Universal turntable with conductive tabletop

Abstract

The present invention belongs to the field of welding, electric spark, arc and other additive and subtractive material manufacturing technology, and discloses a universal turntable with a conductive table top. It includes a workbench, a cooling table, a mandrel, a rotating power supply mechanism, and a base; the rotating power supply mechanism is arranged on the base, and the workbench and the cooling table are connected in order from top to bottom through an insulating connection device; the workbench includes a conductive layer and an insulating layer; a mandrel is arranged on the conductive layer. The device has the characteristics of both insulated water cooling and tabletop power supply.

Description

Technical Field

[0001] The invention belongs to the field of welding, electric spark, arc and other additive and subtractive material manufacturing technology. The invention specifically relates to a high-precision rotary table with a tabletop that can be powered and has insulation performance and a built-in cooling mechanism. Background Art

[0002] The turntable currently in use directly connects the circuit to the workpiece, resulting in the problem of wire entanglement during the rotation of the worktable; if the upper worktable is energized and not insulated, the entire component will be energized, posing a safety hazard; usually, the upper and lower worktables need to be connected with screws to maintain strength and rigidity, but metal screws themselves are conductive and cannot be used. If they are replaced with commonly used plastic, nylon and other screws, the tabletops can be connected but rigidity cannot be guaranteed; the more popular ceramic materials on the market can guarantee rigidity, but the characteristics of ceramics are that they are too rigid and relatively fragile, and the current cost is relatively high, so they are not suitable for connecting screws.

[0003] At the same time, in processes such as welding and EDM, brilliant sparks will generate a lot of heat. High temperature will cause the bearing to expand and deform, affecting the accuracy, increasing friction and affecting the life, and causing the grease to fail. At present, there is a technical gap for a turntable that can be both insulated and cooled and powered on the table. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a universal turntable with a conductive table top, which has the characteristics of both insulation cooling and table top power supply.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a universal turntable with a conductive table surface, comprising a worktable, a cooling table, a mandrel, a rotating power supply mechanism, and a base; the rotating power supply mechanism is arranged on the base, and the worktable and the cooling table are connected in order from top to bottom through an insulating connecting device; the worktable comprises a conductive layer and an insulating layer;

[0006] The conductive layer is provided with a workbench sealing cover and a core shaft; the insulating layer is provided with a sealing plate, an outer sealing ring, an outer sealing ring, and a sealing ring I is provided on the lower surface of the insulating layer;

[0007] The insulating connection device includes an insert a, a screw, a screw plug I, an insert b, and an insert c. The screw plug I is arranged in the conductive layer, and the screw connected to the screw plug I extends into the cooling platform through the conductive layer and the insulating layer. The insert a is arranged in the insulating layer, and the insert b and the insert c are arranged in the cooling platform.

[0008] The cooling platform is provided with a cooling ring groove, and the lower end of the cooling platform is provided with a cooling mechanism; the cooling mechanism includes a cooling chassis, a cooling inlet, and a cooling outlet; the cooling inlet and the cooling outlet are respectively arranged at the two ends of the bottom of the cooling chassis; the cooling chassis is installed on the base, and the cooling mechanism is sealed by a sealing ring II.

[0009] A heat-insulating shielding layer is arranged outside the core shaft, and the heat-insulating shielding layer comprises an inner insulating layer and an outer insulating layer, a shielding net is arranged between the two layers, and the shielding net is connected to the base through connecting screws.

[0010] The top of the heat-insulating shielding layer is a sharp corner, and a support plate and a wire plug II are arranged at the bottom of the heat-insulating shielding layer.

[0011] Furthermore, the sealing plate and the outer sealing ring are arranged at the bottom of the insulating layer, and the sealing ring I and the outer sealing ring are embedded in the lower surface of the insulating layer; the screw passes through and threadedly connects the insert a located in the insulating layer and the insert b located in the cooling platform, and an insert c is provided outside the insert b.

[0012] Furthermore, a grating ruler is provided at the lower end of the cooling platform, and the grating ruler is connected to the cooling chassis through a connecting plate. The grating ruler is used to control the rotation of the motor.

[0013] Furthermore, a motor is provided on the cooling chassis, and a connecting plate connected to the motor is provided inside the cooling chassis; a bearing is provided at the bottom of the cooling platform, and the bottom of the cooling platform is connected to the motor; a side collector is provided at one end of the base; a temperature sensor is also provided at the lower end of the base; an outer shell is provided on the outside of the entire device, and the bottom of the outer shell is connected to the fixed seat.

[0014] Furthermore, a spring pad is provided at the bottom of the screw.

