further comprises a transfer mechanism (4), the movable end of which is fixed with the vibrating hammer (3) so as to be able to adjust the spatial position of the vibrating hammer (3).

8. The sand falling device according to claim 7, characterized in that: The transfer mechanism (4) comprises: A bracket (41) is fixed to the workbench (1) and extends in a vertical direction; A first cross arm (42) is fixed to the bracket (41) and extends along a first horizontal direction; A second cross arm (43) is slidably connected to the first cross arm (42) so as to be able to slide along the first direction, and the second cross arm (43) extends along a second direction that is horizontal and perpendicular to the first direction; The mounting seat is slidably connected to the second cross arm (43) so as to be able to slide along the second direction; the vibrating hammer (3) is slidably connected to the mounting seat and is able to slide along the vertical direction.

9. The sand falling device according to claim 8, characterized in that: The second cross arms (43) are arranged in pairs, and a pair of the second cross arms (43) are each provided with a pair of the mounting seats, and each mounting seat is provided with the vibrating hammer (3).

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