A device for assisting in the performance of a dancer's leg stretch and straddle

Abstract

The application relates to the technical field of dance training tools, in particular to a leg pressing and striding auxiliary device for dance training, which comprises a T-shaped bottom plate, a middle partition plate, an adjusting plate, an angle adjusting device, a driving device, a supporting device, a sliding adjusting device and a pressing device. Sliding grooves in T shapes are arranged on the horizontal supporting plates of the T-shaped bottom plate; the outer walls of the adjusting plate are fixedly provided with the angle adjusting devices; the inner walls of the adjusting plate are provided with the driving devices; the sliding adjusting devices are symmetrically screwed and fixed on the two ends of the guide screws; and the pressing device is arranged on the supporting plate under the pressing groove. The structure design is reasonable, the device can be used for striding training while lying on the T-shaped bottom plate, the device can be used without the assistance of others, the left side crank can be rotated to make the supporting block support the legs in the frog shape, the right side crank can be rotated to adjust the pressing plate to press the knees, the pressing force and the pressing distance can be adjusted according to the personal needs, the training effect is improved, the device is simple and convenient to use, and is safe and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of dance training tools, in particular to a leg-pressing and stepping auxiliary device for dance training. Background Art

[0002] Dance is a performing art form that uses the body to perform various graceful or difficult movements, usually accompanied by music, and uses rhythmic movements as its primary means of expression. Hip-stepping is a fundamental skill in dance practice and the basis for achieving synchronized ankle and hip twisting. During hip-stepping, one person lies on the ground with their legs bent like a frog, while another person stands on their knees to pull the hips apart. During hip-stepping, someone needs to assist by stepping on the knees of the person to continuously stretch the hips apart. Due to the different weights of the people stepping on the hips, the downward pressure cannot be well controlled. Excessive pressure applied too quickly can easily cause ligament injuries to the person. Furthermore, someone must continuously step on the knees during training, which is very troublesome and prevents self-training.

[0003] In summary, in order to solve the above-mentioned technical problems, this technical solution provides a leg-pressing and hip-stepping auxiliary device for dance training. The user can lie on a T-shaped base to perform hip-pressing exercises independently without the need for assistance. The left crank can be turned to move the support blocks on both sides closer or further apart, causing the support blocks to spread the legs out in a frog-like shape. The right crank can be turned to adjust the lower pressure plate to press down on the knees. The downward pressure strength and distance can be adjusted according to individual needs to improve training results. The device can be operated manually by the user, making it simple, convenient, safe, and reliable to use. Summary of the Invention

