Portable pull-up auxiliary device for student physique test

Abstract

The invention relates to the technical field of sports equipment, and discloses a portable pull-up auxiliary device for student physique testing, which comprises supports and a cross bar, an auxiliary mechanism is arranged between the two supports, the top of each support is provided with an adjusting mechanism, the adjusting mechanism is connected with the cross bar, and the cross bar is connected with the auxiliary mechanism. A protection mechanism is arranged on the top of the adjusting mechanism, and magnesium powder mechanisms are arranged on the sides, away from each other, of the two supports. The auxiliary mechanism comprises two first supporting plates, the outer sides of the first supporting plates are fixedly connected to the outer side of the support, the two first supporting plates are oppositely arranged, and the tops of the first supporting plates are fixedly connected with supporting rods. Auxiliary elastic force is provided through the first spring and acts on the sliding plate to support the student, and the pull-up difficulty is reduced. Students with weak strength can smoothly complete pull-up actions by means of auxiliary support of the compression spring, the situation that the students cannot participate in the test due to insufficient strength is reduced, and the test result can more comprehensively reflect the physical conditions of student groups.

Description

Technical Field

[0001] The invention relates to the technical field of sports equipment, in particular to a portable pull-up auxiliary device for students' physical fitness test. Background Art

[0002] Pull-ups are a common strength training and physical test item. They mainly rely on the strength of the upper limbs, especially the synergy of the biceps, latissimus dorsi and other muscle groups, to complete the action. In the physical fitness test of students, pull-ups, as an important test item, are of key significance for measuring students' upper limb strength, body coordination and overall physical fitness. With the increasing attention paid to students' physical health, the scientificity, fairness and adaptability of pull-up tests to different individual students have become the focus of attention in the field of education.

[0003] Traditional pull-up test equipment is usually relatively simple, mainly composed of a horizontal bar with a fixed height and a bracket. When taking the test, students can only rely on their own strength to complete the pull-up action. The surface material of the horizontal bar is generally ordinary metal or plastic, and some of them will undergo some simple anti-slip treatment, such as adding some textures.

[0004] Existing pull-up test equipment lacks an effective auxiliary mechanism for individual strength differences among students. Due to the inability to provide adjustable auxiliary support force, students with weaker strength often face difficulties in pull-up tests, and may even be unable to complete the most basic movements. This not only causes these students to perform poorly in the test, but may also cause the risk of injury due to excessive force. At the same time, it also makes it difficult for the test results to fully cover the physical conditions of students with different strength levels, and cannot accurately reflect the true physical fitness distribution of the student group. For students with stronger strength, the fixed difficulty test equipment cannot further accurately test their extreme abilities, and it is difficult to distinguish their strength and skill differences at a higher level. It is impossible to provide a more targeted stratified teaching basis for physical education, which is not conducive to the formulation and implementation of personalized physical training plans for students. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a portable pull-up auxiliary device for students' physical fitness testing, which solves the problem that the existing pull-up testing equipment lacks an effective auxiliary mechanism for individual strength differences among students.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A portable pull-up auxiliary device for students' physical fitness test, comprising a bracket and a cross bar, an auxiliary mechanism is arranged between two brackets, an adjustment mechanism is arranged on the top of the bracket, the adjustment mechanism is connected to the cross bar, a protection mechanism is arranged on the top of the adjustment mechanism, and a magnesium powder mechanism is arranged on the far side of the two brackets;

[0007] The auxiliary mechanism includes two support plates 1, the outer side of the support plate 1 is fixedly connected to the outer side of the bracket, the two support plates 1 are arranged opposite to each other, the top of the support plate 1 is fixedly connected to a support rod, the top of the support rod is fixedly connected to a support plate 2, the outer side of the support plate 2 is fixedly connected to the outer side of the bracket, the two support plates 2 are arranged opposite to each other, the outer side of the support rod is slidably connected to a sliding plate, a pedal is fixedly connected between the two sliding plates, a spring 1 is arranged between the sliding plate and the support plate 2, and a set of the springs is arranged on the outside of the support rod, and adjustment components are arranged on both sides of the outside of the two support plates 2, and the adjustment components are used to adjust the position of the support plate 2.

[0008] Preferably, the adjustment assembly includes a mounting shell, an inner wall of the mounting shell is slidably connected to a movable plate, one end of the movable plate is fixedly connected to an insertion rod, the other end of the movable plate is fixedly connected to a pull rod, a plurality of slots are provided on the outer side of the bracket, the insertion rod is plugged into the slots, a second spring is provided between the movable plate and the mounting shell, and the second spring is sleeved on the outside of the pull rod.

