Mechanical experiment trolley

Abstract

The invention relates to the field of mechanics experiment trolleys, in particular to a mechanics experiment trolley which comprises a mechanics trolley body, the mechanics trolley body comprises a control box, a guide rail is installed on the lower portion of one side of the control box, side plates are fixedly connected to the front side and the rear side of the top of the guide rail, and a baffle is fixedly connected to the side, away from the control box, of the top of the guide rail. A shell is arranged at the top of the guide rail, an expansion groove is formed in the middle of the top end of the shell, a plurality of balancing weights are arranged on the inner side of the top of the expansion groove, magnetic coatings are arranged on the upper portions and the lower portions of the balancing weights, a wireless charging area is arranged in the middle of the bottom end of the shell, and walking wheels are installed on the front portions and the rear portions of the two sides of the bottom end of the shell. The gravity center of the trolley can be finely adjusted by adjusting the amount of the counterweight liquid in the different sleeves, so that the gravity center of the trolley can be kept in the center, the trolley can be kept stable as much as possible, and the situation that the advancing direction of the trolley is affected due to gravity center shift, and the final experimental result is inaccurate is avoided.

Description

Technical Field

[0001] The present invention relates to the field of mechanical experiment trolleys, and particularly to a mechanical experiment trolley. Background Art

[0002] Mechanics is an independent basic discipline, mainly studying energy and force and their relationships with the equilibrium, deformation or motion of solids, liquids and gases. Mechanics can be roughly divided into three parts: statics, kinematics and dynamics. Mechanics occupies a very large proportion in physics textbooks. When studying kinematics, in order to enable students to more intuitively understand the content in the books, some experimental tools are often used for experiments. However, most of the existing experimental tools have relatively single functions. For example, the existing mechanical experiment trolleys can only conduct experiments on the moving speed and cannot intuitively show the influence of various mechanical parameters on the effect, resulting in a poor demonstration effect on students. At the same time, the trolleys used for dynamic teaching demonstrations or experiments are poorly made and inaccurate in measurement. Therefore, we propose a mechanical experiment trolley to solve the above-mentioned problems. Summary of the Invention

[0003] The purpose of the present invention is to solve the deficiencies in the background art and propose a mechanical experiment trolley.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a mechanical experiment trolley, including a mechanical trolley, the mechanical trolley includes a control box, a guide rail is installed at the lower part on one side of the control box, side plates are fixedly connected to both the front and rear sides of the top of the guide rail, a baffle is fixedly connected to the side of the top of the guide rail away from the control box, a housing is arranged on the top of the guide rail, an expansion slot is installed in the middle of the top of the housing, a plurality of counterweights are arranged on the inner side of the top of the expansion slot, magnetic coatings are arranged on both the upper and lower parts of the counterweights, a wireless charging area is arranged in the middle of the bottom of the housing, walking wheels are installed on both the front and rear parts on both sides of the bottom of the housing, the walking wheels are all arranged inside the guide grooves, and the guide grooves are all opened on the front and rear sides of the middle of the top of the guide rail. A towing head is installed on the side of the housing away from the control box, expansion holes are opened on both the front and rear sides of the end of the housing close to the towing head, and a liquid storage tank is installed in the middle and lower part of the housing.

[0005] Preferably, input pipes are fixedly connected to both the front and rear sides of the bottom of the liquid storage tank, pump bodies are fixedly connected to the ends of the input pipes away from the liquid storage tank, output pipes are fixedly connected to the output ends of the pump bodies, sleeves are fixedly connected to the ends of the output pipes away from the pump bodies, inner cavities are arranged inside the sleeves, inner cylinders are slidably connected inside the inner cavities, and the ends of the output pipes away from the pump bodies all penetrate through the side walls of the sleeves and are arranged inside the inner cavities.

[0006] Preferably, a fixed plate is arranged in the upper middle part of the shell. The top of the fixed plate is fixedly connected to the bottom of the expansion slot. A limiting slot is opened in the middle and lower part of the fixed plate. A slider is slidably connected inside the limiting slot. A threaded rod passes through and is threadedly connected to the middle of the slider. One end of the threaded rod passes through the fixed plate and the end of the shell and is fixedly connected to an adjusting knob. Fixed blocks are fixedly connected to the lower parts of the front and rear ends of the slider. A rotating frame is rotatably connected inside each fixed block. A counterweight roller is rotatably connected to the outer periphery of a part of the rotating frame away from the fixed block. End face gears are arranged on one side of each fixed block.

