A dry-type power transformer

Abstract

This invention relates to the field of dry-type transformer technology and discloses a dry-type power transformer, including a bottom support. A fixed support is fixedly mounted on the top of the bottom support, and a left high-voltage coil is fixedly mounted on the top of the fixed support. A medium-high voltage coil is located to the right of the left high-voltage coil, and a right high-voltage coil is located to the right of the medium-high voltage coil. High-voltage taps are installed on the outer walls of the left, medium, and right high-voltage coils. By adjusting the central adjustment mechanism, when the central adjustment mechanism is adjusted, it drives the left and right connecting rods. The left and right connecting rods then drive the left and right adjustment mechanisms to adjust synchronously with the central adjustment mechanism, greatly saving the time for gear adjustment. This solves the problem that existing dry-type power transformers require disassembly and installation of each gear for adjustment, resulting in a significant time consumption during the adjustment process.

Description

Technical Field

[0001] The invention relates to the technical field of dry-type transformers, in particular to a dry-type power transformer. Background Art

[0002] Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, CNC machinery and equipment and other places. Simply put, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil. The cooling methods are divided into natural air cooling and forced air cooling. When the transformer is naturally cooled, it can operate continuously for a long time at the rated capacity. When forced air cooling, the transformer output capacity can be increased by 50%. It is suitable for intermittent overload operation or emergency overload operation.

[0003] Existing dry-type power transformers need to adjust the gear when in use. When the voltage on the low-voltage side is too high, the gear needs to be adjusted up. When the voltage on the low-voltage side is too low, the gear needs to be adjusted down. However, when adjusting the gear, they need to be disassembled and installed one by one, which results in a problem that a lot of time is consumed in the adjustment process. Summary of the invention

[0004] The present invention provides a dry-type power transformer, which solves the problems raised by the above-mentioned background technology.

[0005] The present invention provides the following technical solution: a dry-type power transformer, comprising a bottom bracket, a fixing bracket fixedly mounted on the top of the bottom bracket, a left high-voltage coil fixedly mounted on the top of the fixing bracket, a medium-high voltage coil on the right side of the left high-voltage coil, a right high-voltage coil on the right side of the medium-high voltage coil, high-voltage taps mounted on the outer walls of the left high-voltage coil, the medium-high voltage coil and the right high-voltage coil, and a voltage regulating structure mounted on the outer edge of the fixing bracket;

[0006] The voltage regulating structure comprises a middle connecting bracket, a left connecting bracket is provided on the left side of the middle connecting bracket, a right connecting bracket is provided on the right side of the middle connecting bracket, the outer edges of the middle connecting bracket, the left connecting bracket and the right connecting bracket are all provided with mounting vertical grooves, and the inner walls of the middle connecting bracket, the left connecting bracket and the right connecting bracket are respectively provided with a left regulating mechanism, a middle regulating mechanism and a right regulating mechanism;

[0007] The middle adjustment mechanism comprises a high-voltage connecting piece, the inner wall of which is provided with a cross groove, the inner wall of which is fixedly provided with an insulating gasket, and the inner wall of which is provided with a cross block;

[0008] One end of the cross block is fixedly equipped with an anti-drop sheet, and the other end of the cross block is fixedly equipped with a threaded column, and the outer edge of the threaded column is threadedly connected with a fixing nut;

[0009] A connecting rod is fixedly mounted on one end of the threaded column away from the cross block, a limiting groove is arranged on the outer edge of the connecting rod, a clamping groove is arranged on the outer edge of the connecting rod, and a clamping spring is clamped on the inner wall of the clamping groove;

[0010] A support spring is movably sleeved on the outer edge of the connecting long rod, and the support spring is located between the fixing nut and the sliding block.

[0011] As a preferred technical solution of the present invention, the left adjustment mechanism and the middle adjustment mechanism are movably connected through a left connecting rod, and the middle adjustment mechanism and the right adjustment mechanism are movably connected through a right connecting rod, and the structures of the left adjustment mechanism, the middle adjustment mechanism and the right adjustment mechanism are the same.

