CN114813194B - Double-roller adjustable alfalfa modulation test device and method - Google Patents

Abstract

The invention belongs to the technical field of pasture machinery, and particularly relates to a double-roller adjustable alfalfa modulation test device and method. The device comprises a rack, an upper flattening roller, a second screw hole uct bearing, a second belt transmission system, a second planet plate, a second uct bearing, a second lead screw elevator, a second pressure sensor, a second pressure measuring bar, a second hydraulic cylinder, a lower flattening roller, a first hydraulic cylinder, a first planet plate, a first pressure measuring bar, a first pressure sensor, a first lead screw elevator, a first uct bearing, a data acquisition controller, a frequency converter, a frequency conversion motor, a first coupler, a torque sensor, a second coupler, a chain transmission system, a first belt transmission system and a first screw hole uct bearing; the device can change the angle and the distance between the upper and lower flattening rollers, change the rotating speed of the flattening rollers, realize the separation of the upper and lower flattening rollers when foreign matters possibly meet in the real operation process, and measure the pressing force, the rotating speed and the torque between the rollers in the alfalfa modulation process in real time.

Description

A kind of roller adjustable alfalfa preparation test device and method

technical field

The invention belongs to the technical field of forage machinery, and in particular relates to a roller-adjustable alfalfa preparation test device and method.

Background technique

Modulation treatment can effectively increase the dehydration rate of alfalfa in the field, reduce the problem of leaf shedding caused by the asynchronous drying rate of stems and leaves during the alfalfa tedding process, and improve the quality of alfalfa. Working parameters such as speed, gap, and angle of the upper and lower crushing rollers, structural parameters such as the radius of the crushing roller and the shape of the roll pattern, and material parameters such as feeding amount and alfalfa length have important influences on the modulation effect and equipment energy consumption. By designing the alfalfa brewing test device to carry out the brewing test research, the uncertainty brought about by the complex field operation environment can be avoided, the influence of the above parameters on the brewing quality and energy consumption can be effectively analyzed, and the design and optimization of the brewing mechanism can be used to improve the quality of alfalfa brewing. has important meaning.

Contents of the invention

In order to overcome the deficiencies of the existing test devices, the present invention provides a device that can change the angle and distance between the upper and lower crushing rollers, change the speed of the crushing rollers, and realize the separation of the upper and lower crushing rollers when foreign objects may be encountered in the simulated real operation process, and can The invention relates to an adjustable alfalfa brewing test device and method for real-time measurement of the pressing force, rotating speed and torque between the rollers during the brewing process of alfalfa.

In order to achieve the above object, the present invention provides the following technical solutions:

An alfalfa brewing test device with adjustable pair of rollers, the device includes a frame 1, an upper flattening roller 2, a second UCT bearing with screw holes 3, a second belt transmission system 4, a second planetary plate 5, a second uct bearing 6, second lead screw lifter 7, second pressure sensor 8, second pressure measuring bar 9, second hydraulic cylinder 10, lower flattening roller 11, first hydraulic cylinder 12, first planetary plate 13, first Pressure measuring bar 14, first pressure sensor 15, first screw lifter 16, first uct bearing 17, data acquisition controller 18, frequency converter 19, frequency conversion motor 20, first coupling 21, torque sensor 22, the first Two shaft couplings 23, a chain drive system 24, a first belt drive system 25 and a first uct bearing 26 with screw holes;

The left and right sides of the frame 1 are respectively fixed with an upper transverse beam and a lower transverse beam, and the lower parts of the lower transverse beams on the left and right sides are respectively fixed with a vertical beam;

The first uct bearing 17 and the second uct bearing 6 are connected to the two vertical beams on the left and right sides of the frame 1, and the screw knobs of the first uct bearing 17 and the second uct bearing 6 point to the first screw lift respectively 16 and the second lead screw elevator 7 and parallel to the vertical beam of the frame, the lower crushing roller 11 is installed between the first uct bearing 17 and the second uct bearing 6 in the form of a rotating pair, by adjusting the first uct bearing 17 and the lead screw on the second uct bearing 6 make the bearing slide in the guide groove, and realize that the lower crushing roller 11 moves toward or away from the first lead screw lifter 16 and the second lead screw lifter 7 in the horizontal direction;