[0004] The purpose of the present invention is to provide a leg-stretching and crotch-stepping auxiliary device for dance training in order to overcome the above-mentioned technical shortcomings. The present invention has a reasonable structural design, and can be used to perform crotch-stepping exercises while lying on a T-shaped base. It can be operated independently without the need for assistance from others. The left crank can be rotated to move the support blocks on both sides closer or farther away, so that the support blocks spread the legs out in a frog-like shape. The right crank can be rotated to adjust the lower pressure plate to press down the knees. The downward pressure strength and distance can be adjusted according to personal needs to improve the training effect. The present invention can be operated manually by individuals for training, and is simple, convenient, safe and reliable to use.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a leg-stretching and step-over auxiliary device for dance training, comprising a T-shaped base plate, a middle partition, an adjustment plate, an angle adjustment device, a driving device, a supporting device, a sliding adjustment device, and a pressing device. A T-shaped sliding groove is provided on the transverse support plate of the T-shaped base plate, and the middle two ends of the sliding groove are rotatably connected to a guide screw through a bearing, and the front two ends of the sliding groove are rotatably connected to an adjustment guide rod with a plum blossom-shaped cross-section through a bearing, the middle of the transverse support plate of the T-shaped base plate is fixedly connected to the middle of the middle partition spanning the sliding groove, and the T-shaped The bottom plate is symmetrically fixed with side partitions, and the middle parts of the outer walls of the left and right side partitions are rotatably connected with adjustment plates through bearings. A support rod is fixedly connected between the front ends of the two adjustment plates. An angle adjustment device is fixedly installed on the outer walls of the adjustment plates. The angle adjustment device includes an incomplete inner gear, a limit rack, a U-shaped rod, a sliding sleeve, a compression spring, and a limit ring. A driving device is installed on the inner wall of the adjustment plate, and the driving device includes a crank, a driving gear, a driven gear, a transmission chain, a driving shaft, and a driving gear. The middle part of the lower side of the inner wall of the left side partition and the middle partition are connected. A transmission shaft A is rotatably connected through a bearing, a transmission gear A is fixedly connected to the transmission shaft A, an adjusting gear A is fixedly connected to the guide screw on the lower side of the transmission gear A, the driving gear, transmission gear A and adjusting gear A are meshed and connected, a transmission shaft B is rotatably connected between the lower side inner wall of the right side partition and the middle partition through a bearing, a transmission shaft B is fixedly connected to the transmission shaft B, an adjusting gear B is fixedly connected to the adjusting guide rod on the lower side of the transmission gear B, the driving gear, transmission gear B and adjusting gear B are meshed and connected, and the two ends of the lead screw are symmetrically screwed and fixed The sliding adjustment device includes a sliding box, a support plate, a limiting ball rod, and an active bevel gear. A supporting device is fixedly connected to the support plate. The supporting device is a rectangular support block. A plug-in slot is provided on the rear outer wall of the support block. An L-shaped foot plate is slidably inserted in the plug-in slot and is fixed by a fixing bolt. A lower pressure groove is provided on the top surface of the support block. A lower pressure device is installed on the support plate on the lower side of the lower pressure groove. The lower pressure device includes a driven bevel gear, a threaded rod, a threaded cylinder, a limiting rod, a limiting sleeve, a fixing plate, a telescopic rod, a lower pressure rod, a lower pressure plate, and a silicone pad.

[0006] Furthermore, an incomplete internal gear is fixedly connected to the outer wall of the side partition, four sliding sleeves are symmetrically fixedly connected to the outer wall of the adjustment plate, the U-shaped rod is slidably inserted in the sliding sleeve, a limiting ring is fixedly connected to the U-shaped rod between the two sliding sleeves, and a compression spring is provided on the U-shaped rod between the limiting ring and the front sliding sleeve, a limiting rack is fixedly connected between the two ends of the U-shaped rod, and the limiting rack and the incomplete internal gear are meshed and connected.

[0007] Furthermore, a crank is rotatably connected to the outer wall of the front end of the adjustment plate through a bearing, and the end of the crank is fixedly connected to a driving gear after the front end passes through the adjustment plate. The middle part of the inner wall of the side partition and the middle part of the opposite outer wall of the middle partition are rotatably connected to a drive shaft through a bearing, and a driven gear and a driving gear are fixedly connected to the drive shaft in sequence, and a transmission chain is connected to the driving gear and the driven gear.

[0008] The two ends of the guide rail are connected with the guide rail of the T-shaped bottom plate, and the two ends of the guide rail are connected with the guide rail in a fixed manner.

[0009] The top end of the guide wheel assembly is fixedly mounted on the driving member, and the guide wheel assembly is engaged with the drive member. The guide wheel assembly is connected to the drive member by a threaded joint. The guide wheel assembly is fixedly mounted on the driving member.

[0010] Furthermore, the top surface of the T-shaped bottom plate, the outer wall of the support block, the top surface of the support plate outside the support block and the outer wall of the handrail are all fixedly covered with soft leather pads.

[0011] The beneficial effects of the present invention are as follows: the present invention has a reasonable structural design, and the user can lie on a T-shaped bottom plate to perform hip-stepping training. The present invention can be operated independently without the assistance of an outsider. The left crank can be rotated to move the support blocks on both sides closer or farther away, so that the support blocks spread the legs into a frog shape. The right crank can be rotated to adjust the pressure plate to press down the knees. The pressure strength and pressure distance can be adjusted according to personal needs to improve the training effect. The training can be performed by personal full manual operation. The use is simple, convenient, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attachment Figure 1 It is a structural schematic diagram of the present invention.

