Reaction device for preparing organic compound

Abstract

The invention relates to the technical field of reaction kettles, and particularly discloses a reaction device for preparing organic compounds, which comprises a reaction kettle, a stirring shaft coaxially arranged with the reaction kettle, a filter screen arranged at the bottom of the stirring shaft and attached to the inner wall of the reaction kettle, and a lifting part arranged at the bottom of the reaction kettle and used for driving the filter screen to lift, telescopic rods are uniformly distributed in the circumferential direction of the stirring shaft, mounting blocks are fixedly arranged at the bottoms of the telescopic rods, are spirally distributed on the periphery of the stirring shaft and are attached to the outer wall of the stirring shaft, fan-shaped catalyst nets are rotationally arranged on the mounting blocks, transmission parts I are mounted between the stirring shaft and the telescopic rods, and when the stirring shaft rotates, the telescopic rods synchronously rotate; a transmission part II is mounted between the movable end of the telescopic rod and the catalyst net; the catalyst net is spirally arranged on the periphery of the stirring shaft, so that reaction liquid can be in full contact with a catalyst during reaction, and the catalyst net rises after the reaction is completed so as to be cleaned.

Description

Technical Field

[0001] The invention relates to the technical field of reaction kettles, and in particular to a reaction device for preparing organic compounds. Background Art

[0002] Organic synthesis reactions are used in the pharmaceutical, pesticide, fine chemical and other industries. As a key reaction vessel, the organic reactor plays a vital role. In organic reactions, catalysts generally need to be added to the reaction materials. However, the catalysts in the prior art cannot be evenly mixed in the reaction liquid when added, resulting in uneven reaction of the reaction liquid.

[0003] A Chinese patent document with authorization announcement number CN117619281B discloses a reactor reaction device, comprising: a reactor, a riser assembly is arranged inside the reactor in a vertical direction, the upper end of the riser assembly is connected to a first feed port, the lower end of the riser assembly is located inside the discharge port, and a through hole is arranged on the circumferential side of the riser assembly; a stirring device is sleeved on the outside of the riser assembly, and the stirring device can rotate on the riser assembly; a reactor reaction device of the present invention, when the stirring device rotates around a second direction, the stirring device squeezes the liquid raw material at the bottom of the reactor, so that it flows to the inside of the riser, and then flows out through the through hole, the flowing liquid raw material has a stirring and impacting effect on the catalyst particles deposited at the bottom of the reactor, so that the catalyst can be fully contacted and mixed with the liquid raw material, thereby improving the working efficiency of the catalyst.

[0004] In the above technical scheme, the catalyst in the reactor is stirred by a stirring device, so that the liquid stirs and impacts the catalyst at the bottom of the reactor. However, when the catalyst is impacted by the liquid flow, it cannot be guaranteed that the catalyst can be fully catalyzed in the upper liquid. At the same time, the impact of the liquid flow on the catalyst cannot make the catalyst evenly distributed in the liquid in the vertical direction, which leads to uneven reaction of the liquid in the reaction device. At the same time, the above technical scheme needs to separate and clean the liquid and the catalyst after the catalytic reaction is completed so that they can be used again. Summary of the invention

[0005] The present invention provides a reaction device for preparing an organic compound, aiming to solve the problem in the related art that the catalyst cannot be evenly distributed in a feed liquid, thus causing an uneven reaction of the feed liquid.

[0006] A reaction device for preparing organic compounds, comprising: a reactor, a stirring shaft coaxially arranged with the reactor, a filter screen in contact with the inner wall of the reactor is arranged at the bottom of the stirring shaft, and a lifting member for driving the filter screen to rise and fall is arranged at the bottom of the reactor; The telescopic rods are evenly distributed along the circumference of the stirring shaft, and a mounting block is fixedly arranged at the bottom of the telescopic rods. The mounting block is spirally distributed on the outer circumference of the stirring shaft and fits with the outer wall of the stirring shaft. A fan-shaped catalyst net is rotatably arranged on the mounting block. A transmission member 1 is installed between the stirring shaft and the telescopic rods. When the stirring shaft rotates, all the telescopic rods rotate synchronously. A transmission member 2 is installed between the movable end of the telescopic rod and the catalyst net, so that when the telescopic rod rotates, the catalyst net rotates along the radial direction of the stirring shaft; A downward-opening cylindrical structure is arranged on the top of the reactor, and a water injection hole is arranged in the cylindrical structure. When the catalyst net rotates to a horizontal state, the filter net moves upward and makes the catalyst nets form a circular structure that fits each other. When the circular structure rises, the water in the cylindrical structure flows downward from the circular structure and flushes the catalyst in the circular structure.