The upper crushing roller 2 is installed between the first planetary plate 13 and the second planetary plate 5 in the form of a rotating pair through bearings;

The first planetary plate 13 is provided with a first screw hole 13-1 of the first planetary plate, and the first screw hole 13-1 of the first planetary plate is connected with the first belt of the upper transverse beam fixed on the left side of the frame 1. The screw hole 26-1 of the screw hole uct bearing 26 is aligned to form a rotating pair; the second planetary plate 5 is provided with the first screw hole of the second planetary plate, and the first screw hole of the second planetary plate is fixed on the frame 1 The screw holes of the second UCT bearing 3 with screw holes on the upper transverse beam on the right are aligned to form a rotating pair;

One end of the first hydraulic cylinder 12 is fixedly connected on the upper transverse beam of the frame 1, and the other end is fixedly connected with the first planetary plate 13 by bolts; On the upper transverse beam, the other end is fixedly connected with the second planetary plate 5 by bolts;

By adjusting the leading screw on the first band screw hole uct bearing 26 and the second band screw hole uct bearing 3 and changing the elongation of the first hydraulic cylinder 12 and the second hydraulic cylinder 10, the first planetary plate 13 and the second hydraulic cylinder 10 can be changed. The height of the two planetary plates 5, and then realize the adjustment of the distance between the flattening rollers;

The chain drive system 24 includes a first sprocket 24-1, a chain 24-2, a tensioning pulley 24-3, a second sprocket 24-4 and a third sprocket 24-5, wherein the first sprocket 24-1 is fixed Connected to the shaft of the lower crushing roller 11; the tensioning wheel 24-3 is fixedly installed on the upper transverse beam on the left side of the frame 1, and plays a tensioning role through the spring; the second sprocket 24-4 is fixedly installed on the first On the uct bearing 26 with the screw hole, the screw knob of the first uct bearing with the screw hole 26 is fixedly installed downward on the upper transverse beam of the frame, by adjusting the screw knob of the uct bearing 26 with the first screw hole, the second The sprocket 24-4 can move vertically; the third sprocket 24-5 is fixedly mounted on the upper transverse beam on the left side of the frame 1; the chain 24-2 goes around the first sprocket 24-1, tensioned Wheel 24-3, second sprocket 24-4, and third sprocket 24-5, wherein the first sprocket 24-1, tensioning pulley 24-3, and third sprocket 24-5 rotate in a first direction , the second sprocket 24-4 rotates in the second direction opposite to the first direction, and plays the role of transmission and changing the rotation speed direction of the upper and lower crushing rollers, so that the upper and lower crushing rollers can rotate in opposite directions;

The variable frequency motor 20 is connected to the frequency converter 19 through wires, and the speed of the variable frequency motor 20 can be adjusted steplessly. The power output end of the variable frequency motor 20 is connected to the torque sensor 22 through the first shaft coupling 21, and the other torque sensor 22 One end is connected with the first sprocket 24-1 through the second shaft coupling 23 to provide power for the chain transmission system 24, and the torque sensor 22 is connected with the data acquisition controller 18 through a wire, and can record torque parameters in real time;

The first belt transmission system 25 includes a first pulley 25-1, a first belt 25-2 and a second pulley 25-3, wherein the first pulley 25-1 and the second sprocket 24-4 are coaxially fixed on the On the first uct bearing 26 with screw holes, the second pulley 25-3 is fixedly connected to the shaft of the upper crushing roller 2, and the first pulley 25-1 and the second pulley 25-3 are connected by the first belt 25-2 , by changing the size of the first sprocket 24-1 and the second pulley 25-3 to realize the same speed or differential rotation of the upper and lower crushing rollers;

The second belt drive system 4 includes a third pulley 4-1, a second belt 4-2 and a fourth pulley 4-3, wherein the third pulley 4-1 is fixedly mounted on the second uct bearing 3 with screw holes , the fourth pulley 4-3 is fixedly connected on the shaft of the upper crushing roller 2, and the third pulley 4-1 and the fourth pulley 4-3 are connected through the second belt 4-2;

