A high temperature resistant formwork clamp with an extended rod

Abstract

The application provides a lengthened rod type high-temperature-resistant mold shell clamp, and relates to the technical field of casting, which aims at solving the technical problem that hot mold shells are easily broken or dropped during the process of investment casting. 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 and is connected with the driving device, the transmission rod moves along the direction away from or close to the base to make the two clamping jaws close or open, the clamping jaws successively have a connecting part, a hinged part and a clamping part, and the hinged part of the clamping jaws is hinged on the base. The clamping piece further comprises a plurality of connecting plates, one end of the connecting plate is hinged with the transmission rod, and the other end of the connecting plate is hinged with the corresponding connecting part. The number of the connecting plates is two groups. The clamp can effectively avoid the shrinkage error of the driving device, so that the clamping force is suddenly changed in rigidity and the mold shell is damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting, in particular to a lengthened rod type high-temperature-resistant mold shell clamp. BACKGROUND

[0002] Near-net material refers to a material that, in the manufacturing process, is shaped close to the final shape and size through a specific forming technique, thereby reducing subsequent processing procedures and material waste.

[0003] Investment casting is a precision casting method, which uses a fusible material to make a model, coats the model with several layers of refractory coating, dries and hardens the model into an integrated shell, then heats the shell to melt the model, and then bakes the shell at high temperature to become a refractory shell. Pour liquid metal into the shell, and after cooling, the casting is formed.

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

[0005] In related technologies, when the hot mold shell is clamped, the mold shell is often clamped and broken or falls off. SUMMARY

[0006] The purpose of the present application is to provide a lengthened rod type high-temperature-resistant mold shell clamp to solve the technical problem of easy clamping and breaking or falling off of the hot mold shell in the process of investment casting.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] The present application provides a lengthened rod type high-temperature-resistant mold shell clamp, which 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.

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

[0010] According to at least one embodiment of the present application, the transmission rod moves in the 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 application, the clamping jaws have a connecting part, a hinged part and a clamping part in sequence, and the hinged part of the clamping jaws is hinged on the base.

[0012] The clamping member further comprises a plurality of connecting plates, one end of the connecting plates is hingedly connected with the transmission rod, and the other end is hingedly connected with the corresponding connecting portion.

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

[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 hinged portion is hingedly connected between the two ear plates in the same group.

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

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

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

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

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

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

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

[0022] According to at least one embodiment of the present application, the clamping member further comprises an adjusting device, the transmission rod is drivingly connected with the driving device through the adjusting device, the adjusting device comprises a connecting head, a sleeve, a butterfly spring, a bolt and a locking nut, and the sleeve is slidingly arranged in the sleeve pipe.

[0023] According to at least one embodiment of the present application, the end plate of the sleeve away from the connecting head is provided with a second through hole for the transmission rod to pass through, the end of the transmission rod located in the sleeve has a sliding plate matched with the sleeve, the butterfly spring is sleeved on the transmission rod and located between the sliding plate and the end plate.

[0024] One end of the connecting head is connected with the driving device, and the other end is connected with the sleeve, the bolt is arranged at the end of the connecting head 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 application, the locking nut is sleeved on the bolt and abuts against the end surface of the connecting head.

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

[0027] The length of the elongated rod type high-temperature-resistant formwork clamp in the exemplary embodiments of the present application is 800mm-1500mm, so that the formwork can be grabbed inside the roasting furnace. Specifically, the clamp is composed of a sleeve, a transmission rod, a clamping piece and a driving device, wherein the driving device is arranged at one end of the sleeve, the clamping piece is arranged at the other end of the sleeve, the driving device and the clamping piece are connected through the transmission rod, and the transmission rod can move in the sleeve under the driving of the driving device. When the transmission rod moves towards the base, the transmission rod can drive the two clamping jaws to open; when the transmission rod moves away from the base, the transmission rod can drive the two clamping jaws to close and clamp the formwork.

