Lengthened rod type high-temperature-resistant mold shell clamp

Abstract

The invention provides an extension bar type high-temperature-resistant mold shell clamp, relates to the technical field of casting, and aims to solve the technical problem that in the investment casting process, a hot mold shell is prone to being broken or falling off when clamped. The lengthened rod type high-temperature-resistant mold shell clamp comprises a sleeve, a transmission rod, a clamping piece and a driving device, the clamping piece comprises a base and two clamping jaws movably arranged on the base, and the sleeve is arranged on the base; the transmission rod is movably arranged on the sleeve, one end of the transmission rod is connected with the two clamping jaws, the other end of the transmission rod penetrates through the base and the sleeve to be connected with the driving device, the transmission rod moves in the direction away from or close to the base so that the two clamping jaws can be closed or opened, each clamping jaw is sequentially provided with a connecting part, a hinging part and a clamping part, and the hinging parts of the clamping jaws are hinged to the base; the clamping piece further comprises a plurality of connecting plates, one ends of the connecting plates are hinged to the transmission rod, and the other ends of the connecting plates are hinged to the corresponding connecting parts. The number of the connecting plates is two. The fixture can effectively prevent the mold shell from being damaged by sudden change of clamping force rigidity due to contraction length error of the driving device.

Description

Technical Field

[0001] The invention relates to the technical field of casting, and in particular to an extended rod type high temperature resistant mold shell clamp. Background Art

[0002] Near-net material refers to a material that, during the manufacturing process, uses specific forming technology to make the part close to its final shape and size after forming, thereby reducing subsequent processing steps and material waste.

[0003] Investment casting is a precision casting method that uses fusible materials to make a model, which is coated with several layers of refractory coating. After drying and hardening, it becomes an integral shell. The shell is then heated to melt the model, and then baked at high temperature to become a refractory shell. Liquid metal is poured into the shell, and it becomes a casting after cooling.

[0004] As a near-net material molding method, investment casting has become the preferred method for castings in aerospace, weapons, nuclear power, medical, etc. However, in the fast-melting casting process, the hot mold shell needs to be taken out of the roasting furnace and combined with the molten casting bar before being put into the fast-melting furnace for rapid melting casting. At this time, the roasting furnace and the hot mold shell itself are at a high temperature of about 1200℃.

[0005] In the related art, when clamping the hot mold shell, the mold shell is often crushed or falls off. Summary of the invention

[0006] The object of the present invention is to provide an extended rod type high temperature resistant mold shell clamp to solve the technical problem that the hot mold shell is easily crushed or falls off during the investment casting process.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides an extended rod type high temperature resistant mold shell clamp, comprising a sleeve, a transmission rod, a clamping member and a driving device, wherein the clamping member comprises a base and two clamping claws movably arranged on the base, and the sleeve is arranged on the base;

[0009] The transmission rod is movably arranged on the sleeve, one end of the transmission rod is connected to the two clamping claws, and the other end passes through the base and the sleeve and is connected to the driving device.

[0010] According to at least one embodiment of the present invention, the transmission rod moves in a direction away from or close to the base to close or open the two clamping jaws.

[0011] According to at least one embodiment of the present invention, the clamping jaw has a connecting portion, a hinged portion and a clamping portion in sequence, and the hinged portion of the clamping jaw is hinged on the base;

[0012] The clamping member further comprises a plurality of connecting plates, one end of each connecting plate is hinged to the transmission rod, and the other end of each connecting plate is hinged to the corresponding connecting portion.

[0013] According to at least one embodiment of the present invention, the number of the connecting plates is two groups, each group of the connecting plates includes two connecting plates, and the two connecting plates in the same group are respectively arranged on two surfaces of the clamping jaw;

[0014] The clamping member further comprises two groups of ear plates arranged on the base, each group of the ear plates comprises two ear plates, and each of the hinged parts is hinged between the two ear plates of the same group.

[0015] According to at least one embodiment of the present invention, the clamping surface of the clamping portion is in the shape of a concave triangle.

[0016] According to at least one embodiment of the present invention, each pin shaft of the clamping member is sleeved with a rotating sleeve, and the rotating sleeve is made of high-temperature graphite.

[0017] According to at least one embodiment of the present invention, the clamp further comprises a sliding sleeve, the sliding sleeve is arranged in the first through hole of the base, and the transmission rod is slidably arranged in the sliding sleeve.

[0018] According to at least one embodiment of the present invention, the sliding sleeve is made of high-temperature graphite.

[0019] According to at least one embodiment of the present invention, the length of the sleeve ranges from 800 mm to 1500 mm.