The first planetary plate 13 and the second planetary plate 5 are fixedly connected with the first pressure measuring bar 14 and the second pressure measuring bar 9 respectively, and the first lead screw lifter is fixed on the lower transverse beams on the left and right sides of the frame 1 16 and the second screw lift 7, the first pressure sensor 15 and the second pressure sensor 8 are respectively installed on the first screw lift 16 and the second screw lift 7, the first pressure sensor 15 and the second pressure sensor The sensor 8 is connected with the data acquisition controller 18 through wires.

A kind of method that utilizes as described roller adjustable alfalfa preparation test device to carry out alfalfa preparation test, described method comprises the steps:

1) Determine and install the size of the sprocket and pulley according to the test requirements, adjust the lead screws on the first uct bearing 26 with screw holes and the second uct bearing 3 with screw holes and change the first hydraulic cylinder 12 and the second hydraulic cylinder 10 The amount of elongation is to determine the distance between the upper crushing roller 2 and the lower crushing roller 11, after adjustment, ensure that the first pressure measuring bar 14 and the first pressure sensor 15 and the second pressure measuring bar 9 and the second pressure sensor 8 are in the be consistent vertically;

Adjust the leading screw on the first uct bearing 17 and the second uct bearing 4, change the position of the lower crushing roller 11 in the horizontal direction, and adjust the angle between the upper crushing roller 2 and the lower crushing roller 11;

2) Turn on the frequency conversion motor 20, and make the upper crushing roller 2 and the lower crushing roller 11 reach a predetermined speed by adjusting the frequency converter 19;

3) Open the data acquisition controller 18, adjust the leading screw height of the first leading screw elevator 16 and the second leading screw elevator 7, so that the first pressure sensor 15 and the second pressure sensor 8 are respectively connected to the first pressure measuring rod 14 and the second pressure measuring rod 14. The two pressure measuring bars 9 squeeze each other, so that the pressure value collected by the data acquisition controller 18 exceeds a certain preset value X, and after the value is stable, feed the alfalfa;

4) When the feeding amount is too large or there is foreign matter and the values collected by the first pressure sensor 15 and the second pressure sensor 8 are smaller than another preset value Y, the data acquisition controller 18 controls the first hydraulic cylinder 12 And the second hydraulic cylinder 10 contracts, so that the first side planetary plate 13 and the second planetary plate 5 rotate counterclockwise around the first uct bearing 26 with screw holes and the second uct bearing 3 with screw holes, and lift the upper crushing roller 2 , realize the separation of the upper crushing roller 2 and the lower crushing roller 11; after the foreign matter passes through, realize the reset of the upper crushing roller 2 by making the first hydraulic cylinder 12 and the second hydraulic cylinder 10 reach the initial elongation.

In step 3), when it is necessary to adjust the distance or angle between the rollers, before performing the second test, it is necessary to lower the lead screw heights of the first lead screw lifter 16 and the second lead screw lifter 7 to prevent the first pressure sensor 15 and the second pressure sensor Sensor 8 is damaged.

Compared with prior art, the beneficial effect of the present invention is:

The invention can change the angle and distance between the upper and lower flattening rollers, change the rotation speed of the flattening rollers, realize the separation of the upper and lower flattening rollers when foreign matter may be encountered in the simulated real operation process, and can measure the pressing force between the rollers in the process of alfalfa preparation in real time , speed, torque.

Description of drawings

Fig. 1 is the structural representation of roller adjustable alfalfa modulation test device of the present invention;

Fig. 2 is the right side view of the roll-adjustable alfalfa modulation test device of the present invention;

Fig. 3 is the left side view of roller adjustable alfalfa modulation test device of the present invention;

Fig. 4 is the schematic diagram of planet plate;

Figure 5 is a schematic diagram of a uct bearing with a screw hole.