[0012] As a preferred technical solution of the present invention, a slider is movably sleeved on the outer edge of the connecting long rod, the slider is slidably connected to the installation vertical groove, a rotating rod is sleeved on the inner wall of the limiting groove, and a left connecting rod and a right connecting rod are movably connected to the inner wall of the top of the rotating rod.

[0013] As a preferred technical solution of the present invention, an observation piece is fixedly sleeved on the outer wall of the rotating rod, an observation hole is opened on the outer edge of the observation piece, and the outer edges of the middle connecting bracket, the left connecting bracket and the right connecting bracket are all provided with gear numbers, the gear numbers correspond to the observation holes, and the observation piece corresponds to the high-voltage connecting piece.

[0014] As a preferred technical solution of the present invention, the outer wall of the slider away from the observation piece is fixedly equipped with a mounting bracket, the outer wall of the mounting bracket is fixedly equipped with an adjustment limit plate, and a right limit plate is provided on the right side of the adjustment limit plate.

[0015] As a preferred technical solution of the present invention, an extension rod is fixedly assembled on one end of the connecting long rod away from the rotating rod, a long groove is opened on the outer edge of the extension rod, a support ring is sleeved on the inner wall of the long groove, a turntable is sleeved on the inner wall of the long groove, and the turntable is fixed by a hexagonal nut.

[0016] The present invention has the following beneficial effects:

[0017] 1. The dry-type power transformer adjusts the middle adjustment mechanism. When the middle adjustment mechanism is adjusted, the middle adjustment mechanism drives the left connecting rod and the right connecting rod, and the left connecting rod and the right connecting rod drive the left adjustment mechanism and the right adjustment mechanism to be adjusted synchronously with the middle adjustment mechanism, which greatly saves the time for gear adjustment, thereby solving the problem that the existing dry-type power transformer needs to be disassembled, installed and adjusted one by one when adjusting the gear, which consumes a lot of time in the adjustment process.

[0018] 2. The dry-type power transformer has an observation piece designed so that the position of the observation piece corresponds to that of the high-voltage connecting piece. When adjusting the high-voltage connecting piece, the adjusted position of the high-voltage connecting piece can be known by observing the observation piece, and the gear position number can be observed through the observation hole. The user can know the gear position of the transformer, which is convenient for the user to observe the gear position and facilitates subsequent adjustment.

[0019] 3. The dry-type power transformer adjusts the limit plate and the right limit plate. When the device is adjusted, the rotating rod will contact the adjustment limit plate and the right limit plate, so that the high-voltage connecting piece corresponds to the hole on the high-voltage tap. The device does not need to continuously rotate the connecting long rod to adjust whether the high-voltage connecting piece is opposite to the high-voltage tap, which further improves the speed of gear adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the installation position structure of the adjustment mechanism of the present invention;

[0021] Figure 2 This is a schematic diagram of the transformer body structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the front three-dimensional structure of the present invention;

[0023] Figure 4 It is a schematic diagram of the back three-dimensional structure of the present invention;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the adjustment mechanism of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the left and right side adjustment mechanism of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the middle adjustment mechanism of the present invention;

[0027] Figure 8 This is a schematic diagram of the explosion structure of the middle regulating mechanism of the present invention;

[0028] Fig. 9 It is a schematic diagram of the cross-sectional structure of the middle adjustment mechanism of the present invention;

[0029] Fig.10 This is a schematic diagram of the connecting long rod structure of the present invention;

[0030] Fig.11 This is a schematic diagram of the structure of the insulating gasket of the present invention;

[0031] Fig.12 It is a schematic diagram of the structure of the limit plate and the slider of the present invention.