[0007] Preferably, circulating toothed belts are arranged on the upper parts of the front and rear ends of the fixed plate. Drive shafts are arranged on both inner sides of the circulating toothed belts. A driven bevel gear is fixedly connected to one side of the middle part of the outer periphery of one of the drive shafts. The driven bevel gear is meshed and connected to a driving bevel gear on one side. The driving bevel gear is fixedly connected to the outer peripheral end of a rotating shaft. The end of the rotating shaft away from the driving bevel gear is fixedly connected to the driving end of a servo motor.

[0008] Preferably, a control main board is installed on one side of the middle part of the shell. A plurality of data interfaces are arranged on one side of the bottom of the control main board. The data interfaces all pass through the middle part of one end of the shell. The control main board is electrically connected to a control box.

[0009] Preferably, a wireless charging module is installed on the bottom of the shell. The wireless charging module is arranged directly above the wireless charging area. The wireless charging module is electrically connected to the control main board. A plurality of sensors are installed on the inner edge of the shell.

[0010] Preferably, the end face gears are all meshed and connected to one side of a toothed ring. The end face gears are all rotatably connected to the outside of limiting blocks. The limiting blocks are all fixedly connected to both sides of the front and rear parts of the slider. Electric push rods are rotatably connected to the upper middle parts of the front and rear ends of the slider.

[0011] Preferably, driven gears are fixedly connected to the outer peripheries of the electric push rods. The driven gears are all meshed and connected to the bottom of the circulating toothed belts. Tooth columns are fixedly connected to the telescopic ends of the electric push rods.

[0012] Preferably, the end of the rotating shaft away from the driving bevel gear passes through a side wall of the shell. The servo motor is installed in the upper middle part of one end of the shell. The driving bevel gear and the driven bevel gear are both arranged inside the fixed plate.

[0013] Preferably, the wireless charging module is arranged below the liquid storage bin and below the control main board.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The guide grooves on the guide rail can guide and limit the walking wheels at the bottom of the trolley, preventing the trolley from deviating from the track during movement. The baffle and side plate can limit the guide rail, preventing the trolley from rushing out of the guide rail, which is beneficial to the stable progress of the experiment. During the experiment, weights can be conveniently added to the trolley through the weight blocks. The magnetic paint on the weight blocks enables the weight blocks to adsorb to each other, allowing the weight blocks to be stably arranged inside the expansion slots and preventing the weight blocks from slipping easily during the movement of the trolley, which is beneficial to the stable progress of the experiment.

[0015] During the trolley movement experiment, people can pump out the weight liquid in the liquid chamber through the pump body. Then, through the pump body, the weight liquid can be transported into each sleeve through the output pipe. By adjusting the amount of weight liquid in different sleeves, the center of gravity of the trolley can be finely adjusted, enabling the center of gravity of the trolley to remain at the central position, so that the trolley can maintain stability as much as possible, avoiding the situation where the moving direction of the trolley is affected by the offset of the center of gravity, resulting in inaccurate final experimental results.

[0016] During the experiment, after adding weight blocks to the trolley, people can rotate the threaded rod through the adjustment knob on one side of the trolley. The threaded rod can drive the slider to move along the limit groove, thereby driving the weight rollers on both sides of the slider to move. Through the weight rollers, the center of gravity inside the trolley can be further adjusted, so that the center of gravity of the trolley is not affected by the added weight blocks. At the same time, people can observe the relationship between the center of gravity and the speed of the trolley, which is beneficial for practical use.