The reference signs therein are:

1. Rack 2. Upper flattening roller

3. The second UCT bearing with screw hole 4. The second belt drive system

4-1, the third pulley 4-2, the second belt

4-3. The fourth pulley 5. The second planetary plate

6. The second uct bearing 7. The second screw lift

8. The second pressure sensor 9. The second pressure measuring bar

10. Second hydraulic cylinder 11. Lower flattening roller

12. The first hydraulic cylinder 13. The first planetary plate

13-1. The first screw hole of the first planetary plate 13-2. The central shaft hole of the planetary plate

13-3. The second screw hole of the first planetary plate 14. The first pressure measuring bar

15. The first pressure sensor 16. The first screw lifter

17. The first uct bearing

18. Data acquisition controller 19. Inverter

20. Frequency conversion motor 21. First shaft coupling

22. Torque sensor 23. Second shaft coupling

24. Chain drive system 24-1. The first sprocket

24-2, chain 24-3, tensioner

24-4, second sprocket 24-5, third sprocket

25. The first belt drive system 25-1. The first pulley

25-2, the first belt 25-3, the second pulley

26. The first uct bearing with screw hole 26-1. Screw hole

detailed description

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 3, the roller adjustable alfalfa preparation test device includes a frame 1, an upper flattening roller 2, a second uct bearing with screw holes 3, a second belt transmission system 4, a second planetary Plate 5, second uct bearing 6, second screw lifter 7, second pressure sensor 8, second pressure measuring bar 9, second hydraulic cylinder 10, lower flattening roller 11, first hydraulic cylinder 12, first planet Plate 13, first pressure measuring bar 14, first pressure sensor 15, first screw lifter 16, first uct bearing 17, data acquisition controller 18, frequency converter 19, frequency conversion motor 20, first coupling 21, Torque sensor 22 , second shaft coupling 23 , chain drive system 24 , first belt drive system 25 and first uct bearing with screw hole 26 .

An upper transverse beam and a lower transverse beam are fixedly connected to the left and right sides of the frame 1 respectively, and vertical beams are fixedly connected to the lower parts of the lower transverse beams on the left and right sides respectively.

The first uct bearing 17 and the second uct bearing 6 are connected to the two vertical beams on the left and right sides of the frame 1, and the screw knobs of the first uct bearing 17 and the second uct bearing 6 point to the first screw lift respectively 16 and the second lead screw elevator 7 and parallel to the vertical beam of the frame, the lower crushing roller 11 is installed between the first uct bearing 17 and the second uct bearing 6 in the form of a rotating pair, by adjusting the first uct bearing 17 and the lead screw on the second uct bearing 6 make the bearing slide in the guide groove, so that the lower crushing roller 11 can move toward or away from the first lead screw lifter 16 and the second lead screw lifter 7 in the horizontal direction.

The upper crushing roller 2 is installed between the first planetary plate 13 and the second planetary plate 5 in the form of a rotating pair through bearings.

As shown in Figure 4, the first planetary plate 13 is provided with a first screw hole 13-1 of the first planetary plate, and the first screw hole 13-1 of the first planetary plate is fixed on the upper side of the left side of the frame 1. The screw holes 26-1 of the first UCT bearing 26 with screw holes of the transverse beam are aligned to form a rotating pair. Similarly, the second planetary plate 5 is provided with the first screw hole of the second planetary plate, and the first screw hole of the second planetary plate is connected with the second threaded hole uct of the upper transverse beam fixed on the right side of the frame 1. The screw holes of the bearing 3 are aligned to form a revolving pair.

One end of the first hydraulic cylinder 12 is fixedly connected on the upper transverse beam of the frame 1, and the other end is fixedly connected with the first planetary plate 13 by bolts; On the upper transverse beam, the other end is fixedly connected with the second planetary plate 5 by bolts.

By adjusting the leading screw on the first band screw hole uct bearing 26 and the second band screw hole uct bearing 3 and changing the elongation of the first hydraulic cylinder 12 and the second hydraulic cylinder 10, the first planetary plate 13 and the second hydraulic cylinder 10 can be changed. The height of the two planetary plates 5, and then realize the adjustment of the distance between the crushing rollers.