[0015] Furthermore, the insert a and the insert b are made of metal.

[0016] Furthermore, the insert c is made of granite, and is crushed granite gravel.

[0017] Furthermore, the insulating layer is made of artificial granite.

[0018] Furthermore, the outer sealing ring is made of metal.

[0019] Furthermore, a shoulder is provided outside the insert b in the cooling table, and the shoulder is a T-shaped shoulder.

[0020] Furthermore, an external cable is provided at the other end of the base. The base and the wire plug II are made of insulating materials. The insulating material achieves the purpose of insulation and is resistant to high temperatures.

[0021] Furthermore, the cooling chassis includes a chassis and a transition sleeve.

[0022] Furthermore, the sealing ring II is installed on the cooling table and rotates around the cooling base plate during operation. The sealing ring II includes but is not limited to an O-ring, a star ring, and a rotating Gley ring; the present invention preferably uses a rotating Gley ring. By selecting a rotating Gley ring, the friction resistance is reduced and the service life of the turntable is increased.

[0023] Furthermore, the shielding net is used to shield electromagnetic signals. The thickness of the material can be calculated and changed according to actual needs to shield the interference of electromagnetic signals on the encoder and the interference of the generated heat on the parts.

[0024] The outer insulating layer and the inner insulating layer are used for insulation.

[0025] The support plate is used for actual connection force to improve the strength of the parts.

[0026] Furthermore, the shielding mesh material includes but is not limited to aluminum and copper.

[0027] Furthermore, the outer insulating layer and the inner insulating layer include but are not limited to epoxy glue and polytetrafluoroethylene.

[0028] Furthermore, the support plate includes but is not limited to cast iron, structural steel, and alloy steel.

[0029] Furthermore, the heat-insulating shielding layer is manufactured by a two-step casting process:

[0030] The specific production steps are:

[0031] 1) The first casting is to cast the inner insulating layer and make it into the shape required for actual use of the device;

[0032] 2) embedding the hollow cylindrical support plate from the lower end of the inner insulating layer, and wrapping the shielding mesh around the outer side of the embedded inner insulating layer;

[0033] 3) The second casting is to cast an outer insulating layer on the outside and completely wrap it;

[0034] 4) Make the top into a sharp angle.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) Compared with the prior art, the turntable device provided by the present invention can be both insulated and cooled and centrally conductive. The turntable device provided by the present invention transmits power to the worktable surface through the core shaft through a rotating power supply mechanism, effectively avoiding the problem of wire entanglement when the worktable rotates. The insulation setting of the insulating layer avoids the conductive state of the machine body caused by the conductive state of the table surface, thereby improving safety. The lower cooling table set on the turntable solves the problem of bearing heating caused by welding and electric sparks.

[0037] (2) The insulating connection device provided in the turntable device provided by the present invention has better rigidity, is economical and cheap, is easy to install, and has better insulation effect than the prior art. The insulating working principle of the insulating connection device is that the current passing through the work surface is transmitted to the metal insert through the screw, and then is blocked by the granite insert to achieve the purpose of insulation.

[0038] (3) The insulating components provided in the turntable device provided by the present invention make the turntable device itself insulated, which can well protect the internal motor and other parts, and can even protect the peripheral structure from being electrified when high voltage power is supplied.

[0039] (4) The turntable device provided by the present invention achieves a cooling effect by adding an embedded cooling mechanism to balance the heat generated by the electric current during processing, and the cooling medium includes but is not limited to water.

[0040] (5) Due to casting shrinkage and exhaust problems, the cooling treatment device used in the prior art sometimes has tiny pores on the surface of the artificial granite. These pores do not affect the structural strength but cannot be used for cooling liquid sealing. The turntable device provided by the present invention embeds a metal sealing ring on the lower plane of the insulating workbench. It was found in actual operation testing that the coolant can be prevented from leaking and external pollution can be blocked.

[0041] (6) During welding or arc operation, frequent alternating currents will generate a large amount of electromagnetic waves. If the radiation is allowed to proceed, it will interfere with the data line signal. In some high-power situations, it may even heat nearby metal parts, causing local thermal deformation of the parts and affecting the accuracy of the turntable. The temperature is too high and causes sealing failure. In view of this situation, a thermal insulation shielding layer is designed for the device. The thermal insulation shielding layer of the present invention has the advantages of shielding, heat insulation, high temperature resistance, supporting strength and rigidity, and insulation. It is used to bear the weight of the rotating power supply mechanism itself as well as the vibration and friction generated during rotation. The thermal insulation shielding layer also prevents short arcs from causing overheating of steel parts due to eddy currents generated by high-power alternating currents. In addition, a sharp corner is provided at the front end of the thermal insulation shielding layer. When liquid contamination flows downward, it will flow downward along the sharp corner at the front end of the thermal insulation shielding layer, and the inner and outer rings will not be short-circuited due to liquid accumulation.