[0032] In the figure: 1. bottom bracket; 2. fixed bracket; 3. left high-voltage coil; 4. medium-high voltage coil; 5. right high-voltage coil; 6. high-voltage tap; 7. voltage regulating structure;

[0033] 701, middle connecting bracket; 702, left connecting bracket; 703, right connecting bracket; 704, vertical installation slot; 705, gear position number; 706, middle adjustment mechanism; 707, left adjustment mechanism; 708, right adjustment mechanism; 709, left connecting rod; 7010, right connecting rod; 7011, extension rod; 7012, long slot; 7013, support ring; 7014, turntable; 7015, hexagonal nut;

[0034] 7061, high voltage connecting piece; 7062, cross slot; 7063, insulating gasket; 7064, cross block; 7065, anti-dropping piece; 7066, threaded column; 7067, connecting long rod; 7068, fixing nut; 7069, supporting spring; 70610, slider; 70611, retaining ring; 70612, observation piece; 70613, observation hole; 70614, mounting bracket; 70615, adjustment limit plate; 70616, right limit plate; 70617, rotating rod;

[0035] 70671, limit slot; 70672, card slot. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figure 1-Figure 12 A dry-type power transformer comprises a bottom bracket 1, a fixed bracket 2 is fixedly mounted on the top of the bottom bracket 1, a left high-voltage coil 3 is fixedly mounted on the top of the fixed bracket 2, a medium-high voltage coil 4 is arranged on the right side of the left high-voltage coil 3, a right high-voltage coil 5 is arranged on the right side of the medium-high voltage coil 4, a high-voltage tap 6 is installed on the outer walls of the left high-voltage coil 3, the medium-high voltage coil 4 and the right high-voltage coil 5, and a voltage regulating structure 7 is installed on the outer edge of the fixed bracket 2;

[0038] The voltage regulating structure 7 includes a middle connecting bracket 701, a left connecting bracket 702 is provided on the left side of the middle connecting bracket 701, and a right connecting bracket 703 is provided on the right side of the middle connecting bracket 701. The middle connecting bracket 701, the left connecting bracket 702 and the right connecting bracket 703 play a supporting role. The left regulating mechanism 707, the middle regulating mechanism 706 and the right regulating mechanism 708 can be installed on the left connecting bracket 702, the middle connecting bracket 701 and the right connecting bracket 703 respectively. The outer edges of the connecting brackets 703 are provided with installation vertical grooves 704, which facilitate the up and down sliding of the left adjustment mechanism 707, the middle adjustment mechanism 706 and the right adjustment mechanism 708. The inner walls of the middle connecting bracket 701, the left connecting bracket 702 and the right connecting bracket 703 are respectively provided with the left adjustment mechanism 707, the middle adjustment mechanism 706 and the right adjustment mechanism 708. The middle adjustment mechanism 706 drives the left adjustment mechanism 707 and the right adjustment mechanism 708 to be adjusted synchronously, without the need for individual adjustment, which greatly saves the time for adjusting the voltage gear.

[0039] The middle adjustment mechanism 706 includes a high-voltage connection piece 7061, and a cross slot 7062 is provided on the inner wall of the high-voltage connection piece 7061. By using the cross slot 7062 in conjunction with the cross block 7064, when the connecting long rod 7067 rotates, the connecting long rod 7067 can drive the cross block 7064 to rotate, so that the high-voltage connection piece 7061 can be rotated and adjusted, thereby improving the rationality of the device. An insulating gasket 7063 is fixedly mounted on the inner wall of the cross slot 7062, and a cross block 7064 is provided on the inner wall of the insulating gasket 7063. By using the setting of the insulating gasket 7063, the insulating gasket 7063 can isolate the high-voltage connection piece 7061 from the cross block 7064, so that the cross block 7064 will not conduct electricity, thereby improving the rationality and safety of the device;

[0040] One end of the cross block 7064 is fixedly equipped with an anti-slip sheet 7065. Through the setting of the anti-slip sheet 7065, the anti-slip sheet 7065 can prevent the connecting long rod 7067 from being separated from the high-voltage connecting sheet 7061. The other end of the cross block 7064 is fixedly equipped with a threaded column 7066. The outer edge of the threaded column 7066 is threadedly connected with a fixing nut 7068. The fixing nut 7068 is screwed on the threaded column 7066, so that the fixing nut 7068 can fix and clamp the high-voltage connecting sheet 7061, so that the high-voltage connecting sheet 7061 can be stably connected to the cross block 7064, thereby improving the stability of the device.