As shown in Figures 2 and 3, the chain transmission system 24 includes a first sprocket 24-1, a chain 24-2, a tensioning pulley 24-3, a second sprocket 24-4 and a third sprocket 24-5, Wherein the first sprocket 24-1 is fixedly connected on the shaft of the lower crushing roller 11; the tensioning wheel 24-3 is fixedly installed on the upper transverse beam on the left side of the frame 1, and plays a tensioning role through the spring; the second chain The wheel 24-4 is fixedly installed on the first uct bearing 26 with screw holes, and the screw knob of the first uct bearing 26 with screw holes is fixedly installed downward on the upper transverse beam of the frame. By adjusting the first uct bearing with screw holes The screw knob of the bearing 26, the second sprocket 24-4 can move in the vertical direction; the third sprocket 24-5 is fixedly installed at the upper transverse beam place on the left side of the frame 1; the chain 24-2 walks around the first A sprocket 24-1, tension pulley 24-3, second sprocket 24-4 and third sprocket 24-5, wherein the first sprocket 24-1, tension pulley 24-3 and the third chain The wheel 24-5 rotates in the first direction, and the second sprocket 24-4 rotates in the second direction opposite to the first direction, which plays the role of transmission and changing the rotation speed direction of the upper and lower crushing rollers, so that the upper and lower crushing rollers can face each other turn.

The variable frequency motor 20 is connected to the frequency converter 19 through wires, and the speed of the variable frequency motor 20 can be adjusted steplessly. One end is connected to the first sprocket 24-1 through the second coupling 23 to provide power for the chain transmission system 24, and the torque sensor 22 is connected to the data acquisition controller 18 through wires, and can record torque parameters in real time.

As shown in Figure 3, the first belt drive system 25 includes a first pulley 25-1, a first belt 25-2 and a second pulley 25-3, wherein the first pulley 25-1 and the second sprocket 24- 4 The coaxial is fixedly installed on the first uct bearing 26 with screw holes, the second pulley 25-3 is fixedly connected on the shaft of the upper crushing roller 2, and the first pulley 25-1 and the second pulley 25-3 pass through the first A belt 25-2 is connected, and by changing the size of the first sprocket 24-1 and the second pulley 25-3, the upper and lower crushing rollers can be rotated at the same speed or at a different speed.

As shown in Figure 2, the second belt drive system 4 includes a third pulley 4-1, a second belt 4-2 and a fourth pulley 4-3, wherein the third pulley 4-1 is fixedly mounted on the second belt On the screw hole uct bearing 3, the fourth pulley 4-3 is fixedly connected on the shaft of the upper crushing roller 2, and the third pulley 4-1 and the fourth pulley 4-3 are connected through the second belt 4-2.

As shown in Figure 4, the first planetary plate 13 and the second planetary plate 5 are fixedly connected with the first pressure measuring bar 14 and the second pressure measuring bar 9 respectively, and the lower transverse beams on the left and right sides of the frame 1 are fixed A first leading screw lift 16 and a second leading screw lift 7 are arranged, and a first pressure sensor 15 and a second pressure sensor 8 are respectively installed on the first leading screw lift 16 and the second leading screw lift 7, and the first pressure sensor 15 and the second pressure sensor 8 are respectively installed. The sensor 15 and the second pressure sensor 8 are connected with the data acquisition controller 18 through wires.

Working process of the present invention is:

During work, at first determine the upper and lower roller spacing by adjusting the height of the first UCT bearing 26 with screw holes and the second UCT bearing 3 with screw holes, the elongation of the first hydraulic cylinder 12 and the second hydraulic cylinder 10, and turn on the frequency conversion motor 20 Provide power, make the first load cell 14, the second load cell 9 and the first pressure sensor 15 and the second pressure sensor 8 squeeze each other by adjusting the screw height of the first screw lifter 16 and the second screw lifter 7 After the numerical values of the first pressure sensor 15 and the second pressure sensor 8 are stable, the alfalfa modulation test is carried out.