[0017] During the process of adjusting the position of the weight rollers, people can drive the rotating shaft to rotate through the servo motor. The rotating shaft can drive the active bevel gear to rotate synchronously. The active bevel gear can drive the transmission shaft to rotate by using the meshing driven bevel gear. The transmission shaft can drive the circulating toothed belt to rotate. The circulating toothed belt can drive the toothed ring to rotate synchronously by using the driven gear and the tooth column. Thus, the rotating frame and the weight rollers can be deflected by using the end face gear meshing on one side, enabling people to adjust the actual position of the weight rollers, making the work of adjusting the center of gravity of the trolley smoother. At the same time, the adjustment range of the weight rollers can be effectively increased, making the exploration of the relationship between the center of gravity and the speed of the trolley more operable during the experiment, which is beneficial for practical use. Description of the Drawings

[0018] Figure 1 It is a front three-dimensional structural schematic diagram of a mechanical experiment trolley of the present invention; Figure 2 It is a partial structural schematic diagram of a mechanical experiment trolley of the present invention; Figure 3 It is a partial structural top view schematic diagram of a mechanical experiment trolley of the present invention; Figure 4 It is a bottom-up partial structure schematic diagram of a mechanical experiment trolley of the present invention; Figure 5 It is one of the partial structure schematic diagrams of the lower part inside the housing of a mechanical experiment trolley of the present invention; Figure 6 It is the second partial structure schematic diagram of the lower part inside the housing of a mechanical experiment trolley of the present invention; Figure 7 It is the third partial structure schematic diagram of the lower part inside the housing of a mechanical experiment trolley of the present invention; Figure 8 It is the partial structure schematic diagram of the liquid storage bin of a mechanical experiment trolley of the present invention; Figure 9 It is the partial structure schematic diagram of the upper part inside the housing of a mechanical experiment trolley of the present invention; Figure 10 It is the partial structure schematic diagram of the active bevel gear of a mechanical experiment trolley of the present invention; Figure 11 It is the partial structure schematic diagram of the driven bevel gear of a mechanical experiment trolley of the present invention; Figure 12 It is the partial structure schematic diagram of the driven gear of a mechanical experiment trolley of the present invention; Figure 13 It is the control system flow schematic diagram of a mechanical experiment trolley of the present invention.

[0019] 1. Mechanical trolley; 101. Control box; 102. Guide rail; 103. Baffle; 104. Expansion slot; 105. Counterweight; 106. Guide groove; 107. Towing head; 108. Side plate; 109. Housing; 110. Traveling wheel; 111. Expansion hole; 112. Wireless charging area; 113. Inner cylinder; 114. Control main board; 115. Pump body; 116. Output pipe; 117. Input pipe; 118. Liquid storage bin; 119. Wireless charging module; 120. Sleeve; 121. Inner cavity; 122. Threaded rod; 123. Fixed plate; 124. Limiting groove; 125. Counterweight roller; 126. Circulating toothed belt; 127. Rotating frame; 128. Fixed block; 129. Servo motor; 130. Rotating shaft; 131. Transmission shaft; 132. End face gear; 133. Tooth column; 134. Active bevel gear; 135. Limiting block; 136. Tooth ring; 137. Electric push rod; 138. Driven bevel gear; 139. Slide block; 140. Driven gear. Detailed implementation manners