[0020] According to at least one embodiment of the present invention, the sleeve, the transmission rod, the base and the clamping jaw are all made of 0Cr25Ni20 stainless steel.

[0021] According to at least one embodiment of the present invention, the driving device is a servo electric cylinder, and the end of the transmission rod facing away from the clamping jaw is connected to the telescopic end of the servo electric cylinder.

[0022] According to at least one embodiment of the present invention, the clamp further comprises an adjusting device, through which the transmission rod is transmission-connected to the driving device, the adjusting device comprises a connecting head, a sleeve, a butterfly spring, a bolt and a locking nut, and the sleeve is slidably disposed in the sleeve.

[0023] According to at least one embodiment of the present invention, a second through hole for the transmission rod to pass through is provided on the end plate of the sleeve away from the connector, the end of the transmission rod located in the sleeve has a sliding plate that cooperates with the sleeve, and the butterfly spring is sleeved on the transmission rod and located between the sliding plate and the end plate;

[0024] One end of the connector is connected to the driving device, and the other end is connected to the sleeve. The bolt is arranged at the end of the connector away from the driving device, and the nut of the bolt abuts against the sliding plate.

[0025] According to at least one embodiment of the present invention, the locking nut is sleeved on the bolt and fits on the end surface of the connecting head.

[0026] Among the one or more technical solutions provided in the exemplary embodiments of the present invention, at least one of the following beneficial effects can be achieved.

[0027] The extended rod type high temperature resistant formwork clamp of the exemplary embodiment of the present invention has a length of 800mm to 1500mm, so that the formwork can be grasped deep inside the roasting furnace. Specifically, the clamp is composed of a sleeve, a transmission rod, a clamping member and a driving device, wherein the driving device is close to one end of the sleeve, the clamping member is arranged at the other end of the sleeve, the driving device and the clamping member are connected by a transmission rod, and the transmission rod can move in the sleeve under the drive of the driving device. When the transmission rod moves toward the base, the transmission rod can drive the two jaws to open; when the transmission rod moves away from the base, the transmission rod can drive the two jaws to close so as to clamp the formwork.

[0028] Furthermore, an adjustment device is provided between the driving device and the transmission rod to buffer the sudden change in rigidity of the clamping force of the clamping jaws on the mold shell, thereby reducing the probability of damaging the mold shell. Specifically, the adjustment device includes a connector, a sleeve, a butterfly spring, a bolt and a locking nut, and the sleeve is slidably arranged in the sleeve; a second through hole for the transmission rod to pass through is provided on the end plate of the sleeve away from the connector, and the end of the transmission rod located in the sleeve has a sliding plate that cooperates with the sleeve, and the butterfly spring is sleeved on the transmission rod and is located between the sliding plate and the end plate, connected to the driving device through one end of the connector and connected to the sleeve at the other end, and the bolt is provided at the end of the connector away from the driving device, and the nut of the bolt abuts against the sliding plate. When the two clamping jaws are clamped, due to the compression and buffering effect of the butterfly spring, the rigid sudden change in the clamping force of the mold shell caused by the contraction length error of the driving device can be effectively protected from damaging the mold shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings illustrate exemplary embodiments of the present invention and together with the description serve to explain the principles of the present invention, and these drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification;

[0030] Figure 1 is a schematic diagram of the main structure of a clamp and a robot arm according to an embodiment of the present invention;

[0031] Figure 2 is a schematic diagram of a top view of a clamp according to an embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of the main structure of a clamp according to an embodiment of the present invention;

[0033] Figure 4 yes Figure 2 A partial enlarged view of part A;

[0034] Figure 5 yes Figure 3 A partial enlarged view of part B;

[0035] Figure 6 yes Figure 3 A partial enlarged view of part C.

[0036] Reference numerals:

[0037] 10. Clamping member; 11. Clamping claw; 111. Connecting portion; 112. Articulated portion; 113. Clamping portion; 12. Base; 121. Ear plate; 122. Sliding sleeve; 13. Connecting plate; 131. Pin shaft; 132. Rotating sleeve;

[0038] 21. Transmission rod; 211. Sliding plate; 22. Bushing; 23. Butterfly spring; 24. Sleeve; 241. End plate; 25. Connector; 251. Bolt; 252. Lock nut;

[0039] 30. Robotic arm;

[0040] 40. Mould shell. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] At present, there are two methods for clamping hot molds: manual clamping and robot grabbing. In the manual clamping method, workers wear protective clothing and hold several meters long fork-shaped clamps to clamp the molds. This method is labor-intensive and has a bad working environment. The hot molds are often knocked over. The robot grabbing method uses pneumatic clamps or servo motor driven clamps, but pneumatic clamps cannot change the stroke and the opening size is fixed. They cannot dynamically adapt to molds of different specifications, which limits the spacing of molds of various specifications when placed in the roasting furnace. At the same time, the robot grabbing method often crushes or falls off the molds when clamping the hot molds.