[0042] (7) The turntable provided by the present invention can be powered by the upper surface, and the artificial marble layer can also play an insulating role. The internal cooling structure can also isolate the heat during operation to protect the bearings and maintain the stability of the bearing accuracy. The turntable is mainly used in harsh environments such as high temperature, where the tabletop power supply and insulation are required. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0044] Figure 1It is a cross-sectional view of the main surface of a universal turntable with a conductive tabletop according to the present invention.

[0045] Figure 2 It is a cross-sectional view of the power supply and insulation device of the present invention.

[0046] Figure 3 It is a cross-sectional view of the insulating connection device of the present invention.

[0047] Figure 4 It is a cross-sectional view of the cooling mechanism and sealing structure of the device of the present invention.

[0048] Figure 5 It is a cross-sectional view of the heat insulation shielding layer of the device of the present invention.

[0049] Figure 6 It is a partial enlarged view of the cable pipeline of the device of the present invention.

[0050] In the figure, 1. conductive layer, 2. insulating layer, 3. cooling table, 4. cooling mechanism, 5. thermal insulation shielding layer, 6. grating scale, 7. bearing, 8. motor, 9. housing, 10 cooling chassis, 11. fixing seat, 12. base, 13. mandrel, 14. temperature sensor, 15. rotating power supply mechanism, 16. side collector, 17. plug I, 18. screw, 19. insert a, 20. insert b, 21. insert c, 22. sealing plate, 23. sealing ring I, 24. outer sealing ring, 25. outer sealing ring, 26. sealing ring II, 27. cooling outlet, 28. cooling inlet, 29. cooling ring groove, 30. insulating threaded hole, 31. sharp corner, 32. shielding net, 33. outer insulating layer, 34. inner insulating layer, 35. support plate, 36. connecting screw, 37. plug II, 38. external cable. DETAILED DESCRIPTION

[0051] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0052] Example 1

[0053] A universal turntable with a conductive table surface, comprising a worktable, a cooling table 3, a mandrel 13, a base 12, and a rotating power supply mechanism 15, wherein the rotating power supply mechanism 15 is arranged on the base 12, and the worktable and the cooling table 3 are connected in order from top to bottom through an insulating connecting device; the worktable comprises a conductive layer 1 and an insulating layer 2;

[0054] The conductive layer 1 is provided with a workbench sealing cover and a core shaft 13; the insulating layer 2 is provided with a sealing plate 22, an outer sealing ring 24, and an outer sealing ring 25, and a sealing ring I 23 is provided on the lower surface of the insulating layer 2;

[0055] The insulating connection device includes an insert a 19, a screw 18, a screw plug I 17, an insert b 20, and an insert c 21. The screw plug I 17 is arranged in the conductive layer 1, and the screw 18 connected to the screw plug I 17 extends through the conductive layer 1 and the insulating layer 2 to the cooling platform 3. The insert a 19 is arranged in the insulating layer 2, and the insert b 20 and the insert c 21 are arranged in the cooling platform 3.

[0056] The cooling platform 3 is provided with a cooling ring groove 29, and the lower end of the cooling platform 3 is provided with a cooling mechanism 4; the cooling mechanism 4 includes a cooling chassis 10, a cooling inlet 28, and a cooling outlet 27; the cooling inlet 28 and the cooling outlet 27 are respectively disposed at the two ends of the bottom of the cooling chassis 10; the cooling chassis 10 is installed on the base 12.

[0057] The core shaft 13 is provided with a heat-insulating shielding layer 5 on the outside. The heat-insulating shielding layer 5 includes an inner insulating layer 34 and an outer insulating layer 33 . A shielding net 32 ​​is provided between the two layers and is connected to the base 12 via connecting screws 36 .

[0058] The top of the heat-insulating shielding layer 5 is a sharp corner 31 , and a support plate 35 and a screw plug II 37 are provided at the bottom of the heat-insulating shielding layer 5 .

[0059] The sealing plate 22 and the outer sealing ring 25 are arranged at the bottom of the insulating layer 2, and the sealing ring I 23 and the outer sealing ring 24 are embedded in the lower surface of the insulating layer 2; the water cooling mechanism 4 is sealed by a rotating Gly ring.

[0060] The screw 18 penetrates through and threadedly connects an insert a 19 located in the insulating layer 2 and an insert b 20 located in the cooling platform 3 , and an insert c 21 is disposed outside the insert b 20 .

