CN216670982U - Device for demonstrating physical friction force - Google Patents

Abstract

The utility model provides a device for demonstrating physical friction force. The device for demonstrating physical friction force comprises a base plate, the top fixed mounting of bottom plate has two risers, two fixed mounting has same backup pad on the one side outer wall that the riser is close to each other, rotate in the backup pad and install the line wheel, keep away from the line wheel fixed mounting has electric putter on the riser, just electric putter is located the below of backup pad, take turns to around being equipped with the pull wire, the bottom of pull wire with electric putter's output shaft fixed connection, the top of backup pad is provided with the sliding block, fixed mounting has the digital display tensiometer on the sliding block, the top of pull wire with the couple fixed connection of digital display tensiometer. The device for demonstrating the physical friction force provided by the utility model has the advantages of being capable of demonstrating more factors influencing the friction force, facilitating reading and being beneficial to smooth demonstration.

Description

Device for demonstrating physical friction force

Technical Field

The utility model relates to the technical field of physical demonstration, in particular to a device for demonstrating physical friction force.

Background

The friction force is related to objects which rub against each other, when two objects which are contacted with each other and pressed are in relative motion or have relative motion trends, the friction force which hinders the relative motion or the relative motion trends is generated on the contact surface, and in physical teaching, students can better understand knowledge points about the friction force through the friction force demonstration device.

However, traditional physics frictional force presentation device is when using, and it is less to demonstrate the factor that influences frictional force, and it is usually that the manual animal body that draws of people moves, causes the object to move easily and suddenly slow, causes the reading difficulty to increase pressure through the mode that increases the weight usually, the object moves suddenly and leads to the weight to drop midway easily, causes the demonstration to break, and the weight is also forgotten to carry by the teacher easily in addition.

Therefore, there is a need to provide a new demonstration device for physical friction force to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model solves the technical problem of providing a physical friction force demonstration device which can demonstrate more factors influencing the friction force, is convenient for reading and is beneficial to smooth demonstration.

In order to solve the technical problems, the device for demonstrating the physical friction force comprises a bottom plate, wherein two vertical plates are fixedly arranged at the top of the bottom plate, a same supporting plate is fixedly arranged on the outer wall of one side, close to each other, of the two vertical plates, a wire wheel is rotatably arranged on the supporting plate, an electric push rod is fixedly arranged on the vertical plate far away from the wire wheel and is positioned below the supporting plate, a traction wire is wound on the wire wheel, the bottom end of the traction wire is fixedly connected with an output shaft of the electric push rod, a sliding block is arranged at the top of the supporting plate, a digital display tensiometer is fixedly arranged on the sliding block, the top end of the traction wire is fixedly connected with a hook of the digital display tensiometer, a plurality of friction plates are fixedly arranged on the supporting plate, two supporting sliding rods positioned above the supporting plate are fixedly arranged on the outer wall of one side, close to each other, of the two vertical plates, two slidable mounting has same removal seat on the support slide bar, slidable mounting has two first direction slide bars, two on the removal seat the bottom fixed mounting of first direction slide bar has same installation piece, the bottom fixed mounting of installation piece has the inserted block, remove the seat and go up the screw thread and install adjusting screw, adjusting screw's bottom is rotated and is installed and drive the piece, two first direction slide bar all runs through drive the piece and with drive a sliding connection, the bottom fixed mounting of drive piece has the spring, the bottom of spring with installation piece fixed connection, the slot has been seted up at the top of sliding block.

Preferably, the top of the supporting plate is provided with a wire passing port, the wire wheel is rotatably arranged on the inner walls of two sides of the wire passing port, and the traction wire penetrates through the wire passing port and is movably connected with the inner wall of the wire passing port.

Preferably, two fixing holes are formed in the moving seat, linear bearings are fixedly mounted in the two fixing holes, and the two supporting sliding rods penetrate through the corresponding linear bearings and are in sliding connection with the inner walls of the corresponding linear bearings.

