Grid plate electric heater

Abstract

The invention discloses a grid plate electric heater which comprises a heating assembly, a supporting assembly and a porous ceramic supporting base, the heating assembly comprises a grid plate and electrode rods, the electrode rods are arranged on the side edges of the two ends of the grid plate in the length direction, the grid plate is spirally wound and arranged on the porous ceramic supporting base, and the supporting assembly is arranged on the porous ceramic supporting base. The grid plates are vertically arranged on the porous ceramic supporting base, the supporting assembly comprises supporting rods and supporting blocks, the supporting rods and the supporting blocks are made of insulating materials, the supporting blocks are arranged on the same sides of the two ends of the supporting rods, the supporting rods are arranged between every two adjacent layers of grid plates, and the supporting rods make contact with the grid plates on the outer side. The supporting blocks make contact with the grid plate on the inner side, and a plurality of rows of supporting assemblies are arranged on the heating assembly wound into the cylinder in the radius direction. The electric heater has the advantages that the electric heater can be conveniently machined, and the production cost and raw material loss of the electric heater are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electric heating, and in particular to a grid plate electric heater. Background Art

[0002] An electric heater is a device used for electric heating, usually containing several heating rods for heating. It is used to increase the temperature, keep warm, and heat the flowing liquid or gaseous medium. When the heating medium passes through the heating chamber of the electric heater under pressure, the huge heat generated by the electric heating element is evenly taken away by the principle of fluid thermodynamics, so that the temperature of the heated medium meets the user's process requirements.

[0003] Currently, during the heating process of the electric heater, a plurality of heating rods need to be processed and assembled separately to realize the production of the electric heater.

[0004] With respect to the above-mentioned related technologies, the inventor believes that in the production process of the above-mentioned electric heater, on the one hand, it is relatively complicated to process several heating rods individually, which reduces the production efficiency of the electric heater. On the other hand, in the process of producing the heating rods, a lot of waste is generated, which increases the production cost of the electric heater. Summary of the invention

[0005] In order to facilitate the processing of electric heaters and reduce the production cost and raw material loss of electric heaters, the present application provides a grid plate electric heater.

[0006] The present application provides a grid plate electric heater adopting the following technical solution: A grid plate electric heater comprises a heating component, a support component and a porous ceramic support base, wherein the heating component comprises a grid plate and an electrode rod, wherein the electrode rod is provided on the sides at both ends of the grid plate in the length direction, the length of the electrode rod is greater than the width of the grid plate, the grid plate is spirally wound and arranged on the porous ceramic support base, and the grid plate is vertically arranged on the porous ceramic support base, the support component comprises a support rod and a support block, the support rod and the support block are made of insulating material, and the support block is provided on the same side of both ends of the support rod, the support rod is arranged between two adjacent layers of the grid plates, the support rod contacts the outer grid plate, and the support block contacts the inner grid plate, and the support component is provided with a plurality of groups between the two adjacent layers of the grid plates, and a plurality of groups of the support components are provided with a plurality of rows along the radial direction on the heating component wound into a cylindrical shape.

[0007] By adopting the above technical solution, a grid plate is used as an electric heating element, and the grid plate of appropriate length is cut according to actual needs for use, so that there is basically no waste of raw materials in the production process. The setting of the grid plate increases the resistance of the heating element, making the electric heating process faster. The spirally wound grid plate is arranged on a porous ceramic support base. The support assembly is arranged between two adjacent layers of grid plates to maintain the spacing between the two adjacent grid plates. The possibility of contact between the two adjacent layers of grid plates, which causes the grid plate to be damaged by a short circuit during the power-on process, is reduced. Through the mutual cooperation of the heating assembly, the support assembly and the porous ceramic support base, it is convenient to process the electric heater, reduce the production cost of the electric heater and the loss of raw materials.

[0008] Optionally, a plug-in rod is provided on the electrode rod located in the middle of the heating assembly, and the plug-in rod is vertically arranged at the bottom end of the electrode rod. A plug-in hole is opened on the top surface of the porous ceramic support base, and the plug-in rod is inserted into the plug-in rod.