[0009] Preferably, a connecting plate is fixedly connected to the outside of the mounting shell, and the outer side of the connecting plate is fixedly connected to the outer side of the second supporting plate.

[0010] Preferably, a guide rod is slidably connected to the inner through hole of the sliding plate, and the guide rod is fixedly connected between the first support plate and the second support plate.

[0011] Preferably, the adjustment mechanism includes two adjustment rods, the outer sides of the adjustment rods are inserted into the inner wall of the bracket, the inner wall of the adjustment rods is provided with a plurality of connecting holes, the adjustment rods are connected to the bracket through a fastening screw, the ends of the fastening screws that are close to each other are threadedly connected with a knob cover, the cross bar is arranged between the two adjustment rods, the ends of the fastening screws that are far away are fixedly connected with a connecting handle, and the outer side of the connecting handle is provided with an anti-slip groove.

[0012] Preferably, the protective mechanism comprises two fixed plates, both sides of the bottom of the fixed plates are fixedly connected with connecting ropes, one end of the connecting rope away from the fixed plates is fixedly connected with a protective belt, and the protective belt is located directly above the pedal.

[0013] Preferably, the magnesium powder mechanism includes a storage box, a sealing cover is provided on the top of the storage box, a connecting assembly is provided between the storage box and the sealing cover, the connecting assembly is used to connect the storage box and the sealing cover, the inner wall of the storage box is slidably connected with a movable plate, the outside of the movable plate is provided with a guide assembly, the guide assembly is used to guide the movable plate when it moves, the bottom wall of the movable plate is provided with a contact rod, the inner wall of the storage box is rotatably connected with two discharging plates, a spring three is provided between the top of the discharging plate and the inner wall of the storage box, the bottom of the storage box is fixedly connected with a discharging cover, the top of the movable plate is fixedly connected with a connecting rod, the top of the connecting rod is fixedly connected with a pressing plate, a spring four is provided between the pressing plate and the sealing cover, the spring four is sleeved on the outside of the connecting rod, and a fixing assembly is provided on the outside of the storage box, and the fixing assembly is used to fix the storage box.

[0014] Preferably, the connecting assembly includes magnet one and magnet two, wherein magnet one is arranged at the bottom of the storage box, and magnet two is arranged at the top of the storage box, and magnet one cooperates with magnet two.

[0015] Preferably, the guide assembly includes two guide plates and two guide grooves, the two guide plates are fixedly connected to both sides of the movable plate, the two guide grooves are both opened on the inner wall of the storage box, and the outer sides of the guide plates are slidably connected to the inner walls of the guide grooves.

[0016] Preferably, the fixing assembly includes a locking plate and a connecting plate, the locking plate is fixedly connected to the outside of the storage box, the connecting plate is fixedly connected to the outside of the bracket, and one end of the locking plate is inserted into the through hole of the connecting plate.

[0017] The present invention provides a portable pull-up auxiliary device for students' physical fitness test. It has the following beneficial effects:

[0018] 1. The present invention provides auxiliary elastic force through spring 1, which acts on the sliding plate to support students and reduce the difficulty of pull-ups. With the auxiliary support of the compression spring, students with weaker strength can successfully complete the pull-up action, reducing the situation where they cannot participate in the test due to insufficient strength, so that the test results can more comprehensively reflect the physical condition of the student group. Students with stronger strength can reduce the assistance by stretching the spring, and can be tested at a difficulty close to the standard pull-up, ensuring the validity and discrimination of the test results, and accurately measuring their true level. At the same time, the adjustable design ensures the fairness of the testing process, avoids score deviations due to equipment differences, provides schools with a reliable testing tool, and helps to scientifically evaluate students' physical fitness, so as to formulate physical education teaching plans and training programs in a targeted manner and improve the overall physical health level of students.

[0019] 2. The present invention allows students to take out magnesium powder by simply pressing a button. It is simple and easy to use, and can accurately control the outflow of magnesium powder. The degree of pressing determines the downward movement of the movable plate, thereby controlling the degree of opening and closing of the discharging plate and the outflow of magnesium powder to avoid waste. The guide plate and the guide groove cooperate to ensure stable movement and smooth discharging. The use of magnesium powder can effectively improve the stability of grasping the crossbar, reduce the risk of slipping, make the pull-up movements coherent and standardized, and help students to display their level. It can provide good assistance to students during physical fitness tests, improve test results and ensure safety.