[0007] The effect is that the catalyst nets are arranged in a spiral shape around the stirring shaft so that the reaction liquid can fully contact with the catalyst during the reaction. After the reaction is completed, all the catalyst nets are rotated to a horizontal state and in the same plane through the lifting parts. After the catalyst nets enter the cylindrical structure, water is injected into the reactor through the water injection hole. When the water flows downward from the catalyst net, the catalyst is cleaned.

[0008] Preferably, a swinging member is further provided between the catalyst net and the mounting block, the swinging member comprising a fixed rod and a swinging rod, the swinging rod and the fixed rod are hinged, a closed-loop slide groove is provided on the outer periphery of the fixed rod, a sliding block slidably arranged in the closed-loop slide groove is fixedly provided on the mounting block, and a torsion spring is provided between the swinging rod and the fixed rod; by providing the swinging member, different catalysts in the catalyst net can all be in contact with the reaction liquid, and after the reaction is completed, the swinging member can clean up the impurities attached to the catalyst.

[0009] Preferably, a stirring motor is provided on the top of the stirring shaft, and the stirring shaft is driven to rotate by the rotation of the stirring motor. The transmission member 1 includes a ring gear and a plurality of gears. The ring gear is fixedly arranged on the stirring shaft, and a gear is fixedly arranged on the top of each telescopic rod. All the gears are meshed with the ring gear. A fixing ring is fixedly arranged on the stirring motor, and the gears are rotatably arranged on the fixing ring. By arranging the transmission member 1, the power of the stirring shaft is transmitted to each telescopic rod, so that the telescopic rod rotates along its own axis.

[0010] Preferably, the transmission member 2 includes bevel gear 1 and bevel gear 2, the bevel gear 1 is fixedly arranged at the bottom of the telescopic rod, a mounting shaft extending in the radial direction of the stirring shaft is fixedly arranged on the catalyst net, the mounting shaft is rotatably arranged on the mounting block, the bevel gear 2 is fixedly arranged on the mounting shaft, and the bevel gear 1 and the bevel gear 2 are meshed with each other; by setting the transmission member 2, the power of the rotation of the telescopic rod is transmitted to the mounting shaft, so that the catalyst net rotates along the axis of the mounting shaft.

[0011] Preferably, the telescopic rod includes a fixed part and a movable part, an elastic member is installed between the fixed part and the movable part, and the movable part is slidably arranged in the fixed part; by arranging the telescopic rod, the catalyst mesh can be distributed in a spiral shape and can be in the same horizontal plane.

[0012] Preferably, a impeller is provided on the top of the filter screen, and when the stirring shaft rotates, the impeller is driven to rotate and thus the liquid in the reaction kettle is stirred; the reaction liquid is stirred by providing the impeller.

[0013] Preferably, the diameter of the cylindrical structure matches the diameter of the circular structure formed by the catalyst net, and the diameter of the filter net is larger than the diameter of the circular structure formed by the catalyst net; so that impurities cleaned from the catalyst net fall onto the filter net.

[0014] Preferably, the lifting member is an electric telescopic rod installed at the bottom of the reactor, and the filter screen is connected to the movable end of the electric telescopic rod; the lifting member drives the filter screen to be lifted and lowered, thereby driving the catalyst screen to be lifted and lowered.