[0013] Attachment Figure 2 It is a schematic diagram of the T-shaped bottom plate structure of the present invention.

[0014] Attachment Figure 3 It is a schematic diagram of the inner structure of the left side adjustment plate of the present invention.

[0015] Attachment Figure 4 It is a schematic diagram of the outer structure of the left side adjustment plate of the present invention.

[0016] Attachment Figure 5 It is a schematic diagram of the outer structure of the right side adjustment plate of the present invention.

[0017] Attachment Figure 6 It is a schematic diagram of the inner structure of the right side adjustment plate of the present invention.

[0018] Attachment Figure 7 It is a structural schematic diagram of the angle adjustment device of the present invention.

[0019] Attachment Figure 8 It is a schematic structural diagram of the driving device of the present invention.

[0020] Attachment Figure 9 It is a schematic diagram of the connection structure of the supporting device, sliding adjustment device and pressing device of the present invention.

[0021] Attachment Figure 10 It is a schematic structural diagram of the support device of the present invention.

[0022] Attachment Figure 11 It is a schematic structural diagram of the sliding box of the present invention.

[0023] Attachment Figure 12 It is a schematic diagram of the limiting club structure of the present invention.

[0024] Attachment Figure 13 It is a structural schematic diagram of the pressing device of the present invention.

[0025] Attachment Figure 14 It is a schematic diagram of the exploded structure of the supporting device, sliding adjustment device and pressing device of the present invention.

[0026] Attachment Figure 15 It is a schematic structural diagram of the active bevel gear of the present invention.

[0027] Attachment Figure 16 It is a schematic diagram of the cross-sectional structure of the sliding box of the present invention. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0031] The following is combined with Figure 1 ~Attached Figure 16 The present invention is described in detail below.