[0028] Further, an adjusting device is arranged between the driving device and the transmission rod to buffer the rigid mutation of the clamping force of the clamping jaws on the formwork, so as to reduce the probability of damaging the formwork. Specifically, the adjusting device includes a connecting head, a sleeve, a butterfly spring, a bolt and a locking nut, the sleeve is slidingly arranged in the sleeve, an end plate of the sleeve away from the connecting head is provided with a second through hole for the transmission rod to pass through, an end of the transmission rod located in the sleeve has a sliding plate matched with the sleeve, the butterfly spring is sleeved on the transmission rod and located between the sliding plate and the end plate, one end of the connecting head is connected with the driving device, and the other end is connected with the sleeve, the bolt is arranged at the end of the connecting head away from the driving device, and the nut of the bolt abuts against the sliding plate. When the two clamping jaws are clamped, the compression buffering effect of the butterfly spring can effectively protect the formwork from being damaged by the rigid mutation of the clamping force of the formwork caused by the contraction length error of the driving device. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings illustrate exemplary embodiments of the present application and together with the description, explain the principles of the application, wherein:

[0030] Figure 1 is a front view structural schematic diagram of a clamp and a mechanical arm according to an embodiment of the present application;

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

[0032] Figure 3 is a schematic view of a front structure of a clamp according to an embodiment of the present application;

[0033] Figure 4 is Figure 2 is a partial enlarged view of A part of

[0034] Figure 5 is Figure 3 is a partial enlarged view of B part of

[0035] Figure 6 is Figure 3 is a partial enlarged view of C part of

[0036] Reference signs:

[0037] 10, clamping piece; 11, clamping jaw; 111, connecting part; 112, hinged part; 113, clamping part; 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, sleeve; 23, butterfly spring; 24, sleeve; 241, end plate; 25, connecting head; 251, bolt; 252, locking nut;

[0039] 30, mechanical arm;

[0040] 40, formwork. DETAILED DESCRIPTION

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

[0042] At present, the methods for clamping hot state formwork include manual clamping method and robot grabbing method. In the manual clamping method, workers wear protective clothing and hold a few meters long fork-shaped clamp to clamp the formwork. This method has high labor intensity, poor working environment, and often causes the hot state formwork to be knocked down. In the robot grabbing method, a pneumatic clamp or a servo motor driven clamp is used. However, the pneumatic clamp cannot change the stroke, the opening size is fixed, and it cannot dynamically adapt to different specifications of the formwork, so that the position interval of multiple specifications of the formwork is limited when placed in the baking furnace. At the same time, the robot grabbing method often causes the formwork to be clamped and broken or fallen off when clamping the hot state formwork.

[0043] In view of the above problems, the lengthened rod type high temperature resistant formwork clamp of the exemplary embodiment of the present application sets a buffer structure between the driving device and the transmission rod for controlling the opening and closing of the two clamping jaws, so as to effectively prevent the problem of damage to the formwork caused by sudden change of clamping force.

[0044] Figure 1 is a schematic diagram of the structure of the clamp and the mechanical arm according to the embodiment of the present application. Referring to Figure 1 , the clamp of the exemplary embodiment of the present application can be arranged at the end of the mechanical arm 30 through a flange, and the clamp is arranged with a clamping piece 10 in the form of a long rod at its end, which can be deep into the baking furnace to take out the hot mold shell 40, so as to reduce the labor intensity of the personnel manually clamping, and also avoid the situation that the personnel often knock down the hot mold shell 40.

[0045] Figure 2 is a schematic diagram of the structure of the clamp according to the embodiment of the present application; Figure 4 is Figure 2 , the A part is a partial enlarged view; Figure 3 is a schematic diagram of the structure of the clamp according to the embodiment of the present application; Figure 5 is Figure 3 , the B part is a partial enlarged view. As Figures 2-5 shown, the long rod type high temperature resistant mold shell clamp of the exemplary embodiment of the present application comprises a sleeve 22, a transmission rod 21, a clamping piece 10 and a driving device, the clamping piece 10 comprises 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 in the sleeve 22, one end of the transmission rod 21 is connected with the two clamping jaws 11, and the other end passes through the base 12 and the sleeve 22 and is connected with the driving device.

[0046] In actual application, the driving device is a servo electric cylinder, and the end of the transmission rod 21 away from the clamping jaws 11 is connected with the telescopic end of the servo electric cylinder. Compared with the pneumatic clamp in the prior art, the servo electric cylinder can adjust the stroke of the telescopic end according to actual needs, and by changing the stroke of the telescopic end, the opening size of the clamping piece 10 can be adjusted, so that different specifications of the mold shell 40 can be dynamically adapted, and the position distance of the multiple specifications of the mold shell 40 when placed in the baking furnace is not limited.

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

[0048] As 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 piece 10 further comprises a plurality of connecting plates 13, one end of the connecting plate 13 is hinged with the transmission rod 21, and the other end is hinged with the corresponding connecting portion 111.

