Adjustable foot and calf stretcher

Abstract

The application discloses a kind of adjustable foot and shank stretchers, belong to fitness equipment technical field.It includes rotating component, and damping device fixed plate is rotatably installed on support plate and is rotatably connected with support plate, first elastic member is installed on the damping device, gear is installed on the adjusting rod of damping device;Adjusting component includes transmission shaft rotatably installed on support plate, and two groups of fixed blocks, support rod is fixedly installed on transmission shaft, two groups of limit rods are slidably connected on support rod, limit rod slides on fixed block, pedal is fixedly installed on transmission shaft, third elastic member is installed on support plate, rod component is installed on limit rod.The user of the present application can set different stretching angles according to the difference in flexibility of left and right legs, unilateral injury rehabilitation needs or body imbalance posture, which can not only isolate the target muscle group, but also correct the uneven problem of two sides, break through the limitation of traditional symmetrical stretching equipment, and improve the accuracy of rehabilitation and training.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fitness equipment, more particularly to an adjustable foot and calf stretcher. BACKGROUND

[0002] Stretching training of the foot and calf is an important part of rehabilitation medicine and sports fitness, which can effectively improve the blood circulation of the lower limbs, enhance the flexibility of the joints, and relieve muscle tension, and is particularly suitable for sports injury rehabilitation, correction of lower limb muscle imbalance, and daily muscle relaxation. With the improvement of people's health consciousness, various foot and calf stretching devices have emerged, such as stretchers.

[0003] Most of the existing stretchers are static stretchers or stretchers with slight vibration, which cannot be targeted according to the differences in flexibility of the left and right legs and feet of the user, and have insufficient flexibility. Some devices integrate dampers to provide stretching resistance, but the damping adjustment mostly relies on manual knobs, which requires the user to bend over to operate, which is not friendly to special groups with limited waist mobility. Moreover, the bilateral damping adjustment is mostly linked control, which cannot be independently set according to the differentiated needs of the two feet, and the personalized training capability is insufficient, further limiting the application range of the device. In view of this, we propose an adjustable foot and calf stretcher. SUMMARY

[0004] The purpose of the present application is to provide an adjustable foot and calf stretcher to solve at least one of the above technical problems.

[0005] The present application provides an adjustable foot and calf stretcher, which comprises a rotating assembly mounted on a folding frame, a damper mounted on a support plate of the rotating assembly, a fixed plate mounted on the output end of the damper and rotatably connected with the support plate, a first elastic member mounted on the damper, and a gear mounted on the adjusting rod of the damper.

[0006] The adjusting assembly comprises a transmission shaft rotatably mounted on the support plate, and two groups of fixed blocks fixedly mounted on the support plate, a support rod fixedly mounted on the transmission shaft, two groups of limiting rods slidably connected to the support rod, the limiting rods sliding on the fixed blocks, a pedal fixedly mounted on the transmission shaft, a third elastic member mounted on the support plate for pushing the pedal, and a rod assembly mounted on the limiting rod.

[0007] The pedal rotates to control the swing of the support rod, the limiting rods drive the two groups of rod assemblies to move in opposite directions, the descending rod assembly drives the gear to rotate, and the adjusting rod rotates to adjust the damping size of the damper.

[0008] As a further description of the above technical solution, the rotation axis of the adjusting rod is collinear with the rotation axis of the damper.

[0009] As a further description of the above technical scheme, two fixed blocks are located on both sides of the transmission shaft, and two top rods are located on both sides of the gear.

[0010] As a further description of the above technical scheme, the rod assembly comprises a connecting rod rotationally connected with the limiting rod, a push rod slidingly connected with the connecting rod, a fourth elastic member mounted on the push rod, a top rod rotationally connected with the connecting rod, and a torsion spring mounted at the rotationally connected position of the top rod, and the connecting rod is connected with the fixed block through a tension spring.

[0011] As a further description of the above technical scheme, the fixed block is provided with a guide groove, an adjusting groove and an arc-shaped groove which are in communication with each other, the first end groove depth of the adjusting groove is greater than the second end groove depth of the arc-shaped groove, and the second end groove depth of the adjusting groove is not less than the first end groove depth of the arc-shaped groove.