[0020] 3. The present invention greatly improves the safety of the test through the design of the protective belt. Once a student falls accidentally, the protective belt can be quickly tightened to bear the tension, preventing the student from falling directly to the ground and getting injured, so that the student can focus on the test performance without any worries. The height adjustment function is very practical and can accurately adapt to the needs of students of different heights. Short students can easily grab the horizontal bar of appropriate height, and tall students can also find the ideal gripping position, so that all students can be tested under conditions that are comfortable and suitable for themselves, ensuring the fairness of the test, which is conducive to accurately evaluating the true level of students' pull-ups and promoting the efficient and scientific development of physical fitness testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the protection mechanism of the present invention;

[0023] Figure 3 It is a schematic diagram of the pedal structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the installation shell structure of the present invention;

[0025] Figure 5 For the present invention Figure 4 A in the enlarged view;

[0026] Figure 6 It is a schematic diagram of the structure of the regulating mechanism of the present invention;

[0027] Figure 7 It is a schematic diagram of the magnesium powder mechanism structure of the present invention;

[0028] Figure 8 For the present invention Figure 7 The enlarged view of point B in the figure;

[0029] Fig. 9 For the present invention Figure 7 Enlarged view of point C in the figure.

[0030] Among them, 1, bracket; 2, auxiliary mechanism; 201, support plate 1; 202, support rod; 203, support plate 2; 204, spring 1; 205, sliding plate; 206, guide rod; 207, connecting plate; 208, mounting shell; 209, movable plate; 2010, plug rod; 2011, pedal; 2012, pull rod; 2013, spring 2; 2014, slot; 3, cross bar; 4, adjustment mechanism; 401, adjustment rod; 402, fastening screw; 403, connecting handle; 404, knob cover; 4 ...406, sliding plate; 407, sliding plate; 408, sliding plate; 409, sliding plate; 4010, sliding plate; 4011, sliding plate; 4012, sliding plate; 408, sliding plate; 409, sliding plate; 4013, sliding plate; 409, sliding plate; 40 5. Connecting hole; 5. Protective mechanism; 501. Fixed plate; 502. Connecting rope; 503. Protective belt; 6. Magnesium powder mechanism; 601. Storage box; 602. Sealing cover; 603. Moving plate; 604. Connecting rod; 605. Pressing plate; 606. Contact rod; 607. Guide plate; 608. Guide groove; 609. Spring three; 6010. Discharging plate; 6011. Discharging cover; 6012. Locking plate; 6013. Connecting plate; 6014. Magnet one; 6015. Magnet two; 6016. Spring four. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the specification 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.

[0032] See also Figure 1-Figure 9 The embodiment of the present invention provides a portable pull-up auxiliary device for students' physical fitness test, including a bracket 1 and a cross bar 3. The bracket 1 provides a basic frame structure for the entire pull-up auxiliary device, and the cross bar 3 is the main gripping part for students when performing pull-ups. An auxiliary mechanism 2 is arranged between the two brackets 1 to reduce the difficulty of pull-ups. An adjustment mechanism 4 is arranged on the top of the bracket 1, which can flexibly adjust the height of the cross bar 3. The adjustment mechanism 4 is connected to the cross bar 3, and a protective mechanism 5 is arranged on the top of the adjustment mechanism 4. The protective belt 503 is located at the waist position of the student and is connected to the fixed plate 501 through a connecting rope 502. During the process of students pulling up, if they lose balance or lose strength and fall, they can be prevented. A magnesium powder mechanism 6 is arranged on the far side of the two brackets 1 to facilitate students to obtain magnesium powder before pull-ups.

[0033] The auxiliary mechanism 2 includes two support plates 1 201, the outer side of the support plate 1 201 is fixedly connected to the outer side of the bracket 1, and the two support plates 1 201 are arranged opposite to each other, providing a stable bottom support foundation for the entire auxiliary mechanism 2, and they determine the horizontal position and span of the auxiliary mechanism 2. The top of the support plate 1 201 is fixedly connected to a support rod 202, and the top of the support rod 202 is fixedly connected to a support plate 2 203, and the outer side of the support plate 2 203 is fixedly connected to the outer side of the bracket 1. The two support plates 203 are arranged opposite to each other, and the support rod 202 connects the support plate 1 201 and the support plate 2 203, playing a key role in vertical support and guidance, and providing a path for the sliding plate 205 to slide up and down. The outer side of the support rod 202 is slidably connected with a sliding plate 205, and a pedal 2011 is fixedly connected between the two sliding plates 205. When the pedal 2011 moves, the sliding plate 205 is driven to move, thereby stretching or compressing the spring 1 204, providing auxiliary support for students to do pull-ups, and the pedal 2011 provides a standing platform for students. A spring 1 204 is arranged between the sliding plate 205 and the second support plate 203. The spring 1 204 is sleeved on the outside of the support rod 202 and can generate elastic forces of different sizes according to its own compression or stretching state. When the student stands on the pedal 2011, the spring 1 204 is compressed, generating an upward elastic force, providing auxiliary support for the student to do pull-ups, and reducing the force that the student's arm needs to bear during the pull-ups.