[0043] In response to the above problems, the extended rod type high temperature resistant mold shell clamp of the exemplary embodiment of the present invention has a buffer structure between the driving device and the transmission rod that controls the opening and closing of the two clamping jaws to effectively prevent the problem of damage to the mold shell caused by sudden changes in the clamping force.

[0044] Figure 1 2 is a schematic diagram of the front view of the clamp and the robot arm according to an embodiment of the present invention. Figure 1 As shown, the clamp of the exemplary embodiment of the present invention can be set at the end of the robot arm 30 through a flange, and the clamp is provided with a clamping member 10 at the end of the clamp in the form of a long rod. The clamping member 10 can be deeply inserted into the roasting furnace to take out the hot mold shell 40, thereby reducing the labor intensity of the personnel in the manual clamping method and avoiding the situation where the personnel frequently knock over the hot mold shell 40.

[0045] Figure 2 is a schematic diagram of a top view of a clamp according to an embodiment of the present invention; Figure 4 yes Figure 2 A partial enlarged view of part A; Figure 3 is a schematic diagram of the main structure of a clamp according to an embodiment of the present invention; Figure 5 yes Figure 3 A partial enlarged view of part B. Figure 2-Figure 5 As shown, an extended rod type high temperature resistant mold shell clamp of an exemplary embodiment of the present invention includes a sleeve 22, a transmission rod 21, a clamping member 10 and a driving device, the clamping member 10 includes a base 12 and two clamping jaws 11 movably arranged on the base 12, and the sleeve 22 is arranged on the base 12; the transmission rod 21 is movably arranged on the sleeve 22, one end of the transmission rod 21 is connected to the two clamping jaws 11, and the other end passes through the base 12 and the sleeve 22 and is connected to the driving device.

[0046] In practical applications, the driving device is a servo electric cylinder, and the end of the transmission rod 21 away from the clamping claw 11 is connected to the telescopic end of the servo electric cylinder. Compared with the pneumatic clamp used in the prior art, the servo electric cylinder can adjust the stroke of the telescopic end according to actual needs, and the opening size of the clamping member 10 can be adjusted by changing the stroke of the telescopic end, so that it can dynamically adapt to mold shells 40 of different specifications, so that the position spacing of mold shells 40 of various specifications is not restricted when they are placed in the roasting furnace.

[0047] The servo electric cylinder can be arranged in a box, and the box can be arranged at the end of the robot arm 30. The box and the base 12 are respectively arranged at the two ends of the sleeve 22. Specifically, one end of the transmission rod 21 is directly or indirectly connected to the telescopic end of the servo electric cylinder, and the other end passes through the sleeve 22 and the base 12 and is connected to the two clamping claws 11. When the telescopic end is extended, the transmission rod 21 pushes the two clamping claws 11 hinged on the base 12 to open them, and vice versa, the two clamping claws 11 are closed, thereby clamping the hot mold shell 40.

[0048] like Figure 4 and Figure 5As shown, the clamping jaw 11 has a connecting portion 111, a hinged portion 112 and a clamping portion 113 in sequence, and the hinged portion 112 of the clamping jaw 11 is hinged on the base 12; the clamping member 10 also includes a plurality of connecting plates 13, one end of the connecting plate 13 is hinged to the transmission rod 21, and the other end is hinged to the corresponding connecting portion 111.

[0049] Specifically, there are two groups of connecting plates 13, each group of connecting plates 13 includes two connecting plates 13, and the two connecting plates 13 in the same group are respectively arranged on the two surfaces of the clamping jaw 11; the clamping member 10 also includes two groups of ear plates 121 arranged on the base 12, each group of ear plates 121 includes two ear plates 121, and each hinged portion 112 is hinged between the two ear plates 121 in the same group.

[0050] Each clamping jaw 11 corresponds to a group of ear plates 121, and the hinged portion 112 of the clamping jaw 11 is rotatably arranged between the corresponding ear plates 121 of the same group through the pin 131. The hinged portion 112 is located at the outer side of the connecting portion 111, and the transmission rod 21 is located in the middle between the two groups of ear plates 121. The connecting portion 111 of each clamping jaw 11 is hinged to one end of the connecting plate 13 through the pin 131, and the other end of the connecting plate 13 is hinged to the transmission rod 21. The two connecting plates 13 of the same group are respectively located on two opposite surfaces of the clamping jaw 11, that is, two opposite surfaces of the transmission rod 21.