[0041] The end of the threaded column 7066 away from the cross block 7064 is fixedly equipped with a connecting rod 7067. The outer edge of the connecting rod 7067 is provided with a limiting groove 70671. By setting the limiting groove 70671, the rotating rod 70617 is sleeved on the limiting groove 70671. When the connecting rod 7067 rotates, it can drive the rotating rod 70617 to rotate, so that the angle of the rotating rod 70617 can be changed, so that the left connecting rod 709 and the right connecting rod 7010 on the rotating rod 70617 can be To obtain changes, the left adjustment mechanism 707 and the right adjustment mechanism 708 can be adjusted synchronously with the middle adjustment mechanism 706, which improves the rationality of the device. A clamping groove 70672 is provided on the outer edge of the connecting long rod 7067, and a clamping spring 70611 is clamped on the inner wall of the clamping groove 70672. By setting the clamping spring 70611, the clamping spring 70611 can limit the rotating rod 70617, so that the rotating rod 70617 will not move on the connecting long rod 7067, thereby improving the stability of the device.

[0042] A support spring 7069 is movably sleeved on the outer edge of the connecting long rod 7067, and the support spring 7069 is located between the fixing nut 7068 and the slider 70610. The support spring 7069 supports the high-voltage connecting piece 7061. When the device is in a stationary state, the high-voltage connecting piece 7061 is supported by the elastic force of the support spring 7069, so that the high-voltage connecting piece 7061 can be stably plugged into the high-voltage tap 6, thereby improving the stability of the device.

[0043] In a preferred embodiment, the left-side adjusting mechanism 707 and the middle adjusting mechanism 706 are movably connected via a left connecting rod 709, and the middle adjusting mechanism 706 and the right-side adjusting mechanism 708 are movably connected via a right connecting rod 7010. The structures of the left-side adjusting mechanism 707, the middle adjusting mechanism 706 and the right-side adjusting mechanism 708 are the same. When the middle adjusting mechanism 706 is adjusted, the left-side adjusting mechanism 707 and the right-side adjusting mechanism 708 are driven to be adjusted synchronously with the middle adjusting mechanism 706 through the left connecting rod 709 and the right connecting rod 7010, so that the three high-voltage connecting plates 7061 can all be adjusted, saving the time for gear adjustment.

[0044] In a preferred embodiment, the outer edge of the connecting rod 7067 is movably sleeved with a slider 70610. Since the connecting rod 7067 and the slider 70610 are movably sleeved, the connecting rod 7067 can slide in the slider 70610, so that the connecting rod 7067 can separate the high-voltage connecting piece 7061 from the high-voltage tap 6. The slider 70610 is slidably connected to the installation vertical groove 704. The inner wall of the limiting groove 70671 is sleeved with a rotating rod 70617. The rotating rod 70617 is The inner wall at the top of 617 is movably connected with a left connecting rod 709 and a right connecting rod 7010. By setting the slider 70610, the slider 70610 can move up and down on the installation vertical groove 704, so that the slider 70610 can drive the connecting long rod 7067 and the high-voltage connecting piece 7061 to move up and down, so that the high-voltage connecting piece 7061 can jump over the level, so that the high-voltage connecting piece 7061 can be more flexibly plugged into the high-voltage tap 6, thereby improving the flexibility of the device.

[0045] In a preferred embodiment, an observation piece 70612 is fixedly sleeved on the outer wall of the rotating rod 70617, and an observation hole 70613 is opened on the outer edge of the observation piece 70612. The outer edges of the middle connecting bracket 701, the left connecting bracket 702 and the right connecting bracket 703 are all provided with gear numbers 705, and the gear numbers 705 correspond to the observation holes 70613. The observation piece 70612 corresponds to the high-voltage connecting piece 7061. By utilizing the setting of the observation piece 70612, when the high-voltage connecting piece 7061 is adjusted, the adjusted position of the high-voltage connecting piece 7061 can be known by observing the observation piece 70612, and the gear number 705 can be observed through the observation hole 70613, so that the user can know the gear position of the transformer, which is convenient for the user to observe and adjust.