[0032] like Figures 1 to 16As shown, the present application includes T-shaped base plate 1, intermediate partition 3, adjusting plate 5, angle adjusting device 6, driving device 7, supporting device 10, sliding adjusting device 8, pressing device 9, the transverse support plate of the T-shaped base plate 1 is provided with T-shaped sliding groove 2, the middle of the sliding groove 2 is rotatably connected with guide screw 12 through bearing, the front end of the sliding groove 2 is rotatably connected with adjusting guide rod 13 with plum blossom-shaped cross section through bearing, the middle of the transverse support plate of the T-shaped base plate 1 is fixedly connected with intermediate partition 3 across the sliding groove 2, the T-shaped base plate 1 on both sides of the intermediate partition 3 is fixedly and symmetrically connected with side partition 4, the outer wall of the left and right two side partitions 4 is rotatably connected with adjusting plate 5 through bearing, the front end of the two adjusting plates 5 is fixedly connected with supporting rod 20, the outer wall of the adjusting plate 5 is fixedly installed with angle adjusting device 6, the angle adjusting device 6 includes incomplete internal gear strip 6-6, limiting rack 6-5, U-shaped rod 6-2, sliding sleeve 6-1, compression spring 6-3 and limiting ring 6-4, the U-shaped rod 6-2 on both sides is pulled, the locking of the adjusting plate 5 can be contacted, the adjusting plate 5 can be rotated, the U-shaped rod 6-2 is loosened, the adjusting plate 5 can be locked, so that it cannot be rotated, the inner wall of the adjusting plate 5 is installed with driving device 7, the driving device 7 includes crank 7-1, driving gear 7-2, driven gear 7-4, transmission chain 7-3, driving shaft 7-5 and driving gear 7-6, the inner wall of the left side partition 4 is rotatably connected with transmission shaft A15 through bearing between the lower middle and the intermediate partition 3, the transmission shaft A15 is fixedly connected with transmission gear A14, the guide screw 12 on the lower side of the transmission gear A14 is fixedly connected with adjusting gear A16, the driving gear 7-6, transmission gear A14 and adjusting gear A16 are meshingly connected, the crank 7-1 on the left side is rotated, the adjusting gear A16 is rotated through gear transmission, so that the guide screw 12 is rotated, the sliding adjusting device 8 on both sides is close or far away, the inner wall of the right side partition 4 is rotatably connected with transmission shaft B17 through bearing between the lower side and the intermediate partition 3, the transmission shaft B17 is fixedly connected with transmission gear B18, the adjusting guide rod 13 on the lower side of the transmission gear B18 is fixedly connected with adjusting gear B19, the driving gear 7-6, transmission gear B18 and adjusting gear B19 are meshingly connected, the crank 7-1 on the right side is rotated, the adjusting gear B19 is rotated through gear transmission, so that the adjusting guide rod 13 is rotated, so that the driving bevel gear 8-5 is rotated, the adjustment driving of the pressing device 9 is realized, the both ends of the guide screw 12 are symmetrically screwed and fixed with sliding adjusting device 8, the sliding adjusting device 8 includes sliding box 8-2, supporting plate 8-1, limiting ball rod 8-4 and driving bevel gear 8-5, the supporting plate 8-1 is fixedly connected with supporting device 10, the supporting device 10 is a rectangular supporting block 10-1, the rear outer wall of the supporting block 10-1 is provided with insertion slot 10-3, the L-shaped foot plate 11 is slidably inserted into the insertion slot 10-3 and locked and fixed through fixing bolt,The top surface of the support block 10-1 is provided with a downward pressure groove 10-2. A downward pressure device 9 is mounted on the support plate 8-1 below the downward pressure groove 10-2. The downward pressure device 9 comprises a driven bevel gear 9-1, a threaded rod 9-2, a threaded cylinder 9-3, a limiting rod 9-4, a limiting sleeve 9-5, a fixing plate 9-6, a telescopic rod 9-7, a downward pressure rod 9-8, a downward pressure plate 9-9, and a silicone pad 9-10. The downward pressure plate 9-9 can press down on the trainee's knees, pushing them down and achieving the effect of stepping on the hips.

[0033] An incomplete internal gear 6-6 is fixedly connected to the outer wall of the side partition 4. Four sliding sleeves 6-1 are symmetrically fixedly connected to the outer wall of the adjustment plate 5. The U-shaped rod 6-2 is slidably inserted into the sliding sleeves 6-1. A limit ring 6-4 is fixedly connected to the U-shaped rod 6-2 between the two sliding sleeves 6-1. A compression spring 6-3 is sleeved on the U-shaped rod 6-2 between the limit ring 6-4 and the front sliding sleeve 6-1. A limit rack 6-5 is fixedly connected between the two ends of the U-shaped rod 6-2. The limit rack 6-5 and the incomplete internal gear 6-6 are meshed and connected. Pulling the U-shaped rod 6-2 disengages the limit rack 6-5 and the incomplete internal gear 6-6, unlocking the adjustment plate 5 and allowing it to rotate and adjust its angle. Loosening the U-shaped rod 6-2 causes the limit rack 6-5 and the incomplete internal gear 6-6 to mesh, locking the adjustment plate 5 and preventing it from rotating.

[0034] The front end outer wall of the adjustment plate 5 is rotatably connected to a crank handle 7-1 via a bearing. The front end of the crank handle 7-1 passes through the adjustment plate 5, and its end is fixedly connected to a driving gear 7-2. The middle portion of the inner wall of the side partition 4 and the middle portion of the outer wall opposite to the middle partition 3 are rotatably connected to a drive shaft 7-5 via a bearing. The drive shaft 7-5 is fixedly connected to a driven gear 7-4 and a driving gear 7-6 in sequence. The driving gear 7-2 and the driven gear 7-4 are connected by a transmission chain 7-3. When the crank handle 7-1 is rotated, the driving gear 7-2 rotates, which in turn drives the driven gear 7-4 to rotate via the transmission chain 7-3, thereby driving the coaxial driving gear 7-6 to rotate, thereby providing the driving force for adjustment.