[0051] The clamping surface of the clamping portion 113 of the clamping jaw 11 is in the shape of a concave triangle, that is, the surfaces facing each other of the two clamping portions 113 are both in the shape of a concave triangle, which can automatically adapt to mold shells 40 of different specifications and diameters.

[0052] In some embodiments, each pin shaft 131 of the clamping member 10 is sleeved with a rotating sleeve 132 , and the rotating sleeve 132 is made of high-temperature graphite, so that the pin shaft 131 of the clamping member 10 can still rotate flexibly at a high temperature of about 1200° C.

[0053] In some embodiments, the clamp also includes a sleeve 122, which is disposed in the first through hole of the base 12, and the transmission rod 21 is slidably disposed in the sleeve 122. The portion of the transmission rod 21 that passes through the sleeve 122 may also be provided with a transmission connecting piece, and the transmission rod 21 is indirectly hinged to the two clamping jaws 11 through the transmission connecting piece, and the transmission connecting piece can still slide freely in the sleeve 122 at a high temperature of about 1200°C to maintain flexibility.

[0054] Exemplarily, in order to ensure normal operation under high temperature, the sleeve 22, the transmission rod 21, the transmission connector, the base 12, the pin 131 and the clamping jaw 11 are all made of 0Cr25Ni20 heat-resistant stainless steel.

[0055] For example, the servo motor in the servo electric cylinder is Delta SD-B3A-0221-P with a power of 200W; the push-pull force of the servo electric cylinder is 300kg, and the maximum movement stroke is 50mm.

[0056] In some embodiments, the telescopic end of the servo electric cylinder is connected to the transmission rod 21 via a T-shaped connector 25 , and the housing where the servo electric cylinder is located and the connector 25 are made of Q235B steel.

[0057] Figure 6 yes Figure 3 A partial enlarged view of part C. Figure 6 As shown, the clamp also includes an adjusting device, through which the transmission rod 21 is transmission-connected to the driving device. The adjusting device includes a connecting head 25, a sleeve 24, a butterfly spring 23, a bolt 251 and a locking nut 252, and the sleeve 24 is slidably disposed in the sleeve 22.

[0058] Exemplarily, a second through hole for the transmission rod 21 to pass through is provided on the end plate 241 of the sleeve 24 facing away from the connecting head 25, and the end of the transmission rod 21 located in the sleeve 24 has a sliding plate 211 that cooperates with the sleeve 24. The butterfly spring 23 is sleeved on the transmission rod 21 and is located between the sliding plate 211 and the end plate 241; one end of the connecting head 25 is connected to the driving device, and the other end is connected to the sleeve 24. The bolt 251 is provided at the end of the connecting head 25 facing away from the driving device, and the nut of the bolt 251 abuts against the sliding plate 211; the locking nut 252 is sleeved on the bolt 251 and fits on the end face of the connecting head 25.

[0059] In actual applications, one end of the T-type connector 25 is connected to the U-shaped head of the push rod of the servo electric cylinder, and the other end is threaded with the inner wall of the sleeve 24 near the end for easy disassembly and assembly. A threaded hole is provided on the end face of the T-type connector 25. The threaded hole is M8 and 26mm deep. A bolt 251 with adjustable threading depth is provided in the threaded hole, that is, the distance between the nut of the bolt 251 and the connector 25 is adjustable, and a locking nut 252 is provided on the bolt 251 for locking and limiting the bolt 251 so that its nut maintains a set distance from the connector 25.

[0060] Exemplarily, the specification of the bolt 251 is GBT70 M8x30, and the specification of the locking nut 252 is GBT6170M8.

[0061] The disc spring 23 is located in the sleeve 24 and is confined between the end plate 241 of the sleeve 24 and the sliding plate 211 of the transmission rod 21. The number of disc springs is adjusted according to actual needs, for example, 4, 6, 8, 12 pieces, etc., with a specification of 56x28.5x2x4.1 and a material of 60Si2MnA.

[0062] For example, the sleeve 24 is made of Q235B steel, has an inner diameter of φ58 mm and an outer diameter of φ65.8 mm, and is slidably disposed in the sleeve 22. That is, the outer diameter of the sleeve 24 matches the inner diameter of the sleeve 22, and the inner diameter matches the outer diameter of the sliding plate 211 (outer diameter φ57.8) of the transmission rod 21, so that the three can slide freely according to design requirements.