[0046] In a preferred embodiment, the outer wall of the slider 70610 away from the observation piece 70612 is fixedly equipped with a mounting bracket 70614. By mounting the mounting bracket 70614 on the slider 70610, the mounting bracket 70614 can move with the slider 70610, so that the mounting bracket 70614 will not interfere with the left connecting rod 709 and the right connecting rod 7010. The outer wall of the mounting bracket 70614 is fixedly equipped with an adjustment limit plate 70615. The right side of the adjustment limit plate 70615 is provided with a right limit plate 70616. By setting the limit plate 70615, when the device is being adjusted, the rotating rod 70617 will contact the adjustment limit plate 70615, and the high-voltage connecting piece 7061 will correspond to the hole on the high-voltage tap 6, so that the device does not need to continuously rotate the connecting long rod 7067 to adjust whether the high-voltage connecting piece 7061 corresponds to the high-voltage tap 6. When it is necessary to adjust to the next gear, the rotating rod 70617 will contact the right limit plate 70616, and the high-voltage connecting piece 7061 will correspond to the high-voltage tap 6, further improving the adjustment speed.

[0047] In a preferred embodiment, an extension rod 7011 is fixedly mounted on one end of the connecting long rod 7067 away from the rotating rod 70617, a long groove 7012 is provided on the outer edge of the extension rod 7011, a support ring 7013 is sleeved on the inner wall of the long groove 7012, a turntable 7014 is sleeved on the inner wall of the long groove 7012, and the turntable 7014 is fixed by a hexagonal nut 7015. By pulling the turntable 7014, the connecting long rod 7067 and the high-voltage connecting piece 7061 can be driven to slide in the slider 70610. The connecting long rod 7067, the high-voltage connecting piece 7061 and the slider 70610 can also be driven to move up and down by moving the turntable 7014 up and down, thereby improving the rationality of the device.

[0048] Working principle: when in use, the voltage gear is at the middle value. Moving downward means lowering the voltage, and moving upward means increasing the voltage. When it is necessary to lower the voltage, the rotating dial 7014 is pulled. At this time, the rotating dial 7014 drives the extension rod 7011, the connecting long rod 7067 and the rotating rod 70617 to slide in the slider 70610. At this time, the high-voltage connecting piece 7061 is detached from the high-voltage tap 6. Then, the rotating dial 7014 is rotated to drive the extension rod 7011, the connecting long rod 7067, the rotating rod 70617 and the high-voltage connecting piece 7061 to rotate. Then, the rotating dial 7014 is moved downward to drive the extension rod 7011, the connecting long rod 7067, the rotating rod 70617, the slider 70610 and the high-voltage connecting piece 7061 to move downward. By observing the observation hole 70613 on the observation piece 70612 and the required gear number 705, Correspondingly, the force is then unloaded on the turntable 7014. At this time, the high-voltage connecting piece 7061 is bounced into the high-voltage tap 6 by the elastic force of the support spring 7069. When the rotating rod 70617 contacts the adjustment limit plate 70615, the angle of the high-voltage connecting piece 7061 is changed. At this time, the angle of the high-voltage connecting piece 7061 is at the required gear shift angle. When it is necessary to downshift again, the turntable 7014 is reversed. At this time, the high-voltage connecting piece 7061 contacts the right limit plate 70616, and the turntable 7014 is moved downward again. Then the turntable 7014 is unloaded, and the rotating rod 70617 rotates to drive the left connecting rod 709 and the right connecting rod 7010 to move to the left. At this time, the left connecting rod 709 and the right connecting rod 7010 respectively drive the left adjusting mechanism 707 and the right adjusting mechanism 708 to adjust, so that the left adjusting mechanism 707 and the right adjusting mechanism 708 are adjusted synchronously with the middle adjusting mechanism 706.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry-type power transformer, comprising a bottom bracket (1), characterized in that: A fixed bracket (2) is fixedly mounted on the top of the bottom bracket (1), a left high-voltage coil (3) is fixedly mounted on the top of the fixed bracket (2), a medium-high voltage coil (4) is arranged on the right side of the left high-voltage coil (3), a right high-voltage coil (5) is arranged on the right side of the medium-high voltage coil (4), high-voltage taps (6) are installed on the outer walls of the left high-voltage coil (3), the medium-high voltage coil (4) and the right high-voltage coil (5), and a voltage regulating structure (7) is installed on the outer edge of the fixed bracket (2); The voltage regulating structure (7) comprises a middle connecting bracket (701), a left connecting bracket (702) is provided on the left side of the middle connecting bracket (701), and a right connecting bracket (703) is provided on the right side of the middle connecting bracket (701), and the outer edges of the middle connecting bracket (701), the left connecting bracket (702) and the right connecting bracket (703) are all provided with mounting vertical grooves (704), and the inner walls of the middle connecting bracket (701), the left connecting bracket (702) and the right connecting bracket (703) are respectively provided with a left regulating mechanism (707), a middle regulating mechanism (706) and a right regulating mechanism (708); The middle adjustment mechanism (706) comprises a high-voltage connecting piece (7061), the inner wall of the high-voltage connecting piece (7061) is provided with a cross groove (7062), the inner wall of the cross groove (7062) is fixedly equipped with an insulating gasket (7063), and the inner wall of the insulating gasket (7063) is provided with a cross block (7064); One end of the cross block (7064) is fixedly equipped with an anti-drop sheet (7065), and the other end of the cross block (7064) is fixedly equipped with a threaded column (7066), and the outer edge of the threaded column (7066) is threadedly connected with a fixing nut (7068); The end of the threaded column (7066) away from the cross block (7064) is fixedly equipped with a connecting rod (7067), the outer edge of the connecting rod (7067) is provided with a limiting groove (70671), the outer edge of the connecting rod (7067) is provided with a clamping groove (70672), and the inner wall of the clamping groove (70672) is clamped with a clamping spring (70611); A support spring (7069) is movably sleeved on the outer edge of the connecting long rod (7067), and the support spring (7069) is located between the fixing nut (7068) and the sliding block (70610).