[0012] The limiting rod slides in the guide groove, and the push rod slides in the guide groove, the adjusting groove and the arc-shaped groove.

[0013] As a further description of the above technical scheme, the rotating assembly comprises an electric cylinder rotationally connected with the folding frame, a support shaft rotationally mounted at the output end of the electric cylinder, two groups of support plates mounted on the support shaft, an adjusting block slidingly mounted on one support plate, the support plate without the adjusting block being rotationally connected with the folding frame, and the support plate with the adjusting block being rotationally connected with the folding frame through a lifting rod.

[0014] As a further description of the above technical scheme, a fixed column is mounted on the support plate, and a plurality of limiting grooves are formed in the fixed column.

[0015] A plurality of limiting balls are elastically arranged on the gear, the fixed column is coaxial with the gear, the limiting balls are clamped into the limiting grooves, and the limiting balls are used for limiting the gear.

[0016] As a further description of the above technical scheme, the lifting rod comprises a support pipe mounted on the folding frame, a knob rotationally connected with the support pipe, a threaded rod threadedly matched with the knob, and the threaded rod being rotationally connected with the adjusting block.

[0017] As a further description of the above technical scheme, a toe pressing plate is magnetically mounted on the fixed plate, and a baffle is mounted at one end of the fixed plate.

[0018] As a further description of the above technical scheme, the folding frame comprises a fixed seat, a telescopic rod mounted on the fixed seat, the telescopic rod being connected through a hinge, an extension end of the telescopic rod being provided with a hand-held frame, and an operation screen being clamped on the hand-held frame.

[0019] As described above, due to the adoption of the above technical scheme, the beneficial effects of the present application are:

[0020] 1. The present application is designed by the combination of damper and first elastic element, which provides controllable resistance through damper and smooth reset after compression through first elastic element; when the user actively presses the fixed plate, the damper resistance can exercise muscle control force; in the reset stage, the elastic element and the damper cooperate to avoid joint impact caused by rapid rebound, realize smooth reset of the fixed plate, and reduce the risk of sports injury.

[0021] 2. The present application drives two groups of support plates by electric cylinder to adjust the overall angle, cooperates with lifting rod to realize independent inclination adjustment of single group of support plates, switches through overall adjustment and independent adjustment, and sets different stretching angles according to the flexibility difference between left and right legs, unilateral injury rehabilitation needs or body imbalance posture, so as to isolate the target muscle group and correct the uneven force problem on both sides, break through the limitation of traditional symmetrical stretching equipment, and improve the accuracy of rehabilitation and training.

[0022] 3. The present application can control the rotation of the top rod pushing gear through the foot tip stepping pedal, and then adjust the damping size, without the need for manual operation, effectively reducing the difficulty of damping adjustment, improving the flexibility of adjustment, which is especially suitable for rehabilitation or the elderly with inconvenient waist movement, and the two groups of dampers can independently adjust the resistance to meet the differentiated training needs of both feet.

[0023] 4. The folding frame is designed to be folded through telescopic rod hinge, height adjustment of hand support frame and rotation of operation screen, realizes space minimization storage in non-use state, and solves the problem of limited space in family or rehabilitation institution. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The overall structure schematic diagram of the adjustable foot and calf stretcher disclosed by a preferred embodiment of the present application is disclosed.

[0025] Figure 2 The folding schematic diagram of the adjustable foot and calf stretcher disclosed by a preferred embodiment of the present application is disclosed.

[0026] Figure 3 The electric cylinder connection structure schematic diagram of the adjustable foot and calf stretcher disclosed by a preferred embodiment of the present application is disclosed.

[0027] Figure 4 The fixed column structure schematic diagram of the adjustable foot and calf stretcher disclosed by a preferred embodiment of the present application is disclosed.

[0028] Figure 5 The lifting rod connection structure schematic diagram of the adjustable foot and calf stretcher disclosed by a preferred embodiment of the present application is disclosed.

[0029] Figure 6 The pedal connection structure schematic diagram of the adjustable foot and calf stretcher disclosed by a preferred embodiment of the present application is disclosed.