[0063] In actual application, after adjusting the bolt 251 on the connector 25 to a suitable length, tighten the locking nut 252, and then assemble the connector 25 with the sleeve 24 and the disc spring. At this time, the nut of the bolt 251 stops against the sliding plate 211 of the transmission rod 21, generating a pre-pressure, which is the minimum clamping force generated when clamping the high-temperature mold shell 40, thereby preventing the mold shell 40 from falling off. Based on this, by adjusting the length of the nut of the bolt 251 on the connector 25, the pre-pressure can be adjusted according to the actual clamping needs.

[0064] When the clamping jaws 11 are clamped, according to the diameter of the clamping point of the high-temperature mold shell 40, the servo electric cylinder retracts the telescopic end to a certain length. At this time, the tension is transmitted to the transmission rod 21 through the T-type connector 25, the sleeve 24, and the butterfly spring 23, and then the tension is transmitted to the clamping jaws 11 through the transmission connector and the connecting plate 13, and the clamping jaws 11 are closed around their fixed axis. When clamping, multiple butterfly springs 23 have a compression buffering effect, which can effectively protect the servo electric cylinder from the contraction length error and damage the mold shell 40 due to the sudden change in the rigidity of the clamping force of the high-temperature mold shell 40.

[0065] On the other hand, the combination of the connector 25, sleeve 24, butterfly spring 23 and sliding plate 211 of the transmission rod 21 can meet the requirements of minimum clamping force and buffering, and can also meet the rigidity required for a transmission rod of a longer length, making the clamping more stable.

[0066] As can be seen from the above, the extended rod type high temperature resistant mold shell clamp of the exemplary embodiment of the present invention can reach deep into the roasting furnace to grab the mold shell through the extended rod, and can withstand the high temperature of about 1200℃ of the roasting furnace and the hot mold shell itself. The opening angle of the clamping jaws can be adjusted arbitrarily to adapt to different mold shell specifications, and a clamping force adjustment protection device is provided to prevent the mold shell crucible from being crushed due to excessive clamping force and prevent the mold shell from slipping. The clamp works stably, is easy to maintain, safe and environmentally friendly, and provides a guarantee for the consistency of melting and casting quality.

[0067] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. An extended rod type high temperature resistant mold shell fixture, characterized in that: It comprises a sleeve, a transmission rod, a clamping member and a driving device, wherein the clamping member comprises a base and two clamping claws movably arranged on the base, and the sleeve is arranged on the base; The transmission rod is movably arranged on the sleeve, one end of the transmission rod is connected to the two clamping claws, and the other end passes through the base and the sleeve and is connected to the driving device.

2. The clamp according to claim 1, characterized in that: The transmission rod moves in a direction away from or close to the base to close or open the two clamping jaws.

3. The clamp according to claim 2, characterized in that: The clamping jaw has a connecting portion, a hinged portion and a clamping portion in sequence, and the hinged portion of the clamping jaw is hinged on the base; The clamping member further comprises a plurality of connecting plates, one end of each connecting plate is hinged to the transmission rod, and the other end of each connecting plate is hinged to the corresponding connecting portion.

4. The clamp according to claim 3, characterized in that: The number of the connecting plates is two groups, each group of the connecting plates includes two connecting plates, and the two connecting plates in the same group are respectively arranged on two surfaces of the clamping jaws; The clamping member further comprises two groups of ear plates arranged on the base, each group of the ear plates comprises two ear plates, and each of the hinged parts is hinged between the two ear plates of the same group.

5. The clamp according to claim 4, characterized in that: The shape of the clamping surface of the clamping portion is a concave triangle.

6. The clamp according to claim 4, characterized in that: Each pin shaft of the clamping member is sleeved with a rotating sleeve, and the rotating sleeve is made of high-temperature graphite.

7. The clamp according to claim 4, characterized in that: The clamp further comprises a sliding sleeve, wherein the sliding sleeve is arranged in the first through hole of the base, and the transmission rod is slidably arranged in the sliding sleeve.

8. The clamp according to claim 7, characterized in that: The material of the sliding sleeve is high-temperature graphite.

9. The clamp according to any one of claims 1 to 8, characterized in that: The length of the sleeve ranges from 800 mm to 1500 mm.

10. The clamp according to any one of claims 1 to 8, characterized in that: The sleeve, the transmission rod, the base and the clamping jaws are all made of 0Cr25Ni20 stainless steel.

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