Preferably, the top of the movable seat is fixedly provided with a graduated scale, the top end of the adjusting screw is fixedly provided with a first knob, and the first knob is fixedly provided with a pointer.

Preferably, a first fixing groove is formed in the top of the driving block, the bottom end of the adjusting screw extends into the first fixing groove and is fixedly sleeved with a first bearing, and an outer ring of the first bearing is fixedly connected with the inner wall of the first fixing groove.

Preferably, the sliding block is close to fixed mounting has the installing frame on the outer wall of one side of line wheel, the digital display tensiometer is located in the installing frame, threaded mounting has locking screw on the top inner wall of installing frame, locking screw's bottom is rotated the cover and is equipped with the clamp plate, slidable mounting has two second direction slide bars on the top inner wall of installing frame, two the bottom of second direction slide bar all with clamp plate fixed connection, homoenergetic fixed mounting has the slipmat on the bottom of clamp plate and the bottom inner wall of installing frame, two the slipmat all with the digital display tensiometer contacts.

Preferably, a second fixing groove is formed in the top of the pressing plate, the bottom end of the adjusting screw rod extends into the second fixing groove and is fixedly sleeved with a second bearing, the outer ring of the second bearing is fixedly connected with the inner wall of the second fixing groove, and a second knob is fixedly mounted at the top end of the adjusting screw rod.

Compared with the related art, the device for demonstrating the physical friction force provided by the utility model has the following beneficial effects:

the utility model provides a device for demonstrating physical friction force, which can demonstrate the influence of the roughness of the contact surface of an object on the friction force by arranging a supporting plate, a wire wheel, an electric push rod, a traction wire, a sliding block, a digital display tension meter and three friction plates, wherein the electric push rod can pull the traction wire, so that the sliding block can move uniformly, and the numerical value on the digital display tension meter can be read conveniently; through two support slide bars, remove the setting of seat, two first direction slide bars, installation piece, inserted block, spring, adjusting screw, drive piece and slot, can also demonstrate the influence of object pressure to frictional force, it is whole more comprehensive, need not worry simultaneously that other extra accessories forget to carry or lose, convenient demonstration smoothly.

Drawings

FIG. 1 is a schematic structural diagram of a preferred embodiment of a physical friction force demonstration apparatus according to the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of the portion B shown in FIG. 2;

FIG. 4 is a top view of the support plate shown in FIG. 1;

fig. 5 is an assembly view of the two supporting slide bars and the moving base in a top cross-sectional view.

The reference numbers in the figures: 1. a base plate; 2. a vertical plate; 3. a support plate; 4. a wire wheel; 5. an electric push rod; 6. a pull wire; 7. a slider; 8. a digital display tension meter; 9. a friction plate; 10. supporting the sliding rod; 11. a movable seat; 12. a first guide slide bar; 13. mounting a block; 14. inserting a block; 15. a spring; 16. adjusting the screw rod; 17. driving the block; 18. a slot; 701. installing a frame; 702. a second guide slide bar; 703. locking the screw rod; 704. pressing a plate; 705. a non-slip mat.

Detailed Description

The utility model is further described with reference to the following figures and embodiments.