[0009] By adopting the above technical solution, the arrangement of the plug-in rod and the plug-in hole realizes the position limitation of the electrode rod in the middle position, which facilitates the winding of the grid plate and the placement of the support assembly in the subsequent process.

[0010] Optionally, the grid plate includes a first density board and a first density board, and a side edge of the first density board on one side in the width direction is arranged to fit with a side edge of the second density board on one side in the width direction.

[0011] By adopting the above technical solution, grid plates with different power densities can be used for different heating zones. The power densities of the first density plate and the second density plate are different. A high power density grid plate is used in a low temperature zone, and a low power density grid plate is used in a high temperature zone. The setting of the first density plate and the second density plate expands the application range of the device.

[0012] Optionally, a receiving groove is provided on the side of the support block away from the support rod, an abutment block is slidably provided in the receiving groove, a first elastic member is provided between the abutment block and the inner bottom wall of the receiving groove, and an adjustment component for driving the abutment block to move in the receiving groove is provided on the porous ceramic base.

[0013] By adopting the above technical solution, for grid plates of different specifications, in order to prevent short circuits caused by the spacing between two adjacent grid plates being too close, it is necessary to adjust the spacing between two adjacent grid plates. By adjusting the position of the abutment block in the receiving groove by adjusting the component, the overall thickness of the bottom of the support component is adjusted, and the grid plates slide relatively between two adjacent groups of support components, so as to adjust the spacing between two adjacent grid plates, thereby expanding the scope of application of the device.

[0014] Optionally, the adjustment assembly includes a lifting ring, a sliding rod, a sliding block, a fixed block and an extrusion block. The lifting ring is horizontally arranged above the heating assembly. A plurality of sliding rods are arranged on the lifting ring along the radial direction. The plurality of sliding rods correspond one to one with the plurality of rows of support assemblies in the vertical direction. One fixed block is fixedly arranged on each sliding rod. A plurality of sliding blocks are slidably arranged on each sliding rod. A plurality of sliding blocks are arranged on a side of the fixed block close to the lifting ring. The fixed block and the adjacent sliding blocks, as well as the two adjacent sliding blocks, are arranged in a vertical direction. A first elastic member is arranged between each of the plurality of extrusion blocks, one of the extrusion blocks is arranged on the bottom surface of the fixed block and the plurality of sliding blocks, an extrusion slope is arranged on the side of the extrusion block close to the central axis of the lifting block, an abutment slope is arranged on the top end of the abutment block close to the bottom wall of the receiving groove, a connecting port is arranged on the top surface of the support block located above, and the connecting port is connected to the corresponding receiving groove, and in a natural state, a plurality of the extrusion blocks are arranged corresponding to the plurality of the connecting ports in the vertical direction, and a driving member for driving the lifting ring to move in the vertical direction is arranged on the porous ceramic support base.

[0015] By adopting the above technical solution, when the spacing between two adjacent layers of grid plates needs to be expanded, the lifting ring moves downward under the driving action of the driving member. The extrusion block extends into the corresponding receiving groove through the connecting port, and the extrusion inclined surface of the extrusion block and the abutment inclined surface of the abutment block contact each other and slide relative to each other. The abutment block moves in a direction away from the bottom wall of the receiving groove under the driving action of the extrusion block. At this time, the sliding block slides on the sliding rod, and the setting of the adjustment component realizes the simultaneous adjustment of the positions of several abutment blocks in the receiving groove.

[0016] Optionally, in the same group of the support components, a linkage rod is vertically connected between the abutment block located above and the abutment block located below, a first waist-shaped hole connected to the accommodating groove is opened on the bottom surface of the support block located above, and a second waist-shaped hole connected to the accommodating groove is opened on the top surface of the support block located below, and both ends of the linkage rod are slidably disposed in the first waist-shaped hole and the second waist-shaped hole, respectively.