During the modulation process, the change of the pressing force between the rollers is collected in real time through the data acquisition controller 18 . The data acquisition controller 18 is also connected with the first hydraulic cylinder 12 and the second hydraulic cylinder 10 by wires, and when the pressure collected by the first pressure sensor 15 and the second pressure sensor 8 is less than a given threshold, the data acquisition controller 18 controls The first hydraulic cylinder 12 and the second hydraulic cylinder 10 contract to lift the upper crushing roller 2 to realize the separation of the upper and lower crushing rollers to avoid foreign matter. After the foreign matter passes through, the first hydraulic cylinder 12 and the second hydraulic cylinder 10 extend to The preset position realizes the reset of the upper flattening roller 2.

A kind of method that utilizes roller adjustable alfalfa preparation test device to carry out alfalfa preparation test, comprises the steps:

1. Determine and install the size of the sprocket and pulley according to the test requirements, adjust the screw on the first uct bearing 26 with screw holes and the second uct bearing 3 with screw holes, and change the first hydraulic cylinder 12 and the second hydraulic cylinder 10 The amount of elongation is to determine the distance between the upper crushing roller 2 and the lower crushing roller 11, after adjustment, ensure that the first pressure measuring bar 14 and the first pressure sensor 15 and the second pressure measuring bar 9 and the second pressure sensor 8 are in the Be consistent vertically.

Adjust the lead screw on the first uct bearing 17 and the second uct bearing 4, change the position of the lower crushing roller 11 in the horizontal direction, and adjust the angle between the upper crushing roller 2 and the lower crushing roller 11.

2. Turn on the frequency conversion motor 20, and adjust the frequency converter 19 to make the upper crushing roller 2 and the lower crushing roller 11 reach a predetermined speed.

3. Open the data acquisition controller 18, adjust the lead screw height of the first screw lifter 16 and the second screw lifter 7, so that the first pressure sensor 15 and the second pressure sensor 8 are respectively connected to the first pressure measuring rod 14 and the second pressure sensor The two pressure measuring bars 9 squeeze each other, so that the pressure value collected by the data acquisition controller 18 exceeds a certain preset value X, and the alfalfa is fed after the value stabilizes.

After the alfalfa is fed, the pressure value collected by the data acquisition controller 18 will be reduced to the value X ₂ , and the force on the alfalfa is F=XX ₂ . It needs to be explained that X ₂ is not a certain value. The force received will also vary. At the same time, the preset value X should not be too small, and the value should not be 0 during the data collection process. When it is necessary to adjust the distance or angle between the rollers, before carrying out the second test, it is necessary to lower the screw heights of the first screw lifter 16 and the second screw lifter 7 to prevent the first pressure sensor 15 and the second pressure sensor 8 from being damaged.

4. When the feeding amount is too large or there is foreign matter, so that the values collected by the first pressure sensor 15 and the second pressure sensor 8 are less than another preset value Y, the data acquisition controller 18 controls the first hydraulic cylinder 12 And the second hydraulic cylinder 10 contracts, so that the first side planetary plate 13 and the second planetary plate 5 rotate counterclockwise around the first uct bearing 26 with screw holes and the second uct bearing 3 with screw holes, and lift the upper crushing roller 2 , realize the separation of the upper crushing roller 2 and the lower crushing roller 11; after the foreign matter passes through, realize the reset of the upper crushing roller 2 by making the first hydraulic cylinder 12 and the second hydraulic cylinder 10 reach the initial elongation.

Claims (3)

1. The utility model provides an alfalfa modulation test device with adjustable pair roller which characterized in that: the device comprises a rack (1), an upper flattening roller (2), a second bearing (3) with a screw hole uct, a second belt transmission system (4), a second planet plate (5), a second uct bearing (6), a second lead screw elevator (7), a second pressure sensor (8), a second pressure measuring bar (9), a second hydraulic cylinder (10), a lower flattening roller (11), a first hydraulic cylinder (12), a first planet plate (13), a first pressure measuring bar (14), a first pressure sensor (15), a first lead screw elevator (16), a first uct bearing (17), a data acquisition controller (18), a frequency converter (19), a frequency conversion motor (20), a first coupler (21), a torque sensor (22), a second coupler (23), a chain transmission system (24), a first belt transmission system (25) and a first bearing uct bearing (26);