[0015] By adopting the above technical solution, the beneficial effects of the present invention are: 1. When the reaction is in progress, the stirring shaft rotates, and the power on the stirring shaft is transmitted to the telescopic rod through the transmission member 1, and the power of the telescopic rod is transmitted to the catalyst net through the transmission member 2. When the stirring shaft rotates, the catalyst net is driven to rotate. Multiple catalyst nets are spirally distributed on the periphery of the stirring shaft, so that the feed liquid in the vertical direction can react with the catalyst. The catalyst net rotates along the radial direction of the stirring shaft to turn the reaction liquid up and down, and the reaction between the feed liquid and the catalyst in the reactor is more sufficient; 2. The catalyst in the catalyst net is stirred by setting a swinging piece, so that the catalyst in the catalyst net can react with the feed liquid, making the reaction more complete and efficient; 3. After the catalyst reaction is completed, the catalyst net is kept in a horizontal state by rotating the stirring shaft. When the lifting member drives all the catalyst nets to the same horizontal plane, water is injected between the cylindrical structure and the catalyst net through the water injection hole to flush the catalyst net. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the external structure of the present invention.

[0017] Figure 2 It is a schematic structural diagram of the stirring shaft, telescopic rod and filter screen of the present invention.

[0018] Figure 3 It is a schematic diagram of the top view of the structure when the catalyst net of the present invention is in a horizontal state.

[0019] Figure 4It is a schematic structural diagram of the rotating member 1 of the present invention.

[0020] Figure 5 It is a schematic structural diagram of the transmission member 2 and the swing member of the present invention.

[0021] Figure 6 It is a schematic structural diagram of the cylindrical structure and the water injection hole of the present invention.

[0022] Figure 7 It is a structural schematic diagram of the telescopic rod of the present invention.

[0023] Reference numerals: 1. Reactor; 2. Stirring shaft; 21. Mounting block; 22. Catalyst net; 23. Stirring motor; 3. Filter net; 31. Impeller; 4. Telescopic rod; 41. Transmission part 1; 411. Ring gear; 412. Gear; 413. Fixed ring; 42. Transmission part 2; 421. Bevel gear 1; 422. Bevel gear 2; 423. Mounting shaft; 43. Fixed part; 44. Movable part; 45. Elastic part; 5. Water injection hole; 6. Cylindrical structure; 7. Swinging part; 71. Fixed rod; 72. Swinging rod; 73. Closed-loop slide; 74. Sliding block; 75. Torsion spring; 8. Lifting part. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] like Figure 1-Figure 7 As shown, a reaction device for preparing organic compounds includes a reaction kettle 1, a stirring shaft 2, a plurality of telescopic rods 4, a transmission part and a catalyst net 22.

[0026] During the reaction, the catalyst is filled in the catalyst mesh 22, which is arranged in a spiral shape around the stirring shaft 2. The power is transmitted to the catalyst mesh 22 through the transmission member by the rotation of the stirring shaft 2, and the catalyst mesh 22 is rotated. When the catalyst mesh 22 rotates, the reaction liquid is stirred and the catalyst is fully in contact with the feed liquid.

[0027] In a preferred embodiment of the present invention, a stirring motor 23 is provided on the top of the stirring shaft 2, and the stirring shaft 2 is driven to rotate by the rotation of the stirring motor 23. The transmission member includes a transmission member 41 and a transmission member 42. The transmission member 41 includes a ring gear 411 and a plurality of gears 412. The ring gear 411 is fixedly arranged on the stirring shaft 2, and a gear 412 is fixedly arranged on the top of each telescopic rod 4, and all the gears 412 are meshed with the ring gear 411. A fixing ring 413 is fixedly arranged on the stirring motor 23, and the gears 412 are all rotatably arranged on the fixing ring 413, and the fixing ring 413 is fixedly arranged on the inner wall of the reactor 1; the stirring shaft 2 is driven to rotate by the rotation of the stirring motor 23, and then the ring gear 411 is driven to rotate, and the rotation of the ring gear 411 drives the gear 412 to rotate, and then the telescopic rod 4 rotates along its own axis.

[0028] In other embodiments of the present invention, the transmission member 41 includes a driving sprocket fixedly arranged on the stirring shaft 2, and each telescopic rod 4 is fixedly provided with a driven sprocket, and a transmission chain (not shown in the figure) is connected between the driving sprocket and the driven sprocket; the driving sprocket rotates to transmit power to the driven sprocket through the transmission chain, thereby driving the telescopic rod 4 to rotate along its own axis.