[0020] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0021] As Figures 1 - 13 shown, a mechanical experiment trolley includes a mechanical trolley 1. The mechanical trolley 1 includes a control box 101, inside which there is a sensor assembly, including motion displacement, speed, acceleration, and an embedded force sensor (measuring the magnitude of tensile and compressive forces), with built-in 3-axis (x, y, z three directions) acceleration and 3-axis (x, y, z three directions) angular velocity sensors. At the lower part of one side of the control box 101, there is a guide rail 102. On the top of the guide rail 102, side plates 108 are fixedly connected to both the front and rear sides. On the side of the top of the guide rail 102 away from the control box 101, there is a baffle 103 fixedly connected. On the top of the guide rail 102, there is a housing 109. In the middle of the top of the housing 109, there is an expansion slot 104. Inside the top of the expansion slot 104, there are multiple counterweights 105. Magnetic coatings are provided on both the upper and lower parts of the counterweights 105. In the middle of the bottom of the housing 109, there is a wireless charging area 112. On both the front and rear parts of both sides of the bottom of the housing 109, there are walking wheels 110 installed. The walking wheels 110 use high-speed bearings, with a high idling speed, smooth movement, and low friction. The walking wheels 110 are all arranged inside the guide grooves 106, and the guide grooves 106 are all opened on the front and rear sides of the middle of the top of the guide rail 102. On the side of the housing 109 away from the control box 101, there is a towing head 107 installed. On both the front and rear sides of one end of the housing 109 close to the towing head 107, there are expansion holes 111 opened. On one side of the middle inside the housing 109, there is a control main board 114 installed. On one side of the bottom of the control main board 114, there are multiple data interfaces, and the data interfaces all penetrate through the middle of one end of the housing 109. The control main board 114 is electrically connected to the control box 101. Inside the bottom of the housing 109, there is a wireless charging module 119 installed. The wireless charging module 119 is arranged directly above the wireless charging area 112. The wireless charging module 119 is electrically connected to the control main board 114. Inside the housing 109, there are multiple sensors installed on the side. The trolley is built-in with a Bluetooth wireless module, and the trolley is directly connected to a data acquisition terminal (computer, tablet or mobile phone) through the Bluetooth wireless module, which is convenient for data measurement during movement and data acquisition in various experimental environments. The multiple measurements of the sensors are combined into one, and it can simultaneously measure displacement, speed, acceleration, and force. When in use, there is no need for a data collector. The sensors built into the trolley have unique digital identification codes, which are convenient for selective connection by the data terminal. It uses rechargeable lithium polymer, does not require calibration, and can be used immediately after connection. It can be set to automatic zero calibration or manual zero calibration using software. When in use, the sensors are powered on, but if there is no connection or the connection is inactive, the power supply will be automatically turned off, thus enabling high energy efficiency.

[0022] Further, in specific implementation, during actual use, people can use the mechanical trolley 1 to conduct a control experiment on mechanical properties. The traction head 107 can be used to tow the trolley body. The guide rail 102 can provide a smooth moving track for the trolley. The guide groove 106 on the guide rail 102 can guide and limit the traveling wheels 110 at the bottom of the trolley to prevent the trolley from deviating from the track during movement. The baffle 103 and the side plate 108 can limit the guide rail 102 to prevent the trolley from rushing out of the guide rail 102, which is conducive to the stable progress of the experimental process. During the experiment, the counterweight block 105 can facilitate people to add counterweights to the trolley. The magnetic coating on the counterweight block 105 enables the counterweight blocks 105 to adsorb to each other, so that the counterweight block 105 can be stably arranged inside the expansion slot 104, and the counterweight block 105 will not easily slide off during the movement of the trolley, which is conducive to the stable progress of the experiment.

[0023] Among them, the wireless charging module 119 is arranged on the lower side of the liquid storage bin 118 and at the lower part of the control main board 114. Both the front and rear sides of the bottom of the liquid storage bin 118 are fixedly connected with input pipes 117. One end of each input pipe 117 far away from the liquid storage bin 118 is fixedly connected with a pump body 115. The output ends of the pump bodies 115 are fixedly connected with output pipes 116. One end of each output pipe 116 far away from the pump body 115 is fixedly connected with a sleeve 120. An inner cavity 121 is arranged inside each sleeve 120. An inner cylinder 113 is slidably connected inside each inner cavity 121. One end of each output pipe 116 far away from the pump body 115 penetrates through the side wall of the sleeve 120 and is arranged inside the inner cavity 121; Further, in specific implementation, the wireless charging module 119 enables the trolley to be wirelessly charged using the wireless charging area 112. During the trolley movement experiment, people can pump out the counterweight liquid in the liquid storage bin 118 through the pump body 115, and then use the output pipe 116 to transport the counterweight liquid into each sleeve 120 through the pump body 115. By adjusting the amount of counterweight liquid in different sleeves 120, the center of gravity of the trolley can be finely adjusted, so that the center of gravity of the trolley can be kept at the central part, thereby enabling the trolley to maintain stability as much as possible and avoiding the situation that the traveling direction of the trolley is affected due to the deviation of the center of gravity, resulting in inaccurate final experimental results.