[0034] See also Figure 4-Figure 5, both sides of the outer sides of the two support plates 203 are provided with adjustment components, which are used to adjust the position of the support plates 203. The adjustment components include a mounting shell 208, which provides a stable accommodation and installation space for components such as the movable plate 209, the plug rod 2010, and the pull rod 2012. The inner wall of the mounting shell 208 is slidably connected with the movable plate 209, so that the movable plate 209 can slide linearly and flexibly in the mounting shell 208. One end of the movable plate 209 is fixedly connected with the plug rod 2010. When the movable plate 209 slides, it can directly drive the plug rod 2010 to move synchronously, so that the plug rod 2010 can be accurately inserted into or pulled out of the slot 2014 on the outer side of the bracket 1, thereby playing a role of fixing or releasing the fixation. The other end of the movable plate 209 is fixedly connected with a pull rod 2012, which is convenient for the user to apply external force by pulling the pull rod 2012, and effectively transmit the human-operated force to the movable plate 209. The outer side of the bracket 1 is provided with multiple slots 2014, and the plug rod 2010 is plugged into the slots 2014. The multiple slots 2014 provide multiple selectable fixed positions. Through the cooperation of the plug rod 2010 with different slots 2014, the position of the support plate 203 can be flexibly adjusted as needed, and then the spring 1 204 is stretched or compressed. A spring 2013 is arranged between the movable plate 209 and the mounting shell 208. The spring 2013 is sleeved on the outside of the pull rod 2012. During the adjustment operation, the spring 2013 plays a reset role. When the external force (the force pulling the pull rod 2012) is withdrawn, it can rely on its own elastic force to push the movable plate 209 back to the initial position, prompting the plug rod 2010 to automatically insert back into the corresponding slot 2014.

[0035] See also Figure 2-Figure 4 The outside of the mounting shell 208 is fixedly connected with a connecting plate 207, and the outer side of the connecting plate 207 is fixedly connected to the outer side of the supporting plate 203. The mounting shell 208 is firmly connected to the supporting plate 203 through the connecting plate 207. When the position of the supporting plate 203 is adjusted, the mounting shell 208 is moved under the action of the connecting plate 207, thereby driving the supporting plate 203 to move, thereby adjusting the compression or extension state of the spring 1 204.

[0036] See also Figure 1-Figure 3 The guide rod 206 is slidably connected to the inner through hole of the sliding plate 205, and the guide rod 206 is fixedly connected between the support plate 1 201 and the support plate 2 203, providing a precise guide for the up and down movement of the sliding plate 205. It is ensured that the sliding plate 205 can only move linearly along the guide rod 206 when it is subjected to the gravity of the pedal 2011 and the elastic force of the spring 1 204, so that the auxiliary support force of the spring 1 204 can stably act on the sliding plate 205 and the pedal 2011, thereby providing a stable and reliable auxiliary support effect for students, allowing students to feel uniform and predictable assistance during the pull-up process.

[0037] See also Figure 1 , Figure 2 and Figure 6 The adjusting mechanism 4 includes two adjusting rods 401. The outer side of the adjusting rod 401 is inserted into the inner wall of the bracket 1. The adjusting rod 401 is connected to the bracket 1 through a fastening screw 402. The outer side of the adjusting rod 401 is inserted into the inner wall of the bracket 1 and connected through the fastening screw 402, which ensures the stability of the connection between the adjusting rod 401 and the bracket 1, so that the cross bar 3 will not shake or move when it is subjected to the force of the student's pull-up, providing a basis for the height adjustment of the adjusting rod 401. By changing the relative position of the adjusting rod 401 in the bracket 1, the height of the cross bar 3 can be flexibly adjusted. The inner wall of the adjusting rod 401 is provided with a plurality of connecting holes 405, and the plurality of connecting holes 405 provide accurate and diverse options for the height positioning of the adjusting rod 401. When adjusting the height of the cross bar 3, the connecting handle 403 can be inserted into the appropriate connecting hole 405 according to the height of the student, so that the cross bar 3 is stably fixed at the required height, meeting the most comfortable conditions for students of different heights. The fastening screw 402 is threadedly connected to a knob cover 404 at one end thereof. After adjusting the height of the cross bar 3, the fastening screw 402 can be firmly fixed by tightening the knob cover 404 to prevent the adjusting rod 401 from loosening and sliding due to external force during use, thereby ensuring the stability and safety of the device during the entire use cycle. The cross bar 3 is arranged between the two adjusting rods 401, and the two adjusting rods 401 provide a stable support structure for the cross bar 3. The fastening screw 402 is fixedly connected to a connecting handle 403 at one end thereof which is far away. The outer side of the connecting handle 403 is provided with an anti-skid groove. The connecting handle 403 is convenient for the user to operate. When adjusting the height of the cross bar 3, the user can easily hold the connecting handle 403 to pull it out or insert it from the connecting hole 405, which is convenient for height adjustment operation. The anti-skid groove increases the friction between the hand and the handle.