[0029] In a preferred embodiment of the present invention, the transmission member 42 includes a bevel gear 1 421 and a bevel gear 2 422, the bevel gear 1 421 is fixedly arranged at the bottom of the telescopic rod 4, a mounting shaft 423 extending in the radial direction of the stirring shaft 2 is fixedly arranged on the catalyst net 22, the mounting shaft 423 is rotatably arranged on the mounting block 21, the bevel gear 2 422 is fixedly arranged on the mounting shaft 423, and the bevel gear 1 421 and the bevel gear 2 422 are meshed with each other; when the telescopic rod 4 rotates, the bevel gear 1 421 is driven to rotate and the bevel gear 2 422 is driven to rotate, thereby rotating the catalyst net 22, and the catalyst net 22 rotates along the mounting shaft 423 to stir the feed liquid in the reactor 1, so that the feed liquid is fully in contact with the catalyst, and at the same time, the rotation of the catalyst net 22 can prevent the catalyst in the catalyst net 22 from being caking, resulting in only the outer layer of the catalyst being in contact with the feed liquid, the mounting block 21 abuts against the outer periphery of the stirring shaft 2, and when the telescopic rod 4 rotates, the mounting block 21 abuts against the stirring shaft 2 to prevent the mounting block 21 from rotating with the telescopic rod 4.

[0030] In other embodiments of the present invention, the transmission member 2 42 is a universal coupling (not shown in the figure), one end of the universal coupling is connected to the movable end of the telescopic rod 4, and the other end is connected to the installation shaft 423; when the telescopic rod 4 rotates, the power is transmitted to the installation shaft 423 through the universal coupling, thereby driving the catalyst mesh 22 to rotate.

[0031] The telescopic rod 4 includes a fixed portion 43 and a movable portion 44 , an elastic member 45 is installed between the fixed portion 43 and the movable portion 44 , and the movable portion 44 is slidably arranged in the fixed portion 43 ; when the telescopic rod 4 rises, the movable portion 44 rises and the elastic member 45 is compressed.

[0032] Specifically, the elastic member 45 is a spring, one end of which is connected to the fixed portion 43, and the other end of which is connected to the movable portion 44. The cross-section of the movable portion 44 is a triangular or quadrilateral non-circular rod-shaped structure, and a sliding groove that cooperates with the movable portion 44 is provided in the fixed portion 43; when the gear 412 drives the fixed portion 43 to rotate, the movable portion 44 rotates following the fixed portion 43.

[0033] In a preferred embodiment of the present invention, a swinging member 7 is further provided in the catalyst net 22 for moving the catalyst in the catalyst net 22, thereby preventing the catalyst in the catalyst net 22 from being agglomerated, and allowing the catalyst in the catalyst net 22 to contact the reaction liquid.

[0034] The swing member 7 includes a fixed rod 71 and a swing rod 72, wherein the swing rod 72 is hinged to the fixed rod 71, one end of the fixed rod 71 passes through the mounting shaft 423 to the mounting block 21, a closed-loop slide groove 73 is provided on the outer periphery of the fixed rod 71, a slider 74 slidably arranged in the closed-loop slide groove 73 is fixedly arranged on the mounting block 21, and a torsion spring 75 is arranged between the swing rod 72 and the swing rod 72; when the catalyst net 22 rotates, the mounting shaft 423 drives the fixed rod 71 to rotate synchronously, and when the fixed rod 71 rotates, the slider 74 moves in the closed-loop slide groove 73. The swing rod 72 slides in the slide groove 73, thereby moving the fixed rod 71 to the left and right directions. When the swing rod 72 contacts the installation shaft 423, the swing rod 72 changes from an inclined state to a horizontal state. When the swing rod 72 loses contact with the installation shaft 423, the swing rod 72 changes from a horizontal state to an inclined state under the action of the torsion spring 75. When the swing rod 72 changes between the horizontal state and the inclined state, the catalyst in the catalyst net 22 is moved to avoid catalyst agglomeration. At the same time, the catalyst in the catalyst net 22 is turned over so that the catalyst can all contact with the slurry.