[0030] Figure 7 Partial sectional view of adjustable foot and calf stretcher according to a preferred embodiment of the present application;

[0031] Figure 8 Schematic diagram of gear structure of adjustable foot and calf stretcher according to a preferred embodiment of the present application;

[0032] Figure 9 Schematic diagram of rod assembly distribution of adjustable foot and calf stretcher according to a preferred embodiment of the present application;

[0033] Figure 10 Schematic diagram of fixed block structure of adjustable foot and calf stretcher according to a preferred embodiment of the present application;

[0034] Figure 11 Schematic diagram of rod assembly structure of adjustable foot and calf stretcher according to a preferred embodiment of the present application;

[0035] Figure 12 Schematic diagram of top rod structure of adjustable foot and calf stretcher according to a preferred embodiment of the present application.

[0036] Figure legend: 1, folding frame; 11, fixed seat; 12, telescopic rod; 13, hand support frame; 14, operation screen; 2, rotating assembly; 21, electric cylinder; 22, support shaft; 23, support plate; 24, fixed column; 25, limiting groove; 26, adjusting block; 3, lifting rod; 31, support pipe; 32, knob; 33, threaded rod; 4, damper; 41, adjusting rod; 5, fixed plate; 51, toe pressing plate; 52, baffle; 6, first elastic member; 7, gear; 71, groove; 72, second elastic member; 73, limiting ball; 8, adjusting assembly; 81, transmission shaft; 82, fixed block; 83, support rod; 84, limiting rod; 85, guide groove; 86, adjusting groove; 87, arc-shaped groove; 88, pedal; 89, third elastic member; 9, rod assembly; 91, connecting rod; 92, push rod; 93, fourth elastic member; 94, top rod; 95, torsional spring; 96, positioning rod; 10, tension spring. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0038] REFERENCE Figures 1 to 12The embodiment discloses an adjustable foot and calf stretcher, which comprises a folding frame 1, the folding frame 1 comprises a fixed seat 11, a telescopic rod 12 is installed on the fixed seat 11, the two are connected through a 90-degree hinge, the telescopic rod 12 can be folded on the fixed seat 11, the stretcher can be folded on the fixed seat 11 in a non-use state, the space occupation is reduced, the extension end of the telescopic rod 12 is fixedly installed with a hand support frame 13, the telescopic rod 12 can be fixed through a locker after being telescoped, so that the height of the hand support frame 13 is adjusted, so as to adapt to people of different heights, improve the flexibility of the stretcher, and the operation screen 14 is clamped on the hand support frame 13, the operation screen 14 can rotate around the hand support frame 13, in use, the operation screen 14 can be rotated and unfolded, in non-use, the operation screen 14 can be folded, the space occupation and damage risk are reduced. The folding frame 1 is installed with a rotating assembly 2.

[0039] Referring to Figure 2 and Figure 3 , the rotating assembly 2 comprises an electric cylinder 21 rotationally connected with the fixed seat 11, the output end of the electric cylinder 21 is rotationally installed with a support shaft 22, two groups of support plates 23 are rotationally installed on the support shaft 22, a fixed column 24 is fixedly installed on the support plate 23, a plurality of limiting grooves 25 are formed on the fixed column 24 and are circumferentially arranged around the axis of the fixed column 24, an adjusting block 26 is slidingly installed on one support plate 23, the support plate 23 without the adjusting block 26 is rotationally connected with the fixed seat 11, and the support plate 23 with the adjusting block 26 is rotationally connected with the fixed seat 11 through a lifting rod 3.

[0040] The lifting rod 3 comprises a support pipe 31 fixedly installed on the fixed seat 11, a knob 32 is rotationally connected with the support pipe 31, a threaded rod 33 is threadedly matched with the knob 32, a guide rod (not shown in the figure) is fixedly installed on the fixed seat 11, the guide rod is inserted into the support pipe 31 and is slidingly connected with the threaded rod 33, is used for limiting the rotation of the threaded rod 33 and guiding the axial lifting of the threaded rod 33, and the threaded rod 33 is rotationally connected with the adjusting block 26. After the electric cylinder 21 drives the adjustment of the angles of the two groups of support plates 23, the corresponding support plate 23 can be driven to rotate around the support shaft 22 by rotating the knob 32, so that the two groups of support plates 23 are different in angle, the user can set different stretching angles according to the different flexibility of the left and right legs or feet, unilateral injury rehabilitation or correction of body imbalance posture can be realized, and the target muscle group can be better isolated or exercised.