[0061] The cooling chassis 10 is provided with a motor 8, and a connecting plate connected to the motor 8 is provided inside the cooling chassis 10; a bearing 7 is provided at the bottom of the cooling table 3, and the bottom of the cooling table 3 is connected to the motor 8; a side collector 16 is provided at one end of the base 12; a temperature sensor 14 is also provided at the lower end of the base 12; a shell 9 is provided on the outside of the entire device, and the bottom of the shell 9 is connected to the fixing seat 11.

[0062] The screw 18 is provided with a spring washer.

[0063] The insert a 19 and the insert b 20 are made of metal.

[0064] The insert c 21 is made of granite gravel.

[0065] The insulating layer 2 is made of artificial granite.

[0066] The outer sealing ring 24 is made of metal.

[0067] The cooling platform 3 is provided with a shoulder outside the insert b 20, and the shoulder is a T-shaped shoulder.

[0068] The overall structure diagram of the device is as follows: Figure 1 As shown: the workbench includes a conductive layer 1, an insulating layer 2, a workbench and a cooling platform. Figure 2 The insulating connection device shown is connected together. The grating ruler 6 and the connecting plate are installed in the inner cavity of the cooling table 3 to control the rotation of the motor 8 and the connecting plate. The motor 8 and the connecting plate drive the cooling table 3 to rotate around the cooling mechanism 4 through the rotating bearing 7. The external power supply is transmitted to the conductive layer 1 through the rotating power supply mechanism 15 and the core shaft 13. The temperature sensor 14 installed on the cooling chassis 10 is used to monitor and protect the processing temperature, and the side collector 16 installed on the cooling chassis 10 is used to recover the waste slag generated by the rotating power supply mechanism 15.

[0069] Power supply device such as Figure 2 As shown, when working, the current flows into the rotating power supply mechanism 15 through the external cable 38, and then flows into the core shaft 13, and is transmitted to the entire conductive layer 1. The rotating power supply mechanism 15 includes but is not limited to brushes, conductive slip rings, etc.

[0070] The current is transmitted from the conductive layer 1 through the screw 18 to the insert b 20 and is blocked by the insert c 21 to achieve insulation.

[0071] Schematic diagram of the insulation connection device Figure 3 As shown: when working, the conductive layer 1 is charged, and the current is transmitted to the marble insulating layer metal insert a 19, the cooling platform metal insert b 20 through the screw 18 and the spring washer, and finally blocked by the cooling platform marble insert c 21 insulating layer to achieve the purpose of insulation. The wire plug I 17 has a sealing function to prevent liquids from flowing into the screw 18 installation hole and causing a short circuit.

[0072] The main function of cooling is to balance the heat generated by the current during processing. In processes such as welding and EDM, brilliant sparks will generate a lot of heat. High temperature will cause the internal expansion and deformation of the bearing to affect the accuracy, the friction will increase and affect the life, and the grease will fail. In order to avoid this problem, embedded cooling is added to the interlayer of cooling table 3 when the device is designed. Cooling mechanism 4 is embedded in cooling table 3. The cooling water below is connected to the workbench through the rotating grid ring to cool the bearing and the upper table. Because the specific heat and thermal conductivity of artificial granite are much lower than water, the cooling amount of the cooling water is fully sufficient for the bearing to work within the allowable temperature range.

[0073] like Figure 4As shown, the upper surface of the cooling table 3 is processed into a cooling ring groove 29, and the inner and outer rings of the sealing plate 22 are sealed with a sealing ring I. The cooling medium enters through the cooling inlet 28 on the cooling chassis 10, and the cooling medium first reaches the rotating Gley ring groove on the cylindrical surface of the workbench, and the cooling medium circulates in the ring groove to cool the cylindrical surface. After filling the ring groove, the cooling medium moves upward to the cooling table 3, circulates in the cooling ring groove 29 on the surface of the cooling table 3, and finally is discharged and returned from the cooling outlet 27. At this point, the entire cooling cycle is completed.

[0074] After the design was completed, it was found in the actual application proofreading that due to casting shrinkage and exhaust problems, tiny pores sometimes appeared on the surface of the insulating layer 2. These pores did not affect the structural strength but would cause liquid sealing leakage; therefore, in actual production, metal sealing rings were embedded in the lower plane of the insulating layer 2: outer sealing ring 25, outer sealing ring 24; the sealing plate 22, sealing ring 23, outer sealing ring 24, outer sealing ring 25 were directly in contact with the cooling table 3 for sealing, and the worktable was connected through the insert b 20 and insert c 21 in the insulating threaded hole 30. It was measured that the cooling medium could not be leaked and external pollution could be blocked.