[0038] See also Figure 1 , Figure 2 and Figure 6The protective mechanism 5 includes two fixed plates 501, which serve as the fixed base points of the connecting rope 502 and provide a stable upper force point for the entire protective mechanism 5. The bottom sides of the fixed plate 501 are fixedly connected with the connecting rope 502, and the end of the connecting rope 502 away from the fixed plate 501 is fixedly connected with the protective belt 503, which connects the fixed plate 501 and the protective belt 503, and acts as a bridge for force transmission. It has certain flexibility and strength, and can smoothly transfer the tension of the protective belt 503 to the fixed plate 501 when the student's body falls accidentally, and at the same time, the length and angle can be appropriately adjusted according to the movement posture of the student's body. The protective belt 503 is located just above the pedal 2011, and the position of the protective belt 503 is positioned so that it can just act on the student's waist. When the student stands on the pedal 2011 to do pull-ups, if there is a situation where the strength is insufficient or the body is unbalanced and falls, the protective belt 503 can quickly and effectively bear the gravity of the student's body, prevent the body from continuing to fall, and minimize the risk of the student colliding with the ground or other components.

[0039] See also Figure 1 , Figure 2 , Figure 7 , Figure 8 and Fig. 9The magnesium powder mechanism 6 includes a storage box 601, which provides a special storage space for magnesium powder, can store magnesium powder in a centralized manner, prevent magnesium powder from being scattered randomly, ensure that it is in a relatively stable and orderly storage environment, and is convenient for management and use. It is also conducive to maintaining the dryness and usability of magnesium powder, ensuring that it can provide effective gripping assistance for students at any time. A sealing cover 602 is provided on the top of the storage box 601, which can effectively prevent external dust, water vapor and other impurities from entering the storage box 601, and prevent the magnesium powder from being contaminated and damp, which affects its effect of increasing friction. The inner wall of the storage box 601 is slidably connected with a moving plate 603, and the bottom wall of the moving plate 603 is provided with a contact rod 606. The contact rod 606 is a direct component for triggering the discharge. When the moving plate 603 moves downward, it contacts the discharge plate 6010 and applies appropriate pressure, so that the opening and closing action of the discharge plate 6010 can accurately respond to the position change of the moving plate 603, thereby realizing effective control of the outflow of magnesium powder, allowing students to obtain an appropriate amount of magnesium powder according to actual needs, avoiding waste or insufficient use of magnesium powder. The inner wall of the storage box 601 is rotatably connected with two discharge plates 6010, and the discharge plates 6010 can rely on their own structure or the action of spring three 609 to remain closed to prevent leakage of magnesium powder; and when the contact rod 606 applies pressure, the discharge plate 6010 can flexibly rotate around the connection point to open, so that the magnesium powder flows out under the action of gravity, which not only ensures the sealed preservation of the magnesium powder, but also enables smooth discharge when needed. A spring 3 609 is provided between the top of the discharging plate 6010 and the inner wall of the storage box 601, and the spring 3 609 provides elastic force for the discharging plate 6010 to reset. When the pressure of the contact rod 606 disappears, the spring 3 609 can quickly push the discharging plate 6010 back to the initial closed position, automatically close the discharging channel, ensure the proper storage of the magnesium powder when not in use, and reduce the loss of magnesium powder caused by accidental leakage. A discharging cover 6011 is fixedly connected to the bottom of the storage box 601, and the discharging cover 6011 plays the role of guiding and gathering the magnesium powder. It can guide the magnesium powder flowing out of the discharging plate 6010 to the hands of the students, making it easier for the students to obtain and apply the magnesium powder, and improving the convenience and efficiency of taking the magnesium powder. The top of the movable plate 603 is fixedly connected with a connecting rod 604. When the student presses the pressing plate 605, the pressing force is accurately transmitted to the movable plate 603 through the connecting rod 604, so that the movable plate 603 moves in the expected direction and amplitude, thereby triggering the opening and closing action of the discharge plate 6010. The top of the connecting rod 604 is fixedly connected with a pressing plate 605. The student only needs to gently press the pressing plate 605 to operate the magnesium powder discharge. The operation is simple and easy to understand, and does not require complicated operating skills or tools.A spring four 6016 is arranged between the pressing plate 605 and the sealing cover 602. The spring four 6016 is sleeved on the outside of the connecting rod 604 to provide a restoring elastic force after the pressing plate 605 is pressed. When the student releases the pressing plate 605, the spring four 6016 can automatically pull the pressing plate 605 back to the initial position, thereby driving the moving plate 603, the contact rod 606 and other related components to return to their original state, so that the discharge plate 6010 is closed, which is convenient for the student's next use.