[0017] By adopting the above technical solution, the setting of the linkage rod enables the abutment block located above and the abutment block located below to move synchronously, thereby achieving stable support for the upper and lower sides of the grid plate.

[0018] Optionally, a sliding roller is rotatably provided at the bottom end of the support rod, and a plurality of first limiting grooves are provided on the top surface of the porous ceramic support base along the length direction of the plurality of rows of support components. The plurality of first limiting grooves are arranged in one-to-one correspondence with the plurality of rows of support components, and the sliding roller is slidably arranged in the corresponding first limiting grooves.

[0019] By adopting the above technical solution, when the thickness of the support assembly is adjusted, the support rod slides relatively on the porous ceramic support base, and the sliding roller moves in the first limiting groove. The setting of the first limiting groove realizes the limiting guidance of the support rod movement process.

[0020] Optionally, a clamping assembly is provided on the electrode rod, and the clamping assembly includes a clamping spring and a sliding arc rod. A mounting groove for accommodating the grid plate is provided on the electrode rod along the length direction. The clamping spring is arranged in the mounting groove, and one side of the clamping spring is connected to the inner edge of the mounting groove. The sliding arc rod is connected to the clamping spring, and the sliding arc rod passes through the electrode rod and is slidably connected thereto. One end of the sliding arc rod extends out of the electrode rod. In a natural state, the clamping spring presses the grid plate against the inner wall of the mounting groove.

[0021] By adopting the above technical solution, when replacing and clamping the grid plate, the end of the sliding arc rod extending from the electrode rod is pulled outward, and the clamping spring is separated from the inner wall of the installation groove. One end of the grid plate in the length direction is inserted into the installation groove, the sliding arc rod is released, and the clamping spring presses the grid plate against the inner wall of the installation groove, thereby realizing a stable and fast connection of the grid plate.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the heating component, the supporting component and the porous ceramic supporting base, it is convenient to process the electric heater and reduce the production cost and raw material loss of the electric heater; 2. The setting of the adjustment component realizes the simultaneous adjustment of the positions of several abutment blocks in the receiving groove; 3. The setting of the clamping assembly realizes the stable and fast connection of the grid plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a grid plate electric heater used in Example 1 of the present application.

[0024] Figure 2 It is a partial cross-sectional view used to illustrate the plug hole in Example 1 of the present application.

[0025] Figure 3It is a structural schematic diagram used to embody a grid plate electric heater in Example 2 of the present application.

[0026] Figure 4 It is a partial cross-sectional view used to illustrate the adjustment component in Example 2 of the present application.

[0027] Figure 5 yes Figure 4 Enlarged view of part A in the middle.

[0028] Figure 6 yes Figure 4 Enlarged view of part B in the middle.

[0029] Figure 7 yes Figure 4 Enlarged view of part C in the middle.

[0030] Description of reference numerals: 1. Heating assembly; 101. Grid plate; 1011. First density plate; 1012. Second density plate; 102. Electrode rod; 2. Support assembly; 21. Support block; 211. Accommodating groove; 212. First waist-shaped hole; 213. Second waist-shaped hole; 214. Connecting port; 22. Support rod; 23. Abutment block; 24. Support tension spring; 25. Linking rod; 26. Limiting rod; 27. Sliding roller; 3. Porous ceramic support base; 31. Plug hole; 3 2. First limit slide groove; 33. Second limit slide groove; 4. Plug-in rod; 5. Adjustment assembly; 51. Lifting ring; 52. Adjustment frame; 53. Lifting rod; 54. Sliding rod; 55. Sliding block; 56. Connecting spring; 57. Fixed block; 58. Mounting rod; 59. Extrusion block; 6. Clamping assembly; 61. Clamping spring; 62. Sliding arc rod; 63. Pull block; 7. Drive motor; 8. Drive screw; 9. Guide rod; 10. Limit block; 11. Scale line; 12. Mounting groove. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-7 The present application is further described in detail. The present application provides a grid plate electric heater, which has the effect of facilitating the processing of the electric heater and reducing the production cost and raw material loss of the electric heater.