[0075] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made on the basis of the scheme of the present invention are all within the scope of protection claimed by the present invention.

Claims

1. A universal turntable with a conductive table top, characterized in that: The invention comprises a workbench, a cooling table (3), a core shaft (13), a base (12), and a rotating power supply mechanism (15), wherein the rotating power supply mechanism (15) is arranged on the base (12), and the workbench and the cooling table (3) are connected in sequence from top to bottom via an insulating connection device; the workbench comprises a conductive layer (1) and an insulating layer (2); The conductive layer (1) is provided with a core shaft (13); the insulating layer (2) is provided with a sealing plate (22), an outer sealing ring (24), an outer sealing ring (25), and a sealing ring I (23) is provided on the lower surface of the insulating layer (2); The insulating connection device comprises an insert a (19), a screw (18), a screw plug I (17), an insert b (20), and an insert c (21), wherein the screw plug I (17) is arranged in the conductive layer (1), the screw (18) connected to the screw plug I (17) extends through the conductive layer (1) and the insulating layer (2) to the cooling platform (3), the insert a (19) is arranged in the insulating layer (2), and the insert b (20) and the insert c (21) are arranged in the cooling platform (3); The cooling platform (3) is provided with a cooling ring groove (29), and a cooling mechanism (4) is provided at the lower end of the cooling platform (3); the cooling mechanism (4) comprises a cooling base (10), a cooling inlet (28), and a cooling outlet (27); the cooling inlet (28) and the cooling outlet (27) are respectively disposed at two ends of the bottom of the cooling base (10), the cooling base (10) is mounted on a base (12), and the cooling mechanism (4) is sealed by a sealing ring II (26); The core shaft (13) is provided with a heat-insulating shielding layer (5) on the outside, the heat-insulating shielding layer (5) comprising an inner insulating layer (34) and an outer insulating layer (33), a shielding net (32) is provided between the two layers, and the shielding net (32) is connected to the base (12) via connecting screws (36); The sealing ring II (26) is a rotating Glay ring.

2. A universal turntable with a conductive tabletop as claimed in claim 1, characterized in that: The top of the heat-insulating shielding layer (5) is a sharp corner (31), and the bottom of the heat-insulating shielding layer (5) is provided with a support plate (35) and a wire plug II (37).

3. A universal turntable with a conductive tabletop as claimed in claim 2, characterized in that: The sealing plate (22) and the outer sealing ring (25) are arranged at the bottom of the insulating layer (2), and the sealing ring I (23) and the outer sealing ring (24) are embedded in the lower surface of the insulating layer (2).

4. A universal turntable with a conductive tabletop as claimed in claim 3, characterized in that: The screw (18) penetrates through and threadedly connects an insert a (19) located in the insulating layer (2) and an insert b (20) located in the cooling platform (3), and an insert c (21) is provided outside the insert b (20).

5. A universal turntable with a conductive tabletop as claimed in claim 4, characterized in that: The cooling chassis (10) is provided with a motor (8), and a connecting plate connected to the motor (8) is provided inside the cooling chassis (10); a bearing (7) is provided at the bottom of the cooling table (3), and the bottom of the cooling table (3) is connected to the motor (8); a side collector (16) is provided at one end of the base (12); a temperature sensor (14) is also provided at the lower end of the base (12); and a shell (9) is provided outside the entire device, and the bottom of the shell (9) is connected to a fixing seat (11).

6. A universal turntable with a conductive tabletop as claimed in any one of claims 1 to 5, characterized in that: A spring pad is provided at the screw (18); the insert a (19) and the insert b (20) are made of metal; the insert c (21) is made of granite gravel; the insulating layer (2) is made of artificial granite; the outer sealing ring (24) is made of metal; a shoulder is provided inside the cooling platform (3) outside the insert b (20), and the shoulder is T-shaped; the base (12) and the screw plug II (37) are made of insulating material.

7. A universal turntable with a conductive tabletop as claimed in claim 1 or 2, characterized in that: The heat-insulating shielding layer (5) is manufactured by casting in two steps: The specific production steps are: 1) The first casting is to cast the inner insulating layer (34) into a shape required for actual use of the device; 2) embedding the hollow cylindrical support plate (35) from the lower end of the inner insulating layer (34), and wrapping the shielding net (32) outside the embedded inner insulating layer (34); 3) The second casting is to cast an outer insulating layer (33) on the outside and completely wrap it; 4) Make the top into a sharp corner (31).

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