[0049] Specifically, the number of the connecting plates 13 is two groups, each group of the connecting plates 13 comprises two connecting plates 13, and the two connecting plates 13 of the same group are respectively arranged on the two surfaces of the clamping jaw 11; the clamping piece 10 further comprises two groups of lug plates 121 arranged on the base 12, each group of the lug plates 121 comprises two lug plates 121, and each hinged portion 112 is hinged between the two lug plates 121 of the same group.

[0050] Each clamping jaw 11 corresponds to a group of lug plates 121, and the hinged portion 112 of the clamping jaw 11 is rotatably arranged between the lug plates 121 of the corresponding same group through the pin shaft 131. The hinged portion 112 is located at the outer side of the connecting portion 111, and the transmission rod 21 is located at the middle position between the two groups of lug plates 121. The connecting portion 111 of each clamping jaw 11 is hinged with one end of the connecting plate 13 through the pin shaft 131, and the other end of the connecting plate 13 is hinged with the transmission rod 21. The two connecting plates 13 of the same group are respectively located on the two opposite surfaces of the clamping jaw 11, i.e. the 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 an inwardly recessed triangle. That is, the opposite surfaces of the two clamping portions 113 are both in the shape of an inwardly recessed triangle, which can automatically adapt to different specifications and diameters of the mold shell 40.

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

[0053] In some embodiments, the clamp further comprises a sliding sleeve 122 arranged in the first through hole of the base 12, and the transmission rod 21 is slidingly arranged in the sliding sleeve 122. The portion of the transmission rod 21 passing through the sliding sleeve 122 can be further provided with a transmission connecting piece, and the transmission rod 21 is indirectly hinged with the two clamping jaws 11 through the transmission connecting piece. The transmission connecting piece can still freely slide in the sliding sleeve 122 at a high temperature of about 1200℃, maintaining flexibility.

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

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

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

[0057] Figure 6 is Figure 3 a partial enlarged view of the C part. As shown in Figure 6 , the clamp further includes an adjusting device, the transmission rod 21 is in transmission connection with the driving device through the adjusting device, the adjusting device includes the connector 25, the sleeve 24, the disc spring 23, the bolt 251 and the locking nut 252, and the sleeve 24 is slidingly arranged in the sleeve pipe 22.

[0058] Exemplarily, the end plate 241 of the sleeve 24 away from the connector 25 is provided with a second through hole for the transmission rod 21 to pass through, the end of the transmission rod 21 located in the sleeve 24 has a sliding plate 211 matched with the sleeve 24, the disc spring 23 is sleeved on the transmission rod 21 and located between the sliding plate 211 and the end plate 241; one end of the connector 25 is connected with the driving device, and the other end is connected with the sleeve 24, the bolt 251 is arranged at the end of the connector 25 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 abuts against the end face of the connector 25.

[0059] In actual application, one end of the T-shaped connector 25 is connected with the push rod U-shaped head of the servo electric cylinder, and the other end is screwed with the inner wall of the sleeve 24 at a position close to the end, which is convenient for disassembly and assembly, and a threaded hole is arranged on the end face of the T-shaped connector 25, the threaded hole is M8 deep 26mm, a bolt 251 with adjustable screwing depth is arranged 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 arranged on the bolt 251 for locking and limiting the bolt 251, so that the nut keeps a set distance with the connector 25.

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

[0061] The disc spring 23 is located in the sleeve 24 and is limited 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, it can be 4, 6, 8, 12, etc., and the specification is 56x28.5x2x4.1, and the material is 60Si2MnA.

[0062] Exemplarily, the sleeve 24 is made of Q235B steel, with an inner diameter of φ58 mm and an outer diameter of φ65.8 mm, and is slidably arranged 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 (with an outer diameter of φ57.8) of the transmission rod 21, so that the three can freely slide according to design requirements.

[0063] In actual application, after the bolt 251 on the connecting head 25 is adjusted to a proper length, the locking nut 252 is fastened, and then the connecting head 25 is assembled with the sleeve 24 and the disc spring, at this time, the screw cap of the bolt 251 abuts against the sliding plate 211 of the transmission rod 21, generating a pre-pressure, which is the minimum clamping force generated when the high-temperature mold shell 40 is clamped, thereby preventing the mold shell 40 from falling off. Based on this, by adjusting the length of the screw cap of the bolt 251 on the connecting head 25, the pre-pressure can be adjusted according to actual clamping requirements.