[0032] Example 1 Reference Figure 1A grid plate electric heater includes a heating component 1, a support component 2 and a porous ceramic support base 3. The heating component 1 includes a grid plate 101 and an electrode rod 102. The grid plate 101 includes a first density plate 1011 and a second density plate 1012. The side edge of the first density plate 1011 on one side in the width direction is connected to the side edge of the second density plate 1012 on one side in the width direction. The power density of the first density plate 1011 and the second density plate 1012 are different. An electrode rod 102 is connected to each side edge at both ends of the length direction of the grid plate 101. One end of the electrode rod 102 is flush with the edge of the grid plate 101, and the other end extends out of the edge of the grid plate 101.

[0033] Reference Figure 1 and Figure 2 The grid plate 101 is vertically arranged on the porous ceramic support base 3. The grid plate 101 is spirally wound on the porous ceramic support base 3. The grid plate 101 is wound into a cylindrical electric heating element. The bottom end of the electrode rod 102 located at the center is vertically connected to the plug rod 4. The top surface of the porous ceramic support base 3 is provided with a plug hole 31, and the plug rod 4 is inserted into the plug hole 31.

[0034] Reference Figure 1 and Figure 2 , the support assembly 2 is arranged between two adjacent layers of grid plates 101, and the support assembly 2 includes a support block 21 and a support rod 22. The support rod 22 and the support block 21 are made of insulating material (ceramic is used as the raw material in the embodiment of the present application). A support block 21 is arranged on the same side of both ends of the support rod 22, and the support rod 22 is arranged in contact with the inner wall of the grid plate 101 located on the outside, and the end of the support block 21 away from the support rod 22 is arranged in contact with the outer wall of the grid plate 101 located on the inside. The support assembly 2 is arranged in several rows along the radial direction of the cylindrical heating assembly 1, and the grid plate 101 is sandwiched between the support rod 22 and the support block 21 of the two adjacent groups of support assemblies 2.

[0035] The implementation principle of a grid plate electric heater in Example 1 of the present application is: by using a grid plate 101 as a heating element, the grid plate 101 can be cut to a suitable length according to actual needs during the production process, and there is almost no waste of raw materials in the production process, thereby reducing the production cost of the device. In addition, using the grid plate 101 as a heating element increases the resistance of the heating element, which helps to improve the heating efficiency of the device.

[0036] The support assembly 2 is arranged between two adjacent layers of grids, and the support rod 22 and the support blocks 21 arranged at both ends thereof support the grid plate 101 at the same time, reducing the possibility of mutual contact between the two adjacent layers of grid plates 101, causing circuit short circuit and damage to the grid plate 101.

[0037] Example 2 Reference Figure 3 and Figure 4 The difference between the second embodiment and the first embodiment is that it further includes an adjustment component 5 and a clamping component 6. Figure 5 and Figure 6 The support assembly 2 also includes an abutment block 23 , a support tension spring 24 , a linkage rod 25 , a limit rod 26 and a sliding roller 27 .

[0038] Reference Figure 5 and Figure 6 , a receiving groove 211 is provided at one end of the support block 21 away from the support rod 22, one end of the abutment block 23 is slidably disposed in the receiving groove 211, and the other end extends out of the receiving groove and abuts against the grid plate 101, and the abutment block 23 is made of insulating material. A support tension spring 24 is disposed in the receiving groove 211 of the support block 21 located above, one end of the support tension spring 24 is connected to the inner bottom wall of the receiving groove 211, and the other end is connected to one end of the abutment block 23 close to the inner bottom wall of the receiving groove 211. A first waist-shaped hole 212 is provided on the bottom surface of the support block 21 located above, and a second waist-shaped hole 213 is provided on the top surface of the support block 21 located below. The first waist-shaped hole 212 and the second waist-shaped hole 213 are both connected to the corresponding receiving groove 211. Before the linkage rod 25 is vertically connected to the two abutment blocks 23 in the same support assembly 2, the top end of the linkage rod 25 is slidably disposed in the first waist-shaped hole 212, and the bottom end of the linkage rod 25 is slidably disposed in the second waist-shaped hole 213. The top end of the abutment block 23 close to the inner bottom wall of the accommodating groove 211 is provided with an abutment slope.