[0035] The upper opening of the sliding box 8-2 is fixedly installed with a supporting plate 8-1. The two ends of the supporting plate 8-1 are slidably connected to the wall of the sliding groove 2 and its upper end surface is flush with the top surface of the T-shaped bottom plate 1. Two threaded holes 8-7 are symmetrically provided in the middle of the box walls on both sides of the sliding box 8-2. The two threaded holes 8-7 are screwed onto the guide screw 12. The internal threads of the threaded holes 8-7 of the two sliding boxes 8-2 on both sides are opposite. Two sliding holes 8-3 are symmetrically provided on the front side of the box walls on both sides of the sliding box 8-2. The adjusting guide rod 13 slides It is movably inserted in the sliding hole 8-3, and the middle sliding sleeve of the adjusting guide rod 13 in the sliding box 8-2 is provided with a driving bevel gear 8-5. The inner through hole of the driving bevel gear 8-5 matches the cross-section of the adjusting guide rod 13. Four limiting ball rods 8-4 are symmetrically provided on both sides of the driving bevel gear 8-5. One end of the limiting ball rod 8-4 is fixedly connected to the inner wall of the sliding box 8-2, and the inner end of the limiting ball rod 8-4 is rotatably connected to the rotating ball 8-6, and the rotating ball 8-6 ​​is in rotational contact with the wheel surfaces on both sides of the driving bevel gear 8-5. When the left crank 7-1 is rotated, since the threaded holes 8-7 of the sliding boxes 8-2 on both sides are screwed in opposite directions, the support blocks 10-1 on both sides will move closer or farther away. When the sliding box 8-2 moves, the limiting ball rods 8-4 on both sides will drive the active bevel gear 8-5 to slide on the adjusting guide rod 13 and maintain its position in the sliding box 8-2. When the right crank 7-1 is rotated, the adjusting guide rod 13 will be rotated, and the rotation of the adjusting guide rod 13 will drive the active bevel gear 8-5 to rotate. The rotating ball 8-6 ​​on the limiting ball rod 8-4 will rotate on the wheel surface of the active bevel gear 8-5, which will not affect the rotation of the active bevel gear 8-5. The support plate 8-1 is flush with the top surface of the T-shaped base plate 1 and has a longer support block 10-1, which can provide support for the trainee's calf and prevent the trainee's calf from being suspended above the sliding groove 2 and causing discomfort.

[0036] The support block 10-1 is fixed to one end of the inner side of the support plate 8-1, and a threaded rod 9-2 is rotatably inserted on the support plate 8-1 through a bearing. The lower end of the threaded rod 9-2 is fixedly connected to a driven bevel gear 9-1, and the driven bevel gear 9-1 is meshed with the active bevel gear 8-5. The upper end of the threaded rod 9-2 is screwed and fixed with a threaded cylinder 9-3. One end of the inner side of the top surface of the support plate 8-1 in the lower pressure groove 10-2 is fixedly connected to a limiting rod 9-4, and a limiting sleeve 9-5 is slidably sleeved on the limiting rod 9-4. The outer wall of one side of the limiting sleeve 9-5 is fixedly connected to the lower end of the outer wall of the threaded cylinder 9-3 with a fixing plate 9-6, and the upper end of the threaded cylinder 9-3 is hingedly fixed with a telescopic rod 9-7 through a damping hinge, and the telescopic part of the telescopic rod 9-7 is locked and fixed by a fixing bolt, and the other end of the telescopic rod 9-7 is fixedly connected to a downward pressure rod 9-8 perpendicular to it, and the lower end of the downward pressure rod 9-8 is hingedly fixed with a downward pressure plate 9-9 through a damping hinge, and the bottom surface of the downward pressure plate 9-9 is fixedly connected with a silicone pad 9-10. The telescopic rod 9-7 can adjust the outward extension length and can be adjusted as needed. The telescopic rod 9-7 and the lower pressure plate 9-9 can be rotated and adjusted. The adjustable lower pressure plate 9-9 is located just above the knees, so that the lower pressure plate 9-9 can be pressed down to the trainee's knees. The silicone pad 9-10 can make the contact with the knees more comfortable. When the right crank 7-1 is rotated, the adjustment guide rod 13 will be driven to rotate, thereby driving the active bevel gear 8-5 to rotate, and the active bevel gear 8-5 will drive the driven bevel gear 9-1 to rotate. By limiting the threaded cylinder 9-3 through the limiting sleeve 9-5, the threaded cylinder 9-3 can be made to rise or fall, so that the lower pressure plate 9-9 can be adjusted to rise or fall, thereby realizing the hip-stepping operation.