the left side and the right side of the rack (1) are respectively fixedly connected with an upper transverse beam and a lower transverse beam, and the lower parts of the lower transverse beams on the left side and the right side are respectively fixedly connected with a vertical beam;

a first uct bearing (17) and a second uct bearing (6) are connected with two vertical beams on the left side and the right side of the rack (1), screw knobs of the first uct bearing (17) and the second uct bearing (6) are respectively directed to a first screw elevator (16) and a second screw elevator (7) and are parallel to the vertical beams of the rack, the lower flattening roller (11) is installed between the first uct bearing (17) and the second uct bearing (6) in a rotating pair mode, and the bearings slide in the guide grooves by adjusting screw rods on the first uct bearing (17) and the second uct bearing (6), so that the lower flattening roller (11) moves towards or away from the first screw elevator (16) and the second screw elevator (7) in the horizontal direction;

the upper flattening roller (2) is arranged between the first planetary plate (13) and the second planetary plate (5) in a rotating pair mode through a bearing;

the first planet plate (13) is provided with a first planet plate first screw hole (13-1), and the first planet plate first screw hole (13-1) is aligned with a screw hole (26-1) of a first belt screw hole uct bearing (26) of an upper transverse beam fixed on the left side of the rack (1) to form a revolute pair; the second planet plate (5) is provided with a first screw hole of the second planet plate, and the first screw hole of the second planet plate is aligned with a screw hole of a second bearing (3) with a screw hole uct and fixed on an upper transverse beam on the right side of the rack (1) to form a revolute pair;

one end of the first hydraulic cylinder (12) is fixedly connected to an upper transverse beam of the rack (1), and the other end of the first hydraulic cylinder is fixedly connected with the first planet plate (13) through a bolt; one end of the second hydraulic cylinder (10) is fixedly connected to an upper transverse beam of the rack (1), and the other end of the second hydraulic cylinder is fixedly connected with the second planet plate (5) through a bolt;

the heights of the first planetary plate (13) and the second planetary plate (5) can be changed by adjusting screw rods on a first screw hole uct bearing (26) and a second screw hole uct bearing (3) and changing the elongation of a first hydraulic cylinder (12) and a second hydraulic cylinder (10), so that the adjustment of the distance between the flattening rollers is realized;

the chain transmission system (24) comprises a first chain wheel (24-1), a chain (24-2), a tension wheel (24-3), a second chain wheel (24-4) and a third chain wheel (24-5), wherein the first chain wheel (24-1) is fixedly connected to the shaft of the lower pinch roll (11); the tensioning wheel (24-3) is fixedly arranged at the upper transverse beam on the left side of the rack (1) and plays a tensioning role through a spring; the second chain wheel (24-4) is fixedly arranged on a first belt screw hole uct bearing (26), a screw rod knob of the first belt screw hole uct bearing (26) is downwards fixedly arranged on an upper transverse beam of the rack, and the second chain wheel (24-4) can move in the vertical direction by adjusting the screw rod knob of the first belt screw hole uct bearing (26); the third chain wheel (24-5) is fixedly arranged at the upper transverse beam on the left side of the rack (1); the chain (24-2) rounds a first chain wheel (24-1), a tension wheel (24-3), a second chain wheel (24-4) and a third chain wheel (24-5), wherein the first chain wheel (24-1), the tension wheel (24-3) and the third chain wheel (24-5) rotate along a first direction, the second chain wheel (24-4) rotates along a second direction opposite to the first direction, the functions of driving and changing the rotating speed direction of the upper and lower crushing rollers are achieved, and the upper and lower crushing rollers can rotate oppositely;

the variable frequency motor (20) is connected with the frequency converter (19) through a lead, the rotating speed of the variable frequency motor (20) can be adjusted in a stepless mode, the power output end of the variable frequency motor (20) is connected with the torque sensor (22) through the first coupler (21), the other end of the torque sensor (22) is connected with the first chain wheel (24-1) through the second coupler (23) to provide power for the chain transmission system (24), and the torque sensor (22) is connected with the data acquisition controller (18) through a lead and can record torque parameters in real time;