[0039] Reference Figure 3-Figure 5 The adjusting assembly 5 includes a lifting ring 51, an adjusting frame 52, a sliding rod 54, a sliding block 55, a connecting spring 56, a fixing block 57, a mounting rod 58 and an extrusion block 59. The adjusting frame 52 is arranged on the top surface of the porous ceramic support base 3, and the lifting ring 51 is arranged above the heating assembly 1. A driving motor 7 is arranged on the adjusting frame 52, and the output shaft of the driving motor 7 extends downward and is vertically connected to a driving screw 8. A guide rod 9 is vertically penetrated and slidably connected to the adjusting frame 52, and the top end of the guide rod 9 is connected to a limiting block 10. The bottom end of the driving screw 8 is threadedly connected to the lifting ring 51, and the bottom end of the guide rod 9 is connected to the lifting ring 51.

[0040] Reference Figure 5, the lifting rod 53 is connected with a plurality of sliding rods 54 along the radial direction, the sliding rods 54 are square rods, and the plurality of sliding rods 54 correspond to the plurality of rows of support assemblies 2 in the vertical direction, and the sliding rods 54 are provided with scale lines 11 along the length direction thereof. A fixed block 57 is fixedly connected to each sliding rod 54, and a plurality of sliding blocks 55 are slidably provided on each sliding rod 54, and the sliding block 55 is provided on the side of the fixed block 57 close to the lifting ring 51. A mounting rod 58 is vertically connected to the bottom surface of each sliding block 55 and the fixed block 57, and an extrusion block 59 is connected to the bottom end of each mounting rod 58. An extrusion slope is provided on the side of the extrusion block 59 close to the central axis of the lifting ring 51, and the shape of the extrusion slope is provided corresponding to the shape of the abutment slope. A connecting spring 56 is connected between the fixed block 57 and the adjacent sliding block 55 on the same sliding rod 54, and between two adjacent sliding blocks 55. A communication port 214 is formed on the top surface of the support block 21 located above, and the communication port 214 is connected to the receiving groove 211. In a natural state, a plurality of extrusion blocks 59 are arranged in a one-to-one correspondence with the plurality of communication ports 214 in the vertical direction.

[0041] Reference Figure 6 A plurality of second limiting slots 33 are provided on the top surface of the porous ceramic support base 3, and the plurality of second limiting slots 33 are arranged one by one in the vertical direction corresponding to the plurality of rows of support assemblies 2. The bottom end of the second limiting slot 33 is connected to the first limiting slot 32, and the width of the second limiting slot 33 is smaller than the width of the first limiting slot 32. The bottom end of the support rod 22 is vertically connected to the limiting rod 26, and the bottom end of the limiting rod 26 is provided with a sliding roller 27, the limiting rod 26 is slidably arranged in the second limiting slot 33, and the sliding roller 27 is rollingly arranged in the first limiting slot 32.

[0042] Reference Figure 4 and Figure 7 , the electrode rod 102 is provided with a mounting groove 12 along the length direction, the top of the mounting groove 12 penetrates the top of the electrode rod 102, and the edge of the grid plate 101 is inserted into the mounting groove 12 corresponding to the electrode rod 102. The clamping assembly 6 includes a clamping spring 61, a sliding arc rod 62 and a pull block 63. The clamping spring 61 is arranged in the mounting groove 12, and one side of the clamping spring 61 is connected to the inner wall of the mounting groove 12. In a natural state, the clamping spring 61 presses the grid plate 101 against the inner wall of the mounting groove 12. One end of the sliding arc rod 62 is connected to the clamping spring 61, and the other end penetrates the motor rod and is slidably connected thereto, and the pull block 63 is connected to the end of the sliding arc rod 62.