[0064] When the clamping jaw 11 is clamped, according to the clamping point diameter of the high-temperature mold shell 40, the servo electric cylinder retracts the extension end by a certain length, at this time, the tension is transmitted to the transmission rod 21 through the T-shaped connecting head 25, the sleeve 24 and the disc spring 23, and then the tension is transmitted to the clamping jaw 11 through the transmission connecting piece and the connecting plate 13, and then the clamping jaw 11 closes around the fixed shaft. The plurality of disc springs 23 have a compression buffering effect when clamping, which can effectively protect the servo electric cylinder from the error of the retraction length, and prevent the high-temperature mold shell 40 from being damaged due to the sudden change of the clamping force.

[0065] On the other hand, by the combination of the connecting head 25, the sleeve 24, the disc spring 23 and the sliding plate 211 of the transmission rod 21, the minimum clamping force and the buffering requirement can be met, and the rigidity required by the transmission rod with a large length can also be met, so that the clamping is more stable.

[0066] As can be seen from the above, the lengthened rod type high-temperature mold shell clamp of the exemplary embodiment of the present application can reach the inside of the baking furnace to grab the mold shell through the lengthened rod, can withstand the high temperature of about 1200℃ of the baking furnace and the hot mold shell itself, can adjust the opening angle of the clamping jaw at will to adapt to different specifications of the mold shell, and is provided with a clamping force adjusting and protecting device, which can prevent the mold shell from being broken due to excessive clamping force and can prevent the mold shell from falling off. The clamp is stable in work, convenient to maintain, safe and environmentally friendly, and can provide guarantee for the consistency of the fused cast quality.

[0067] Those skilled in the art should understand that the above embodiments are only for clearly illustrating the present application, and are not intended to limit the scope of the present application. Based on the above disclosure, other changes or modifications can also be made by those skilled in the art, and these changes or modifications are still within the scope of the present application.

Claims

1. An extended pole high temperature resistant formwork clamp characterized in that, The 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, and the other end of the transmission rod penetrates through the base and the sleeve and is connected with the driving device; The transmission rod moves in a direction away from or close to the base to close or open the two clamping jaws; The clamping jaw sequentially comprises a connecting part, a hinged part and a clamping part, and the hinged part of the clamping jaw is hinged on the base; The clamping piece further comprises a plurality of connecting plates, one end of the connecting plate is hinged with the transmission rod, and the other end of the connecting plate is hinged with the corresponding connecting part; The driving device is a servo electric cylinder, and the end of the transmission rod away from the clamping jaw is connected with the telescopic end of the servo electric cylinder; The clamp further comprises an adjusting device, the transmission rod is in transmission connection with the driving device through the adjusting device, the adjusting device comprises a connecting head, a sleeve, a butterfly spring, a bolt and a locking nut, and the sleeve is slidably arranged in the sleeve; the end plate of the sleeve away from the connecting head is provided with a second through hole for the transmission rod to pass through, the end of the transmission rod located in the sleeve has a sliding plate matched with the sleeve, the butterfly spring is sleeved on the transmission rod and located between the sliding plate and the end plate; One end of the connecting head is connected with the driving device, the other end of the connecting head is connected with the sleeve, the bolt is arranged at the end of the connecting head away from the driving device, and the nut of the bolt abuts against the sliding plate.

2. The clamp of claim 1, wherein The number of the connecting plates is two groups, each group of the connecting plates comprises two connecting plates, and the two connecting plates in the same group are arranged on two surfaces of the clamping jaw respectively; The clamping piece further comprises two groups of ear plates arranged on the base, each group of the ear plates comprises two ear plates, and each hinged part is hinged between two ear plates in the same group.

3. The clamp of claim 2, wherein The shape of the clamping surface of the clamping part is an inwardly recessed triangle.

4. The clamp of claim 2, wherein Each pin shaft of the clamping piece is sleeved with a rotating sleeve, and the material of the rotating sleeve is high-temperature graphite.

5. The clamp of claim 2, wherein 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.

6. The clamp of claim 5, wherein The material of the sliding sleeve is high-temperature graphite.

7. The clamp of any one of claims 1-6, wherein, The length of the sleeve ranges from 800mm to 1500mm.

8. The clamp of any one of claims 1-6, wherein, The materials of the sleeve, the transmission rod, the base and the clamping jaw are all 0Cr25Ni20 stainless steel.

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