[0037] The top surface of the T-shaped base plate 1, the outer wall of the support block 10 - 1, the top surface of the support plate 8 - 1 outside the support block 10 - 1 and the outer wall of the handrail 20 are all fixedly covered with soft leather pads.

[0038] When in use, the trainee lies on the front support plate of the T-shaped base plate 1, the thighs of both legs lean against the front outer wall of the support block 10-1, the calves are perpendicular to the thighs and lean against the outer wall of the support block 10-1, the calves are supported on the support plate 8-1 and the feet are supported on the L-shaped foot plate 11. The extended length of the L-shaped foot plate 11 can be adjusted according to the height and leg length and locked by fixing bolts. The adjustable lower pressure plate 9-9 is above the knees. Then, after lying down, pull the U-shaped rod 6-2 to unlock the adjustment plate 5, rotate the adjustment plate 5 to the upper side of the body, loosen the U-shaped rod 6-2, and under the action of the compression spring 6-3, the limit rack 6-5 and the incomplete inner gear 6-6 will engage and lock, so that the position of the adjustment plate 5 is fixed and cannot be rotated anymore. The left crank handle 7-1 can be rotated to move the support blocks 10-1 on both sides away from each other, so that the support blocks 10-1 will stretch the legs into a frog shape, and the right crank handle 7-1 can be rotated to adjust the lower pressure plate 9-9 to press down the knees. The downward pressure strength and downward pressure distance can be adjusted according to personal needs, and the knees are gradually pressed down to the bottom to continuously stretch the trainee's hips. According to training needs, after the downward pressure time is over, the left crank handle 7-1 can be rotated in the opposite direction to adjust the lower pressure plate 9-9 to rise away from the knees, and the left crank handle 7-1 can be rotated to bring the support blocks 10-1 on both sides closer, so that the U-shaped rod 6-2 can be pulled to rotate the adjustment plate 5 upward, and the U-shaped rod 6-2 can be released to lock the adjustment plate 5, so that the trainee can stand up easily, and the handrail 20 can be pulled by hand to stand up easily.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0040] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A leg-pressing and step-over assisting device for dance training, comprising a T-shaped base plate, a middle partition, an adjustment plate, an angle adjustment device, a driving device, a supporting device, a sliding adjustment device, and a pressing device, characterized in that: The t-shaped bottom plate is provided with a T-shaped sliding groove on the transverse support plate, and the middle ends of the sliding groove are rotatably connected to the guide screws through bearings, and the front ends of the sliding groove are rotatably connected to the adjustment guide rods with a plum blossom-shaped cross section through bearings. The middle of the transverse support plate of the T-shaped bottom plate is fixedly connected to the middle of the middle partition plate spanning the sliding groove, and the side partitions are symmetrically fixedly connected to the T-shaped bottom plates on both sides of the middle partition plate. The middle of the outer walls of the left and right side partitions are rotatably connected to the adjustment plates through bearings, and a handrail is fixedly connected between the front ends of the two adjustment plates. The outer wall of the adjusting plate is fixedly installed with an angle adjustment device, and the angle adjustment device includes an incomplete inner gear, a limiting rack, a U-shaped rod, a sliding sleeve, a compression spring, and a limiting ring. A driving device is installed on the inner wall of the adjusting plate, and the driving device includes a crank, a driving gear, a driven gear, a transmission chain, a driving shaft, and a driving gear. The middle part of the lower side of the inner wall of the left side partition plate and the middle partition plate are rotatably connected with a transmission shaft A through a bearing, and the transmission shaft A is fixedly connected with the transmission gear A, and the guide screw under the transmission gear A is fixedly