[0043] Reference Figure 3-Figure 5, for grid plates 101 of different specifications, in order to reduce the short circuit caused by the close distance between the multi-layer grid plates 101, it is necessary to adjust the spacing between two adjacent layers of grid plates 101. At this time, the driving motor 7 drives the driving screw 8 to rotate, and the lifting ring 51 moves downward under the driving of the driving screw 8 and the guiding action of the guide rod 9. The extrusion block 59 is inserted into the corresponding support block 21 through the connecting port 214, and the extrusion inclined surface contacts and slides relatively with the abutment inclined surface of the abutment block 23, thereby driving the abutment block 23, and the abutment block 23 moves in a direction away from the inner bottom wall of the accommodating groove 211, thereby expanding the overall thickness of the support assembly 2. The grid plates 101 slide relatively between the support assemblies 2, thereby adjusting the spacing between the two adjacent layers of grid plates 101. The setting of the scale line 11 on the sliding rod 54 facilitates the operator to observe the spacing between the two adjacent layers of grid plates 101. The abutment block 23 located below moves synchronously under the driving action of the linkage rod 25 , thereby achieving stable support for the upper and lower sides of the grid plate 101 .

[0044] Reference Figure 6 and Figure 7 When adjusting the spacing, the sliding roller 27 moves in the first limiting sliding groove 32, realizing the limit of the moving stroke of the support rod 22. When connecting the mesh plate 101, the pull block 63 is pulled to separate one side of the clamping spring 61 from the inner wall of the installation groove 12, and the side of the mesh plate 101 is inserted into the installation groove 12, and the pull block 63 is released, and the clamping spring 61 is pressed against the mesh plate 101, realizing the quick connection of the mesh plate 101.

[0045] The implementation principle of a grid plate electric heater in Example 2 of the present application is as follows: for grid plates 101 of different specifications, in order to reduce the short circuit caused by the close distance between multiple layers of grid plates 101, it is necessary to adjust the spacing between two adjacent layers of grid plates 101. The lifting ring 51 moves downward. The extrusion slope contacts and slides relatively with the abutment slope of the abutment block 23, and the abutment block 23 moves in a direction away from the inner bottom wall of the accommodating groove 211, thereby expanding the overall thickness of the support assembly 2 and realizing the adjustment of the spacing between two adjacent layers of grid plates 101.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A grid plate electric heater, characterized in that: The invention comprises a heating component (1), a supporting component (2) and a porous ceramic supporting base (3), wherein the heating component (1) comprises a grid plate (101) and an electrode rod (102), wherein one electrode rod (102) is arranged on the sides of both ends of the grid plate (101) in the length direction, wherein the length of the electrode rod (102) is greater than the width of the grid plate (101), wherein the grid plate (101) is spirally wound and arranged on the porous ceramic supporting base (3), wherein the grid plate (101) is vertically arranged on the porous ceramic supporting base (3), and wherein the supporting component (2) comprises a supporting rod (22) and a supporting block (2 1), the support rod (22) and the support block (21) are made of insulating material, one support block (21) is provided on the same side of both ends of the support rod (22), the support rod (22) is provided between two adjacent layers of the grid plates (101), the support rod (22) is in contact with the outer grid plates (101), and the support block (21) is in contact with the inner grid plates (101), a plurality of groups of the support components (2) are provided between two adjacent layers of the grid plates (101), and a plurality of rows of the plurality of support components (2) are provided along the radial direction on the heating component (1) wound into a cylindrical shape.

2. A grid plate electric heater according to claim 1, characterized in that: An insert rod (4) is provided on the electrode rod (102) located in the middle of the heating assembly (1); the insert rod (4) is vertically arranged at the bottom end of the electrode rod (102); a plug hole (31) is provided on the top surface of the porous ceramic support base (3); and the insert rod (4) is inserted into the insert rod (4).