[0041] Referring to Figure 1 , Figure 2 , Figures 6 to 8The damping device 4 is rotatably installed on the support plate 23, the output end of the damping device 4 is rotatably connected with the fixed plate 5, the first elastic member 6 is installed on the damping device 4, one end of the first elastic member 6 is fixed on the housing of the damping device 4, and the other end is fixed on the output end of the damping device 4, for assisting the compression reset of the damping device 4. The end of the fixed plate 5 away from the damping device 4 is rotatably connected with the support plate 23, the toe pressing plate 51 is magnetically installed on the fixed plate 5, for massaging the foot bottom acupoints of the user, promoting blood circulation, the rotating end of the fixed plate 5 is fixedly installed with the baffle 52, when the fixed plate 5 is inclined, the foot is placed on the toe pressing plate 51, the baffle 52 can support the heel, reducing the standing difficulty of the user.

[0042] The adjusting rod 41 of the damping device 4 is coaxial with the rotating axis of the damping device 4, the gear 7 is fixedly installed on the adjusting rod 41 of the damping device 4, the recess 71 is formed in the gear 7, the second elastic member 72 is installed in the recess 71, one end of the second elastic member 72 is fixedly connected with the gear 7, and the other end is fixedly connected with the limiting ball 73, the outer diameter of the limiting ball 73 is not greater than the diameter of the recess 71, the fixed column 24 is coaxial with the gear 7, and the fixed column 24 and the gear 7 can be rotatably connected or sleevedly connected. The limiting ball 73 is clamped into the limiting groove 25 under the action of the second elastic member 72, the rotating resistance of the gear 7 is increased, and the stability of the adjusting rod 41 is further enhanced. It should be noted that the adjusting rod 41 is the damping adjustment input end of the damping device 4, the output resistance of the damping device 4 can be changed by rotating the adjusting rod 41, and the damping device 4 and the adjusting rod 41 thereon are existing devices, and the structure and principle thereof will not be described in detail here.

[0043] Referring to Figures 6 to 10In order to further reduce the difficulty of adjusting the damping size of the damper 4 during use, an adjusting assembly 8 is installed on the support plate 23, the adjusting assembly 8 comprises a transmission shaft 81 rotatably installed on the support plate 23, and two groups of fixing blocks 82 fixedly installed on the support plate 23, the fixing blocks 82 are distributed on both sides of the transmission shaft 81, a support rod 83 is fixedly installed on the transmission shaft 81, two groups of limiting rods 84 are slidably connected to the support rod 83, the limiting rods 84 are perpendicular to the support rod 83, guide grooves 85, adjusting grooves 86 and arc-shaped grooves 87 are formed in the fixing blocks 82, the first end of the adjusting groove 86, the tail end of the arc-shaped groove 87 and the tail end of the guide groove 85 are communicated with each other, the groove depth of the first end of the adjusting groove 86 is greater than the groove depth of the tail end of the arc-shaped groove 87, the tail end of the adjusting groove 86 is communicated with the first end of the arc-shaped groove 87, and the groove depth of the tail end of the adjusting groove 86 is not less than the groove depth of the first end of the arc-shaped groove 87, the limiting rods 84 slide in the guide grooves 85, a pedal 88 is fixedly installed on the transmission shaft 81, the pedal 88 is located on one side of the support plate 23, and the pedal 88 is parallel to the support rod 83.