2. A dry-type power transformer according to claim 1, characterized in that: The left adjustment mechanism (707) and the middle adjustment mechanism (706) are movably connected via a left connecting rod (709), and the middle adjustment mechanism (706) and the right adjustment mechanism (708) are movably connected via a right connecting rod (7010). The structures of the left adjustment mechanism (707), the middle adjustment mechanism (706) and the right adjustment mechanism (708) are the same.

3. A dry-type power transformer according to claim 1, characterized in that: The outer edge of the connecting long rod (7067) is movably sleeved with a slider (70610), and the slider (70610) is slidably connected to the installation vertical groove (704). The inner wall of the limiting groove (70671) is sleeved with a rotating rod (70617), and the inner wall of the top of the rotating rod (70617) is movably connected with a left connecting rod (709) and a right connecting rod (7010).

4. A dry-type power transformer according to claim 3, characterized in that: An observation piece (70612) is fixedly sleeved on the outer wall of the rotating rod (70617), and an observation hole (70613) is opened on the outer edge of the observation piece (70612). The outer edges of the middle connecting bracket (701), the left connecting bracket (702) and the right connecting bracket (703) are all provided with gear numbers (705), and the gear numbers (705) correspond to the observation hole (70613), and the observation piece (70612) corresponds to the high-voltage connecting piece (7061).

5. A dry-type power transformer according to claim 3, characterized in that: The outer wall of the slider (70610) away from the rotating rod (70617) is fixedly equipped with a mounting bracket (70614), and the outer wall of the mounting bracket (70614) is fixedly equipped with an adjustment limit plate (70615), and the right side of the adjustment limit plate (70615) is provided with a right limit plate (70616).

6. A dry-type power transformer according to claim 1, characterized in that: An extension rod (7011) is fixedly mounted on one end of the connecting long rod (7067) away from the anti-slip sheet (7065); a long groove (7012) is provided on the outer edge of the extension rod (7011); a support ring (7013) is sleeved on the inner wall of the long groove (7012); a turntable (7014) is sleeved on the inner wall of the long groove (7012); and the turntable (7014) is fixed by a hexagonal nut (7015).

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