3. A grid plate electric heater according to claim 2, characterized in that: The grid plate (101) comprises a first density plate (1011) and a second density plate (1012), and a side edge of the first density plate (1011) on one side in the width direction is arranged in abutment with a side edge of the second density plate (1012) on one side in the width direction.

4. A grid plate electric heater according to claim 3, characterized in that: A receiving groove (211) is provided on a side of the support block (21) away from the support rod (22), an abutment block (23) is slidably provided in the receiving groove (211), a first elastic member is provided between the abutment block (23) and the inner bottom wall of the receiving groove (211), and an adjustment component (5) for driving the abutment block (23) to move in the receiving groove (211) is provided on the porous ceramic base.

5. A grid plate electric heater according to claim 4, characterized in that: The adjusting component (5) comprises a lifting ring (51), a sliding rod (54), a sliding block (55), a fixed block (57) and an extrusion block (59); the lifting ring (51) is horizontally arranged above the heating component (1); a plurality of sliding rods (54) are arranged on the lifting ring (51) along a radial direction; the plurality of sliding rods (54) correspond to a plurality of rows of supporting components (2) in a one-to-one manner in a vertical direction; one fixed block (57) is fixedly arranged on each sliding rod (54); a plurality of sliding blocks (55) are slidably arranged on each sliding rod (54); the plurality of sliding blocks (55) are arranged on a side of the fixed block (57) close to the lifting ring (51); and a space between the fixed block (57) and an adjacent sliding block (55), and between two adjacent sliding blocks (55). A second elastic member is provided between the sliding blocks (55), one extrusion block (59) is provided on the bottom surface of the fixed block (57) and several sliding blocks (55), an extrusion slope is provided on the side of the extrusion block (59) close to the central axis of the lifting ring (51), an abutment slope is provided on the top end of the abutment block (23) close to the inner bottom wall of the receiving groove (211), a connecting port (214) is provided on the top surface of the support block (21) located above, and the connecting port (214) is connected to the corresponding receiving groove (211), in a natural state, several extrusion blocks (59) are arranged corresponding to several connecting ports (214) in the vertical direction, and a driving member for driving the lifting ring (51) to move in the vertical direction is provided on the porous ceramic support base (3).

6. A grid plate electric heater according to claim 5, characterized in that: In the same group of the support components (2), a linkage rod (25) is vertically connected between the abutment block (23) located at the top and the abutment block (23) located at the bottom, a first waist-shaped hole (212) connected to the receiving groove (211) is opened on the bottom surface of the support block (21) located at the top, and a second waist-shaped hole (213) connected to the receiving groove (211) is opened on the top surface of the support block (21) located at the bottom, and the two ends of the linkage rod (25) are slidably arranged in the first waist-shaped hole (212) and the second waist-shaped hole (213) respectively.

7. The grid plate electric heater according to claim 5, characterized in that: A sliding roller (27) is rotatably arranged at the bottom end of the support rod (22); a plurality of first limiting sliding grooves (32) are provided on the top surface of the porous ceramic support base (3) along the length direction of the plurality of rows of the support components (2); the plurality of first limiting sliding grooves are arranged in a one-to-one correspondence with the plurality of rows of the support components (2); and the sliding roller (27) is slidably arranged in the corresponding first limiting sliding grooves (32).

8. The grid plate electric heater according to claim 3, characterized in that: The electrode rod (102) is provided with a clamping assembly (6), the clamping assembly (6) comprising a clamping spring (61) and a sliding arc rod (62); the electrode rod (102) is provided with a mounting groove (12) for accommodating the grid plate (101) along the length direction; the clamping spring (61) is arranged in the mounting groove (12); one side of the clamping spring (61) is connected to the inner edge of the mounting groove (12); the sliding arc rod (62) is connected to the clamping spring (61); the sliding arc rod (62) penetrates the electrode rod (102) and is slidably connected thereto; one end of the sliding arc rod (62) extends out of the electrode rod (102); in a natural state, the clamping spring (61) presses the grid plate (101) against the inner wall of the mounting groove (12).

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