[0024] Among them, a fixed plate 123 is arranged in the upper middle part inside the housing 109. The top of the fixed plate 123 is fixedly connected to the bottom of the expansion slot 104. A limiting slot 124 is opened in the middle and lower part of the fixed plate 123. A slider 139 is slidably connected inside the limiting slot 124. A threaded rod 122 passes through the middle of the slider 139 and is threadedly connected thereto. One end of the threaded rod 122 passes through the fixed plate 123 and the end of the housing 109 and is fixedly connected to an adjustment knob. Fixed blocks 128 are fixedly connected to the lower parts of the front and rear ends of the limiting block 135. A rotating frame 127 is rotatably connected inside each of the fixed blocks 128. A counterweight roller 125 is rotatably connected to the outer circumference of a part of the rotating frame 127 away from the fixed block 128. End face gears 132 are arranged on one side of each of the fixed blocks 128. The end face gears 132 are all meshed and connected to one side of a toothed ring 136. The end face gears 132 are all rotatably connected to the outside of the limiting block 135. The limiting blocks 135 are fixedly connected to the front and rear sides of the middle parts of the slider 139. Electric push rods 137 are rotatably connected to the upper middle parts of the front and rear ends of the slider 139. Driven gears 140 are fixedly connected to the outer circumferences of the electric push rods 137. The driven gears 140 are all meshed and connected to the bottom of a circulating toothed belt 126. Tooth columns 133 are fixedly connected to the telescopic ends of the electric push rods 137; Further, in specific implementation, during the experiment, after adding the counterweight block 105 to the trolley, people can rotate the threaded rod 122 through the adjustment knob on one side of the trolley. Through the threaded rod 122, the slider 139 can be driven to move along the limiting slot 124, so as to drive the counterweight rollers 125 on both sides of the slider 139 to move. Through the counterweight rollers 125, the center of gravity inside the trolley can be further adjusted, so that the center of gravity of the trolley will not be affected by the added counterweight block 105. At the same time, people can observe the relationship between the center of gravity and the speed of the trolley, which is beneficial to actual use.

[0025] Among them, circulating toothed belts 126 are arranged on the upper parts of the front and rear ends of the fixed plate 123. Transmission shafts 131 are arranged on both sides inside the circulating toothed belts 126. A driven bevel gear 138 is fixedly connected to one side of the middle part of the outer circumference of one of the transmission shafts 131. The driven bevel gear 138 is meshed and connected to a driving bevel gear 134 on one side. The driving bevel gear 134 is fixedly connected to the outer circumference of the end of a rotating shaft 130. One end of the rotating shaft 130 away from the driving bevel gear 134 is fixedly connected to the driving end of a servo motor 129. One end of the rotating shaft 130 away from the driving bevel gear 134 passes through a side wall of the housing 109. The servo motor 129 is installed in the upper middle part of one end of the housing 109. The driving bevel gear 134 and the driven bevel gear 138 are both arranged inside the fixed plate 123; Further, in specific implementation, during the process of adjusting the position of the counterweight roller 125, people can drive the rotating shaft 130 to rotate through the servo motor 129. Through the rotating shaft 130, the driving bevel gear 134 can be driven to rotate synchronously. Through the driving bevel gear 134, the driven bevel gear 138 engaged therewith can drive the transmission shaft 131 to rotate. Through the transmission shaft 131, the endless toothed belt 126 can be driven to rotate. Through the endless toothed belt 126, the driven gear 140 can be driven to rotate. Through the driven gear 140, the electric push rod 137 can be driven to rotate synchronously. At this time, the electric push rod 137 will drive the toothed column 133 to contract, so that the toothed column 133 can be engaged with the inner side of the toothed ring 136. At this time, through the toothed column 133, the toothed ring 136 can be driven to rotate synchronously. When the toothed ring 136 rotates, the end face gear 132 engaged on one side will be driven to rotate. Through the rotation of the end face gear 132, the rotating frame 127 and the counterweight roller 125 can be deflected, so that people can adjust the actual position of the counterweight roller 125, making the work of adjusting the center of gravity of the trolley smoother. At the same time, the adjustment range of the counterweight roller 125 can be effectively increased, making the exploration of the relationship between the center of gravity and the trolley speed more operable during the experiment.