[0040] See also Figure 7-Figure 9 A connecting component is provided between the storage box 601 and the sealing cover 602, and the connecting component is used to connect the storage box 601 and the sealing cover 602. The connecting component includes a magnet 1 6014 and a magnet 2 6015. The magnet 1 6014 is arranged at the bottom of the storage box 601, and the magnet 2 6015 is arranged at the top of the storage box 601. The magnet 1 6014 cooperates with the magnet 2 6015 to realize the connection between the storage box 601 and the sealing cover 602 by the suction force of the magnet. This connection method is simple and convenient, does not require complex mechanical structures or tools, is convenient for students or operators to quickly open and close the sealing cover 602, improves the use efficiency, and is convenient for adding magnesium powder in the storage box 601.

[0041] See also Figure 7-Figure 8 A guide assembly is provided on the outside of the movable plate 603, and the guide assembly is used to guide the movable plate 603 when it moves. The guide assembly includes two guide plates 607 and two guide grooves 608. The two guide plates 607 are respectively fixedly connected to the two sides of the movable plate 603, and the two guide grooves 608 are both opened on the inner wall of the storage box 601. The outer side of the guide plate 607 is slidably connected to the inner wall of the guide groove 608. The cooperation between the guide plate 607 and the guide groove 608 provides precise guidance for the movement of the movable plate 603, ensuring that the contact rod 606 at the bottom of the movable plate 603 can accurately act on the discharge plate 6010, thereby realizing precise control of the magnesium powder discharge amount and improving the accuracy and reliability of magnesium powder extraction.

[0042] See also Figure 1 and Figure 7 A fixing component is provided on the outside of the storage box 601, and the fixing component is used to fix the storage box 601. The fixing component includes a locking plate 6012 and a connecting plate 6013. The locking plate 6012 is fixedly connected to the outside of the storage box 601, and the connecting plate 6013 is fixedly connected to the outside of the bracket 1. One end of the locking plate 6012 is inserted into the through hole of the connecting plate 6013. The locking plate 6012 and the connecting plate 6013 are plugged into each other to firmly fix the storage box 601 on the bracket 1, ensuring that the storage box 601 is in a stable position during the use of the entire pull-up auxiliary device.

[0043] Working principle: When students are ready to do the pull-up test, they first apply magnesium powder on their hands. By pressing the pressing plate 605, the pressing plate 605 compresses the spring four 6016 under pressure, and pushes the moving plate 603 to move downward in the storage box 601 through the connecting rod 604. The guide plates 607 on both sides of the moving plate 603 slide downward along the guide grooves 608 on the inner wall of the storage box 601, ensuring the accuracy and stability of the moving direction of the moving plate 603. As the moving plate 603 moves downward, the contact rod 606 at its bottom will contact and press down the discharge plate 6010. Under the pressure of the contact rod 606, the discharge plate 6010 overcomes the elastic force of the spring three 609 and rotates around the connection point with the storage box 601 to open. At this time, the magnesium powder in the storage box 601 flows out through the discharge cover 6011 under the action of gravity and falls on the hands of the students. In this way, students can apply magnesium powder on their hands to increase the friction between their hands and the crossbar 3, making it more stable when grasping the crossbar 3, which helps students to perform pull-ups more smoothly and ensures the continuity and standardization of the movement. When the pressing plate 605 is released, the spring 4 6016 drives the pressing plate 605 back to its original position, and then drives the contact rod 606 to move to its original position, so that the discharge plate 6010 is closed.