[0044] With reference to Figure 9 , Figure 11 and Figure 12 , a rod assembly 9 is installed on the limiting rod 84, the rod assembly 9 comprises a connecting rod 91 rotatably connected to the limiting rod 84, a push rod 92 slidably connected to the connecting rod 91, a fourth elastic member 93 installed on the connecting rod 91 and used for pushing the push rod 92 to move towards the fixing block 82, the push rod 92 slides in the guide grooves 85, the adjusting grooves 86 and the arc-shaped grooves 87, end portions of the connecting rod 91 are rotatably connected with top rods 94, the two top rods 94 are located on both sides of the gear 7, torsional springs 95 are installed on the rotatable connections of the top rods 94, one end of each torsional spring 95 is fixedly connected with the top rod 94, and the other end is fixedly connected with the connecting rod 91, a positioning rod 96 is fixedly installed on the connecting rod 91, the torsional springs 95 are used for driving the top rods 94 to rotate towards the positioning rod 96, the connecting rod 91 is connected with the fixing block 82 through the tension spring 10, and the elastic force of the third elastic member 89 is greater than that of the tension spring 10. By controlling different rotating directions of the transmission shaft 81, the top rods 94 are controlled to push the gear 7 and the adjusting rod 41 to rotate, so that the damping size of the damper 4 can be adjusted according to the needs of the user; the user can control the rotation of the transmission shaft 81 by the foot control pedal 88, so as to avoid frequent manual adjustment of the damping size, reduce the difficulty of damping adjustment, and especially be suitable for use by the convalescents who are inconvenient to bend down, and the damping sizes of the two fixed plates 5 corresponding to the damper 4 can be adjusted individually, so that different damping stretching training of two feet can be realized, and the flexibility of training is greatly improved.

[0045] Working principle: the telescopic rod 12 is unfolded to the vertical state, the length of the telescopic rod 12 is adjusted according to the height and locked by the locker, and the direction of the operation screen 14 is adjusted. The output end of the electric cylinder 21 is extended, and two groups of support plates 23 are pushed to rotate by the support shaft 22, the support plates 23 drive the fixed plates 5 to rotate synchronously through the dampers 4, so that the fixed plates 5 maintain a suitable angle with the horizontal plane, the user holds the handrails 13 with both hands, and steps on the toe pressing plates 51 of the two fixed plates 5 with the feet respectively and keeps close contact with the toe pressing plates 51, so as to realize the training or stretching of the ankle, lower limb joint, leg ligament and leg and foot muscles.

[0046] The user can press the fixed plate 5 with the forefoot and press the fixed plate 5, the output end of the damper 4 is compressed and contracted, and the first elastic member 6 is compressed. After the forefoot stops exerting force, the output end of the damper 4 is gradually reset under the action of the first elastic member 6, so that the fixed plate 5 is reset to the inclined state before pressing, and through repeated operation, active training of the feet and legs can be realized, and the training effect is improved.

[0047] When it is necessary to adjust the damping size of the damper 4, the tip of the foot steps on one end of the pedal 88, so that the pedal 88 rotates around the axis of the transmission shaft 81 and compresses the third elastic member 89. When the pedal 88 rotates, the transmission shaft 81 and the support rod 83 rotate, and when the support rod 83 rotates, one limit rod 84 drives the rod assembly 9 to move upwards, the rod assembly 9 that moves upwards does not contact the gear 7, the other limit rod 84 drives the connecting rod 91 to move downwards, so that the limit rod 84 slides downwards in the guide groove 85, the pull rod 92 slides downwards in the adjusting groove 86, the tension spring 10 is gradually stretched with the movement of the connecting rod 91, the top rod 94 contacts the gear 7 and drives the gear 7 to rotate, the gear 7 drives the adjusting rod 41 to rotate, so as to realize the damping size adjustment of the damper 4. When the gear 7 rotates, the limit ball 73 is pressed and moves into the recess 71 and compresses the second elastic member 72. With the continuous rotation of the gear 7, the limit ball 73 moves from one limit groove 25 to the next limit groove 25, so as to maintain the stability of the rotated gear 7 and the adjusting rod 41, and reduce the risk of resetting the adjusting rod 41. It should be noted that the top rod 94 drives the gear 7 to rotate once, and the limit ball 73 switches at least one limit groove 25.

[0048] With the movement of the lever 92 to the tail end of the adjusting groove 86, under the pulling force of the tension spring 10, the connecting rod 91 rotates around the limiting rod 84, so that the lever 92 moves from the adjusting groove 86 to the arc-shaped groove 87, the jacking rod 94 is separated from the gear 7, when the foot is separated from the pedal 88, under the action of the third elastic member 89, the pedal 88, the supporting rod 83 and the limiting rod 84 are reset, the lever 92 slides in the arc-shaped groove 87 and returns to the adjusting groove 86, and then enters the guide groove 85, so that the adjustment of the damping size is completed. When the reverse damping needs to be adjusted, the other end of the pedal 88 is rotated by the foot, so that the reverse damping adjustment is realized. It should be noted that initially, the lever 92 and the limiting rod 84 are both in the guide groove 85.