[0035] Specifically, a cylindrical structure 6 with an opening facing downward is provided on the upper part of the reactor 1, and a water injection hole 5 is provided in the cylindrical structure 6; when the reaction is completed, the stirring shaft 2 rotates and makes all the catalyst nets 22 rotate to a horizontal state, and a filter net 3 is provided at the bottom of the stirring shaft 2, and the filter net 3 is pushed up by the lifting member 8, and the filter net 3 takes out impurities from the finished reaction liquid product. At this time, the finished product after the reaction can be taken out, and when the filter net 3 continues to rise, it pushes all the catalyst nets 22 to rise and be on the same horizontal plane, and the catalyst net 22 forms a circular structure. At this time, a water storage space is formed between the cylindrical structure 6 and the circular structure, and water is injected into the space through the water injection hole 5. The water injection speed will be greater than the water leakage speed of the circular structure. When the water storage space is full, the water flows out from the circular structure and cleans the impurities in the catalyst net 22. At this time, the lifting member 8 can rise and fall reciprocatingly. When the lifting member 8 rises, the water pressure in the water storage space rises and increases the flushing force on the catalyst net 22.

[0036] When cleaning the catalyst net 22, the lifting member 8 can be lifted and lowered multiple times, so that when the stirring shaft 2 rotates, the swing member 7 stirs the catalyst in the catalyst net 22 to make the impurities attached to the catalyst fall off, thereby making the water flow clean the catalyst more thoroughly.

[0037] A impeller 31 is arranged on the top of the filter screen 3. When the stirring shaft 2 rotates, the impeller 31 is driven to rotate, thereby stirring the feed liquid in the reactor 1, so that the feed liquid rotates under the drive of the impeller 31, and at the same time, the feed liquid is turned over under the stirring of the catalyst screen 22, so that the feed liquid and the catalyst in the catalyst screen 22 are more fully in contact.

[0038] Specifically, the diameter of the cylindrical structure 6 is compatible with the diameter of the circular structure formed by the catalyst mesh 22, and the diameter of the filter mesh 3 is larger than the diameter of the circular structure formed by the catalyst mesh 22. When the lifting member 8 rises, the filter mesh 3 enters the cylindrical structure 6, and the filter mesh 3 is below the cylindrical structure 6. When the lifting member 8 descends, the impurities flushed from the catalyst mesh 22 fall on the filter mesh 3, and the filter mesh 3 can be disassembled and cleaned subsequently.

[0039] The lifting member 8 is an electric telescopic rod installed at the bottom of the reactor 1, and the filter screen 3 is connected to the movable end of the electric telescopic rod; the filter screen 3 is lifted and lowered by the extension and retraction of the electric telescopic rod.

[0040] Working principle: When the reaction is carried out, the stirring shaft 2 rotates, and the power of the stirring shaft 2 is transmitted to the telescopic rod 4 through the transmission member 1 41, and the power of the telescopic rod 4 is transmitted to the catalyst net 22 through the transmission member 2 42. When the stirring shaft 2 rotates, the catalyst net 22 is driven to rotate. A plurality of catalyst nets 22 are spirally distributed on the periphery of the stirring shaft 2, so that the feed in the vertical direction can react with the catalyst. The catalyst net 22 rotates along the radial direction of the stirring shaft 2 to turn the reaction liquid up and down, and the reaction between the feed and the catalyst in the reactor 1 is more sufficient; by setting the swing member 7, the catalyst in the catalyst net 22 is The agent is stirred so that the catalyst in the catalyst net 22 can react with the feed liquid, making the reaction more sufficient and efficient; when the catalytic reaction is completed, the catalyst net 22 is in a horizontal state by rotating the stirring shaft 2. When the lifting member 8 drives all the catalyst nets 22 to be on the same horizontal plane, water is injected into the space between the cylindrical structure 6 and the catalyst net 22 through the water injection hole 5 to flush the catalyst net 22. When the lifting member 8 rises, the water between the cylindrical structure 6 and the catalyst net 22 is squeezed out, thereby increasing the cleaning force of the water flow on the catalyst net 22, flushing away the attachments on the surface of the catalyst, and ensuring the catalytic reaction rate next time. Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A reaction device for preparing an organic compound, comprising a reaction kettle (1), characterized in that: Also includes: A stirring shaft (2) is coaxially arranged with the reaction kettle (1), a filter screen (3) is arranged at the bottom of the stirring shaft (2) and is in contact with the inner wall of the reaction kettle (1), and a lifting member (8) is arranged at the bottom of the reaction kettle (1) for driving the filter screen (3) to move up and down; Telescopic rods (4) are evenly distributed along the circumference of the stirring shaft (2); a mounting block (21) is fixedly arranged at the bottom of the telescopic rods (4); the mounting block (21) is spirally distributed on the outer circumference of the stirring shaft (2) and fits the outer wall of the stirring shaft (2); a fan-shaped catalyst net (22) is rotatably arranged on the mounting block (21); a transmission member (41) is installed between the stirring shaft (2) and the telescopic rods (4); when the stirring shaft (2) rotates, all the telescopic rods (4) rotate synchronously; a transmission member (42) is installed between the movable end of the telescopic rod (4) and the catalyst net (22), so that when the telescopic rod (4) rotates, the catalyst net (22) rotates along the radial direction of the stirring shaft (2); A cylindrical structure (6) with an opening facing downward is arranged at the top of the reaction kettle (1), and a water injection hole (5) is arranged in the cylindrical structure (6). When the catalyst net (22) rotates to a horizontal state, the filter net (3) moves upward and makes the catalyst net (22) present a circular structure that fits each other. When the circular structure rises, water in the cylindrical structure (6) flows downward from the circular structure and washes the catalyst in the circular structure.