[0044] After using magnesium powder, the student stands on the pedal 2011 and puts the protective belt 503 around the waist. After the student stands on the pedal 2011, he holds the cross bar 3 with both hands and starts to do pull-ups. At this time, the weight of the pedal 2011 causes the pedal 2011 connected between the two sliding plates 205 to move downward, and the sliding plate 205 slides on the support rod 202 along the guide rod 206. At this time, the spring 1 204 located between the sliding plate 205 and the support plate 2 203 is compressed. When the student does pull-ups with force, the body moves upward. At this time, the spring 1 204 is compressed and generates an upward elastic force. This elastic force acts on the sliding plate 205, and then plays a role of auxiliary support for the weight of the student standing on the pedal 2011. For students with weaker strength, this auxiliary support can reduce the strength that the student's arm needs to bear during the pull-ups.

[0045] By pulling the pull rod 2012, the pull rod 2012 drives the movable plate 209 to slide on the inner wall of the mounting shell 208. As the movable plate 209 moves, the insertion rod 2010 fixed at one end of the movable plate 209 is pulled out from the corresponding slot 2014 on the bracket 1. At this time, the fixed restriction on the position of the second support plate 203 is released, and the second support plate 203 can be moved up or down (relative to the initial position). After moving to a suitable position, the pull rod 2012 is released, and the insertion rod 2010 is inserted into the corresponding slot 2014 under the elastic action of the second spring 2013, which causes the first spring 204 to be stretched or compressed. When the spring 204 is stretched, the elastic force of the spring 204 is proportional to the elongation. When the spring 204 is stretched, the vertical component of the elastic force on the pedal 2011 will decrease. When the spring 204 is compressed, the vertical component of the elastic force on the pedal 2011 will increase, thereby reducing or increasing the support effect on the student. When the strength is weak, compressing the spring can get more support and reduce the difficulty of pull-ups. After the strength is increased, stretching the spring can reduce assistance. In group tests, you can adjust according to your own situation to ensure fair competition. At the same time, let students better adapt to the test requirements in daily training and effectively improve the training and test results of pull-ups.

[0046] The protective belt 503 is connected to the fixing plate 501 through the connecting rope 502, and the protective belt 503 is located at the waist of the student. If the student loses balance or lacks strength during the pull-up process and falls down, the protective belt 503 will be tightened due to the tension of the student's body, and the connecting rope 502 will transfer this tension to the fixing plate 501. The protective belt 503 can effectively prevent the student's body from continuing to fall, play a role in protecting the student's safety, and prevent the student from falling directly to the ground and getting injured.

[0047] When the height of the crossbar 3 needs to be adjusted, the knob cover 404 is turned to disengage the knob cover 404 from the fastening screw 402, and then the connecting handle 403 is held and pulled out from the connecting hole 405. At this time, the adjusting rod 401 can slide up and down on the inner wall of the bracket 1. When the adjusting rod 401 slides to a suitable height position, the connecting handle 403 is inserted into the connecting hole 405, and the knob cover 404 is tightened on the fastening screw 402. The height of the crossbar 3 can be flexibly adjusted according to the height of the students. For students with shorter height, the crossbar 3 can be lowered so that they can easily grasp the crossbar 3 to perform pull-ups; and for students with taller height, the crossbar 3 can be raised to ensure that they grasp the crossbar 3 at a suitable position and angle, so that each student can perform the pull-up test in the most comfortable state that best meets their own physical conditions.

[0048] 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 portable pull-up auxiliary device for students' physical fitness test, comprising a bracket (1) and a crossbar (3), characterized in that: An auxiliary mechanism (2) is arranged between the two brackets (1); an adjustment mechanism (4) is arranged on the top of the bracket (1); the adjustment mechanism (4) is connected to the cross bar (3); a protection mechanism (5) is arranged on the top of the adjustment mechanism (4); and a magnesium powder mechanism (6) is arranged on the side away from each other of the two brackets (1); The auxiliary mechanism (2) comprises two support plates (201), the outer side of the support plate (201) is fixedly connected to the outer side of the bracket (1), the two support plates (201) are arranged opposite to each other, the top of the support plate (201) is fixedly connected to a support rod (202), the top of the support rod (202) is fixedly connected to a support plate (203), the outer side of the support plate (203) is fixedly connected to the outer side of the bracket (1), and the two support plates (203) are arranged opposite to each other. The outer side of the support rod (202) is slidably connected to a sliding plate (205), a pedal (2011) is fixedly connected between the two sliding plates (205), a spring (204) is arranged between the sliding plate (205) and the second support plate (203), the spring (204) is sleeved on the outside of the support rod (202), and adjustment components are arranged on both sides of the outside of the two support plates (203), and the adjustment components are used to adjust the position of the second support plate (203).