[0049] When the two feet of the user are stretched at different angles, the threaded rod 33 is controlled to rise by manually rotating the knob 32, the threaded rod 33 drives the corresponding supporting plate 23 to rotate around the supporting shaft 22, different angle inclinations of the two groups of supporting plates 23 are realized, the two feet of the user are respectively stepped on the different toe pressure plates 51, and the non-same angle training of the feet and legs is realized. It should be noted that when the user is static stretching, the damping of the damper 4 can be adjusted to the maximum, so that the stability of the foot support of the fixed plate 5 is ensured.

[0050] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An adjustable foot and calf stretcher, characterized by: The rotating assembly is installed on the folding frame, a damping device is rotatably installed on a support plate of the rotating assembly, a fixed plate rotatably installed on an output end of the damping device is rotatably connected with the support plate, a first elastic member is installed on the damping device, and a gear is installed on an adjusting rod of the damping device; The adjusting assembly comprises a transmission shaft rotatably installed on the support plate and two groups of fixed blocks fixedly installed on the support plate, a support rod is fixedly installed on the transmission shaft, two groups of limiting rods are slidably connected on the support rod, the limiting rods slide on the fixed blocks, a pedal is fixedly installed on the transmission shaft, a third elastic member for pushing the pedal is installed on the support plate, and a rod assembly is installed on the limiting rod; The rotating shaft of the adjusting rod is collinear with the rotating shaft of the damping device; The two fixed blocks are located on the two sides of the transmission shaft, and the two jacks are located on the two sides of the gear; The rod assembly comprises a connecting rod rotatably connected with the limiting rod, a push rod is slidably connected on the connecting rod, a fourth elastic member is installed on the push rod, a jack is rotatably connected on the connecting rod, and a torsion spring is installed on the rotating connection position of the jack. The fixed block is provided with a guide groove, an adjusting groove and an arc-shaped groove which are in communication with each other, the first end groove depth of the adjusting groove is greater than the second end groove depth of the arc-shaped groove, and the second end groove depth of the adjusting groove is not less than the first end groove depth of the arc-shaped groove. The limiting rod slides in the guide groove, and the push rod slides in the guide groove, the adjusting groove and the arc-shaped groove. The support plate is provided with a fixed column, and a plurality of limiting grooves are formed in the fixed column. A plurality of limiting balls are elastically arranged on the gear, the fixed column is coaxial with the gear, the limiting balls are clamped into the limiting grooves, and the limiting balls are used for limiting the gear. The pedal rotation controls the support rod swing, the limiting rod drives the two groups of rod assemblies to move reversely, the descending rod assembly drives the gear to rotate, the adjusting rod rotates to adjust the damping size of the damping device.

2. The adjustable foot and lower leg stretcher of claim 1, wherein: The rotating assembly comprises an electric cylinder rotatably connected with the folding frame, a support shaft is rotatably installed on an output end of the electric cylinder, two groups of support plates are installed on the support shaft, an adjusting block is slidably installed on one support plate, the support plate without the adjusting block is rotatably connected with the folding frame, and the support plate with the adjusting block is rotatably connected with the folding frame through a lifting rod.

3. The adjustable foot and lower leg stretcher of claim 2, wherein: The lifting rod comprises a support pipe installed on the folding frame, a knob is rotatably connected with the support pipe, a threaded rod is threadedly connected with the knob, and the threaded rod is rotatably connected with the adjusting block.

4. The adjustable foot and lower leg stretcher of any of claims 1-3, wherein: A toe plate is magnetically installed on the fixed plate, and a baffle is installed on one end of the fixed plate.

5. The adjustable foot and lower leg stretcher of any of claims 1-3, wherein: The folding frame comprises a fixed seat, an extension rod is installed on the fixed seat, the extension rod is connected through a hinge, an operation handle is installed on an extension end of the extension rod, and an operation screen is clamped on the operation handle.

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