[0026] Working principle: In actual use, people can use the mechanical trolley 1 to conduct a control experiment on mechanical properties. The traction head 107 can be used to tow the trolley body, the guide rail 102 can provide a smooth moving track for the trolley, and the guide groove 106 on the guide rail 102 can guide and limit the traveling wheels 110 at the bottom of the trolley to prevent the trolley from deviating from the track during movement. The baffle 103 and the side plate 108 can limit the guide rail 102 to prevent the trolley from rushing out of the guide rail 102, which is conducive to the stable progress of the experimental process. During the experiment, the counterweight block 105 can facilitate people to add counterweights to the trolley. The magnetic paint on the counterweight block 105 enables the counterweight blocks 105 to adsorb to each other, so that the counterweight blocks 105 can be stably arranged inside the expansion slot 104, and the counterweight blocks 105 will not easily slip during the movement of the trolley, which is conducive to the stable progress of the experiment. The wireless charging module 119 enables the trolley to be wirelessly charged using the wireless charging area 112. During the trolley movement experiment, people can pump out the counterweight liquid in the liquid chamber 118 through the pump body 115, and then use the output pipe 116 through the pump body 115 to transport the counterweight liquid into each sleeve 120. By adjusting the amount of counterweight liquid in different sleeves 120, the center of gravity of the trolley can be finely adjusted so that the center of gravity of the trolley can be maintained at the central position, thus enabling the trolley to maintain stability as much as possible and avoiding the situation where the center of gravity deviation affects the traveling direction of the trolley, resulting in inaccurate final experimental results. At the same time, during the experiment, after adding the counterweight block 105 to the trolley, people can rotate the threaded rod 122 through the adjustment knob on one side of the trolley. The threaded rod 122 can drive the slider 139 to move along the limit slot 124, thereby driving the counterweight rollers 125 on both sides of the slider 139 to move. Through the counterweight rollers 125, the internal center of gravity of the trolley can be further adjusted, so that the center of gravity of the trolley is not affected by the added counterweight block 105, and at the same time enables people to observe the relationship between the center of gravity and the trolley speed, which is conducive to actual use. During the process of adjusting the position of the counterweight roller 125, people can drive the rotating shaft 130 to rotate through the servo motor 129. The rotating shaft 130 can drive the active bevel gear 134 to rotate synchronously. The active bevel gear 134 can drive the transmission shaft 131 to rotate by using the meshing driven bevel gear 138. The transmission shaft 131 can drive the endless tooth belt 126 to rotate. The endless tooth belt 126 can drive the driven gear 140 to rotate. The driven gear 140 can drive the electric push rod 137 to rotate synchronously. At this time, the electric push rod 137 will drive the tooth column 133 to contract, so that the tooth column 133 can mesh with the inner side of the tooth ring 136. At this time, the tooth column 133 can drive the tooth ring 136 to rotate synchronously. When the tooth ring 136 rotates, it will drive the end face gear 132 meshing on one side to rotate. The rotation of the end face gear 132 can drive the rotating frame 127 and the counterweight roller 125 to deflect.It enables people to adjust the actual position of the counterweight roller 125, making the work of adjusting the center of gravity of the trolley smoother. At the same time, it can effectively increase the adjustment range of the counterweight roller 125, making the exploration of the relationship between the center of gravity and the trolley speed more operable during the experiment and beneficial to practical use.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical experiment trolley, comprising a mechanical trolley (1), characterized in that: The mechanical trolley (1) includes a control box (101). A guide rail (102) is installed at the lower part of one side of the control box (101). Side plates (108) are fixedly connected to the front and rear sides of the top of the guide rail (102). A baffle (103) is fixedly connected to the side of the top of the guide rail (102) away from the control box (101). A housing (109) is arranged on the top of the guide rail (102). An expansion slot (104) is installed in the middle of the top of the housing (109). A plurality of counterweight blocks (105) are arranged inside the top of the expansion slot (104). Magnetic coatings are arranged on the upper and lower parts of the counterweight blocks (105). A wireless charging area (112) is arranged in the middle of the bottom end of the housing (109). Travel wheels (110) are installed on the front, rear, left and right sides of the bottom end of the housing (109). The travel wheels (110) are all arranged inside guide grooves (106). The guide grooves (106) are respectively opened on the front and rear sides of the middle of the top of the guide rail (102). A towing head (107) is installed on the side of the housing (109) away from the control box (101). Expansion holes (111) are respectively opened on the front and rear sides of one end of the housing (109) close to the towing head (107). A liquid storage tank (118) is installed in the middle and lower part of the housing (109).