2. A portable pull-up auxiliary device for students' physical fitness test according to claim 1, characterized in that: The adjustment component comprises a mounting shell (208), the inner wall of which is slidably connected to a movable plate (209), one end of which is fixedly connected to an insertion rod (2010), and the other end of which is fixedly connected to a pull rod (2012), a plurality of slots (2014) are provided on the outer side of the bracket (1), the insertion rod (2010) is plugged into and fits with the slots (2014), a second spring (2013) is provided between the movable plate (209) and the mounting shell (208), and the second spring (2013) is sleeved on the outside of the pull rod (2012).

3. A portable pull-up auxiliary device for students' physical fitness test according to claim 2, characterized in that: The outside of the installation shell (208) is fixedly connected to a connecting plate (207), and the outer side of the connecting plate (207) is fixedly connected to the outer side of the second supporting plate (203).

4. A portable pull-up auxiliary device for students' physical fitness test according to claim 1, characterized in that: A guide rod (206) is slidably connected to the internal through hole of the sliding plate (205), and the guide rod (206) is fixedly connected between the first support plate (201) and the second support plate (203).

5. A portable pull-up auxiliary device for students' physical fitness test according to claim 4, characterized in that: The adjustment mechanism (4) comprises two adjustment rods (401), the outer sides of the adjustment rods (401) are inserted into the inner wall of the bracket (1), the inner wall of the adjustment rods (401) is provided with a plurality of connection holes (405), the adjustment rods (401) are connected to the bracket (1) via a fastening screw (402), the proximal ends of the fastening screws (402) are threadedly connected with a knob cover (404), the cross bar (3) is arranged between the two adjustment rods (401), the distal ends of the fastening screws (402) are fixedly connected with a connection handle (403), and the outer side of the connection handle (403) is provided with an anti-slip groove.

6. A portable pull-up auxiliary device for students' physical fitness test according to claim 1, characterized in that: The protective mechanism (5) comprises two fixed plates (501), both sides of the bottom of the fixed plates (501) are fixedly connected with connecting ropes (502), one end of the connecting rope (502) away from the fixed plates (501) is fixedly connected with a protective belt (503), and the protective belt (503) is located directly above the pedal (2011).

7. A portable pull-up auxiliary device for students' physical fitness test according to claim 1, characterized in that: The magnesium powder mechanism (6) comprises a storage box (601), a sealing cover (602) is arranged on the top of the storage box (601), a connecting assembly is arranged between the storage box (601) and the sealing cover (602), the connecting assembly is used to connect the storage box (601) and the sealing cover (602), the inner wall of the storage box (601) is slidably connected to a moving plate (603), the outer part of the moving plate (603) is provided with a guide assembly, the guide assembly is used to guide the moving plate (603) when it moves, the bottom wall of the moving plate (603) is provided with a contact rod (606), the inner wall of the storage box (601) is rotatably connected to two discharge plates (603), and the inner wall of the storage box (601) is rotatably connected to two discharge plates (603). 010), a spring three (609) is arranged between the top of the discharge plate (6010) and the inner wall of the storage box (601), the bottom of the storage box (601) is fixedly connected with a discharge cover (6011), the top of the movable plate (603) is fixedly connected with a connecting rod (604), the top of the connecting rod (604) is fixedly connected with a pressing plate (605), a spring four (6016) is arranged between the pressing plate (605) and the sealing cover (602), the spring four (6016) is sleeved on the outside of the connecting rod (604), and a fixing component is arranged on the outside of the storage box (601), and the fixing component is used to fix the storage box (601).

8. A portable pull-up auxiliary device for students' physical fitness test according to claim 7, characterized in that: The connection assembly includes magnet one (6014) and magnet two (6015), wherein magnet one (6014) is arranged at the bottom of the storage box (601), and magnet two (6015) is arranged at the top of the storage box (601), and magnet one (6014) cooperates with magnet two (6015).

9. A portable pull-up auxiliary device for students' physical fitness test according to claim 7, characterized in that: The guide assembly comprises two guide plates (607) and two guide grooves (608); the two guide plates (607) are respectively fixedly connected to the two sides of the movable plate (603); the two guide grooves (608) are both opened on the inner wall of the storage box (601); and the outer side of the guide plate (607) is slidably connected to the inner wall of the guide groove (608).

10. A portable pull-up auxiliary device for students' physical fitness test according to claim 1, characterized in that: The fixing assembly comprises a locking plate (6012) and a connecting plate (6013), wherein the locking plate (6012) is fixedly connected to the outside of the storage box (601), and the connecting plate (6013) is fixedly connected to the outside of the bracket (1), and one end of the locking plate (6012) is inserted into a through hole of the connecting plate (6013).

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