the first belt transmission system (25) comprises a first belt pulley (25-1), a first belt (25-2) and a second belt pulley (25-3), wherein the first belt pulley (25-1) and a second chain wheel (24-4) are coaxially and fixedly installed on a first belt screw hole uct bearing (26), the second belt pulley (25-3) is fixedly connected to the shaft of the upper flattening roller (2), the first belt pulley (25-1) and the second belt pulley (25-3) are connected through the first belt (25-2), and the upper flattening roller and the lower flattening roller rotate at the same speed or at different speeds by changing the sizes of the first belt pulley (24-1) and the second belt pulley (25-3);

the second belt transmission system (4) comprises a third belt pulley (4-1), a second belt (4-2) and a fourth belt pulley (4-3), wherein the third belt pulley (4-1) is fixedly installed on a second belt screw hole uct bearing (3), the fourth belt pulley (4-3) is fixedly connected to a shaft of the upper flattening roller (2), and the third belt pulley (4-1) is connected with the fourth belt pulley (4-3) through the second belt (4-2);

first planet board (13) and second planet board (5) rigid coupling respectively have first pressure bar (14) and second pressure bar (9), be fixed with first lead screw lift (16) and second lead screw lift (7) on the horizontal roof beam of both sides below about frame (1), install first pressure sensor (15) and second pressure sensor (8) on first lead screw lift (16) and second lead screw lift (7) respectively, first pressure sensor (15) and second pressure sensor (8) are connected with data acquisition controller (18) through the wire.

2. A method for performing a alfalfa modulation test using the roll-adjustable alfalfa modulation test apparatus of claim 1, characterized in that: the method comprises the following steps:

1) Determining the sizes of a chain wheel and a belt pulley according to test requirements and installing the chain wheel and the belt pulley, adjusting lead screws on a first belt screw hole uct bearing (26) and a second belt screw hole uct bearing (3) and changing the elongation of a first hydraulic cylinder (12) and a second hydraulic cylinder (10), determining the distance between an upper flattening roller (2) and a lower flattening roller (11), and ensuring that a first pressure measuring bar (14) and a first pressure sensor (15) and a second pressure measuring bar (9) and a second pressure sensor (8) are kept consistent in the vertical direction after adjustment;

adjusting lead screws on a first uct bearing (17) and a second uct bearing (4), changing the position of the lower flattening roller (11) in the horizontal direction, and adjusting the angle between the upper flattening roller (2) and the lower flattening roller (11);

2) Turning on a variable frequency motor (20), and adjusting a frequency converter (19) to enable an upper flattening roller (2) and a lower flattening roller (11) to reach a preset rotating speed;

3) Starting a data acquisition controller (18), adjusting the screw heights of a first screw lifter (16) and a second screw lifter (7), enabling a first pressure sensor (15) and a second pressure sensor (8) to respectively extrude a first pressure measuring bar (14) and a second pressure measuring bar (9) mutually, enabling the pressure value collected by the data acquisition controller (18) to exceed a certain preset value X, and feeding alfalfa after the value is stable;

4) When the feeding amount is too large or foreign matters exist, the numerical values collected by the first pressure sensor (15) and the second pressure sensor (8) are smaller than another preset value Y, the data acquisition controller (18) controls the first hydraulic cylinder (12) and the second hydraulic cylinder (10) to contract, so that the first side planet plate (13) and the second planet plate (5) rotate anticlockwise around the first screw hole uct bearing (26) and the second screw hole uct bearing (3), the upper flattening roller (2) is lifted, and the upper flattening roller (2) and the lower flattening roller (11) are separated; after the foreign matters pass through, the upper flattening roller (2) is reset by enabling the first hydraulic cylinder (12) and the second hydraulic cylinder (10) to reach the initial elongation.

3. The method of claim 2, wherein: in the step 3), when the distance or the angle between the rollers needs to be adjusted, the lead screw heights of the first lead screw lifter (16) and the second lead screw lifter (7) need to be lowered before the secondary test is carried out, and the first pressure sensor (15) and the second pressure sensor (8) are prevented from being damaged.

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