2. The mechanical experimental trolley according to claim 1, wherein: Input pipes (117) are fixedly connected to the front and rear sides of the bottom of the liquid storage tank (118). Pump bodies (115) are fixedly connected to the ends of the input pipes (117) away from the liquid storage tank (118). Output pipes (116) are fixedly connected to the output ends of the pump bodies (115). The ends of the output pipes (116) away from the pump bodies (115) are fixedly connected to sleeves (120). Inner cavities (121) are arranged inside the sleeves (120). Inner cylinders (113) are slidably connected to the inside of the inner cavities (121). The ends of the output pipes (116) away from the pump bodies (115) penetrate through the side walls of the sleeves (120) and are arranged inside the inner cavities (121).

3. The mechanical experimental trolley according to claim 1, characterized in that: A fixing plate (123) is arranged in the upper middle part of the housing (109). The top of the fixing plate (123) is fixedly connected to the bottom of the expansion slot (104). A limiting slot (124) is opened in the middle and lower part of the fixing plate (123). A slider (139) is slidably connected to the inside of the limiting slot (124). A threaded rod (122) penetrates through the middle of the slider (139) and is in threaded connection therewith. One end of the threaded rod (122) penetrates through the fixing plate (123) and the end of the housing (109) and is fixedly connected to an adjusting knob. Fixed blocks (128) are fixedly connected to the lower parts of the front and rear ends of the slider (139). Rotary frames (127) are rotatably connected to the inside of the fixed blocks (128). Counterweight rollers (125) are rotatably connected to the outer circumferences of the parts of the rotary frames (127) away from the fixed blocks (128). End face gears (132) are arranged on one side of the fixed blocks (128).

4. The mechanical experimental trolley according to claim 3, characterized in that: On the upper parts of the front and rear ends of the fixed plate (123), endless toothed belts (126) are provided. On both inner sides of the endless toothed belts (126), transmission shafts (131) are provided. On one side of the middle part of the outer circumference of one of the transmission shafts (131), a driven bevel gear (138) is fixedly connected. On one side of the driven bevel gear (138), a driving bevel gear (134) is meshed and connected. The driving bevel gear (134) is fixedly connected to the outer end of the circumference of a rotating shaft (130). One end of the rotating shaft (130) far from the driving bevel gear (134) is fixedly connected to the driving end of a servo motor (129).

5. A mechanical experimental trolley according to claim 1, characterized in that: On one side of the middle part inside the housing (109), a control main board (114) is installed. On one side of the bottom of the control main board (114), a plurality of data interfaces are provided. The data interfaces all penetrate through the middle part of one end of the housing (109). The control main board (114) is electrically connected to a control box (101).

6. The mechanical experimental trolley according to claim 5, characterized in that: On the inner bottom of the housing (109), a wireless charging module (119) is installed. The wireless charging module (119) is arranged directly above a wireless charging area (112). The wireless charging module (119) is electrically connected to the control main board (114). On the inner edge of the housing (109), a plurality of sensors are installed.

7. A mechanical experiment trolley according to claim 3, characterized in that: The face gears (132) are all meshed and connected to one side of a toothed ring (136). The face gears (132) are all rotatably connected to the outside of a limit block (135). The limit blocks (135) are all fixedly connected to both sides of the front and rear parts of a slider (139). On the upper middle parts of the front and rear ends of the slider (139), electric push rods (137) are rotatably connected.

8. A mechanical experimental trolley according to claim 7, characterized in that: On the outer circumferences of the electric push rods (137), driven gears (140) are fixedly connected. The driven gears (140) are all meshed and connected to the bottom of the endless toothed belts (126). On the telescopic ends of the electric push rods (137), tooth columns (133) are fixedly connected.

9. The mechanical experimental trolley according to claim 4, characterized in that: One end of the rotating shaft (130) far from the driving bevel gear (134) penetrates through one side wall of the housing (109). The servo motor (129) is installed in the upper middle part of one end of the housing (109). The driving bevel gear (134) and the driven bevel gear (138) are both arranged inside the fixed plate (123).

10. A mechanical experimental trolley according to claim 6, characterized in that: The wireless charging module (119) is arranged below a liquid storage bin (118). The wireless charging module (119) is arranged below the control main board (114).

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