2. The reaction device for preparing an organic compound according to claim 1, characterized in that: A swing member (7) is also provided between the catalyst net (22) and the mounting block (21), the swing member (7) comprising a fixed rod (71) and a swing rod (72), the swing rod (72) being hinged to the fixed rod (71), a closed-loop slide groove (73) being provided on the outer periphery of the fixed rod (71), a slider (74) being fixedly provided on the mounting block (21) and slidably provided in the closed-loop slide groove (73), and a torsion spring (75) being provided between the swing rod (72) and the fixed rod (71).

3. The reaction device for preparing an organic compound according to claim 1, characterized in that: A stirring motor (23) is provided at the top of the stirring shaft (2), and the stirring shaft (2) is driven to rotate by the rotation of the stirring motor (23). The transmission member (41) comprises a gear ring (411) and a plurality of gears (412). The gear ring (411) is fixedly arranged on the stirring shaft (2). A gear (412) is fixedly arranged on the top of each telescopic rod (4), and all the gears (412) are meshed with the gear ring (411). A fixing ring (413) is fixedly arranged on the stirring motor (23), and the gears (412) are rotatably arranged on the fixing ring (413).

4. The reaction device for preparing an organic compound according to claim 1, characterized in that: The transmission member 2 (42) comprises a bevel gear 1 (421) and a bevel gear 2 (422); the bevel gear 1 (421) is fixedly arranged at the bottom of the telescopic rod (4); a mounting shaft (423) extending in the radial direction of the stirring shaft (2) is fixedly arranged on the catalyst net (22); the mounting shaft (423) is rotatably arranged on the mounting block (21); the bevel gear 2 (422) is fixedly arranged on the mounting shaft (423); and the bevel gear 1 (421) and the bevel gear 2 (422) are meshed with each other.

5. The reaction device for preparing an organic compound according to any one of claims 1 to 4, characterized in that: The telescopic rod (4) comprises a fixed portion (43) and a movable portion (44), an elastic member (45) is installed between the fixed portion (43) and the movable portion (44), and the movable portion (44) is slidably arranged in the fixed portion (43) up and down.

6. The reaction device for preparing an organic compound according to claim 1, characterized in that: A pulsator (31) is arranged on the top of the filter screen (3); when the stirring shaft (2) rotates, the pulsator (31) is driven to rotate, thereby stirring the liquid in the reaction kettle (1).

7. The reaction device for preparing an organic compound according to claim 1, characterized in that: The diameter of the cylindrical structure (6) matches the diameter of the circular structure formed by the catalyst net (22), and the diameter of the filter net (3) is greater than the diameter of the circular structure formed by the catalyst net (22).

8. The reaction device for preparing an organic compound according to claim 1, characterized in that: The lifting member (8) is an electric telescopic rod installed at the bottom of the reaction kettle (1), and the filter screen (3) is connected to the movable end of the electric telescopic rod.

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