connected with the adjusting gear A, and the driving gear, the transmission gear A and the adjusting gear A are meshed and connected. The lower side of the inner wall of the right side partition plate and the middle partition plate are rotatably connected through a bearing, and the transmission shaft B is fixedly connected with the transmission gear B, and the adjusting guide rod under the transmission gear B is fixedly connected with the adjusting gear B, and the driving gear, the transmission gear B and the adjusting gear B are meshed and connected. The two ends of the lead screw are symmetrically screwed and fixed with a sliding adjustment device, and the sliding adjustment device includes a sliding box , a supporting plate, a limiting ball rod, and an active bevel gear. A supporting device is fixedly connected to the supporting plate, and the supporting device is a rectangular supporting block. A plug-in slot is provided on the rear outer wall of the supporting block. An L-shaped foot plate is slidably inserted in the plug-in slot and fixed by locking with a fixing bolt. A lower pressing groove is provided on the top surface of the supporting block, and a lower pressing device is installed on the supporting plate on the lower side of the lower pressing groove. The lower pressing device includes a driven bevel gear, a threaded rod, a threaded cylinder, a limiting rod, a limiting sleeve, a fixing plate, a telescopic rod, a lower pressing rod, a lower pressing plate, and a silicone pad; An incomplete internal gear is fixedly connected to the outer wall of the side partition, four sliding sleeves are symmetrically fixedly connected to the outer wall of the adjustment plate, the U-shaped rod is slidably inserted into the sliding sleeve, a limiting ring is fixedly connected to the U-shaped rod between the two sliding sleeves, a compression spring is sleeved on the U-shaped rod between the limiting ring and the front sliding sleeve, a limiting rack is fixedly connected between the two ends of the U-shaped rod, and the limiting rack is meshed with the incomplete internal gear; The front end outer wall of the adjustment plate is rotatably connected to a crank via a bearing. The front end of the crank passes through the adjustment plate and its end is fixedly connected to a driving gear. The middle part of the inner wall of the side partition and the middle part of the outer wall opposite to the middle partition are rotatably connected to a drive shaft via a bearing. The drive shaft is fixedly connected to a driven gear and a driving gear in sequence. A transmission chain is connected to the driving gear and the driven gear. The two ends of the guide rail are fixedly mounted on the sliding box upper end opening, and the two ends of the guide rail are slidably connected to the sliding groove wall, and the upper end surface of the guide rail is flush with the top surface of the T-shaped bottom plate. The two box walls on both sides of the sliding box are symmetrically provided with two threaded holes, the two threaded holes are screwed on the guide screws, and the internal threads of the threaded holes of the two sliding boxes on both sides are opposite. The two sliding holes are symmetrically provided on the front sides of the box walls on both sides of the sliding box. The adjusting guide rod in the sliding box is slidably sleeved with an active bevel gear in the middle of the adjusting guide rod, and the inner through hole of the active bevel gear matches the cross section of the adjusting guide rod. Four limiting ball rods are symmetrically provided on both sides of the active bevel gear The top end of the guide wheel assembly is fixedly provided with a toothed connecting strip which is cooperatively connected with the guide wheel assembly, and the guide wheel assembly is connected with the toothed connecting strip which is cooperatively connected with the guide wheel assembly.

2. The leg-stretching and step-over assisting device for dance training according to claim 1, characterized in that: The top surface of the T-shaped bottom plate, the outer wall of the support block, the top surface of the support plate outside the support block and the outer wall of the handrail are all fixedly covered with soft leather pads.

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