Referring to fig. 1 to fig. 5, fig. 1 is a schematic structural diagram of a physical friction force demonstration apparatus according to a preferred embodiment of the present invention; FIG. 2 is an enlarged view of portion A of FIG. 1; FIG. 3 is an enlarged view of the portion B shown in FIG. 2; FIG. 4 is a top view of the support plate shown in FIG. 1; fig. 5 is a schematic assembly view of two supporting slide bars and a movable base in a top sectional view. The device for demonstrating the physical friction force comprises a bottom plate 1, wherein two vertical plates 2 are fixedly mounted at the top of the bottom plate 1, a same supporting plate 3 is fixedly mounted on the outer wall of one side, close to each other, of the two vertical plates 2, a wire passing port is formed in the top of the supporting plate 3, the wire passing port is rotatably mounted on the inner walls of the two sides of the wire passing port through a bearing, a traction wire 6 penetrates through the wire passing port and is movably connected with the inner wall of the wire passing port, an electric push rod 5 is fixedly mounted on the vertical plate 2 far away from the wire passing wheel 4, the electric push rod 5 is positioned below the supporting plate 3, the traction wire 6 is wound on the wire passing wheel 4 and is turned by the wire passing wheel 4, and the bottom end of the traction wire 6 is fixedly connected with an output shaft of the electric push rod 5, the top of the supporting plate 3 is provided with a sliding block 7, the sliding block 7 is fixedly provided with a digital display tension meter 8, the model of the digital display tension meter 8 in this embodiment is ZP-100, the top end of the traction wire 6 is fixedly connected with a hook of the digital display tension meter 8, the supporting plate 3 is fixedly provided with three friction plates 9, the three friction plates 9 are consistent in material and specification, referring to fig. 1 and 4, the tops of the three friction plates 9 are all provided with rough surfaces, the difference is that the roughness of the three rough surfaces is gradually enhanced from right to left, two supporting slide bars 10 located above the supporting plate 3 are fixedly arranged on the outer wall of one side of the two vertical plates 2 close to each other, the two supporting slide bars 10 are slidably provided with a same moving seat 11, the moving seat 11 is slidably provided with two first guiding slide bars 12, specifically referring to fig. 5, the movable seat 11 is provided with two first sliding holes and a first internal thread hole, the first internal thread hole is located between the two first sliding holes, the adjusting screw 16 penetrates through the first internal thread hole and is screwed with the inner wall of the first internal thread hole, the two first guide sliding rods 12 both penetrate through the corresponding first sliding holes and are screwed with the inner wall of the corresponding first sliding holes, the bottom ends of the two first guide sliding rods 12 are fixedly provided with the same mounting block 13, the bottom of the mounting block 13 is fixedly provided with an inserting block 14, the movable seat 11 is provided with the adjusting screw 16 by thread, the bottom end of the adjusting screw 16 is rotatably provided with a driving block 17, specifically, referring to fig. 2, the top of the driving block 17 is provided with a first fixing groove, the bottom end of the adjusting screw 16 extends into the first fixing groove and is fixedly sleeved with a first bearing, the outer ring of the first bearing is fixedly connected with the inner wall of the first fixing groove, the driving block 17 is provided with two second sliding holes, the two first guide sliding rods 12 penetrate through the corresponding second sliding holes and are screwed with the inner walls of the corresponding second sliding holes, the bottom of the driving block 17 is fixedly provided with a spring 15, the bottom end of the spring 15 is fixedly connected with the mounting block 13, the top of the sliding block 7 is provided with a slot 18, the size of the insertion block 14 is matched with that of the slot 18, namely, the insertion block 14 can be just inserted into the slot 18, in the process of clockwise rotating the adjusting screw 16, the adjusting screw 16 moves downwards in the rotating process, then the driving block 17 moves downwards, the driving block 17 gives a downward thrust to the mounting block 13 through the spring 15, so that the insertion block 14 enters the slot 18, in the process of dragging the sliding block 7, the movable seat 11, the adjusting screw 16, the driving block 17, the inserting block 14 and the like can be moved together, when pressure is applied to the sliding block 7, after the inserting block 14 enters the slot 18 and contacts with the inner wall of the bottom of the slot 18, in the process of continuously screwing the adjusting screw 16 clockwise, the inserting block 14 cannot move downwards, the spring 15 can be gradually compressed, and the spring 15 exerts downward elastic force on the inserting block 14 on the sliding block 7, so that the effect of increasing the pressure of the sliding block 7 can be achieved.

Referring to fig. 5, in order to reduce the friction force between the two supporting sliding rods 10 and the moving seat 11 as much as possible, two fixing holes are formed in the moving seat 11, linear bearings are fixedly mounted in the two fixing holes, and the two supporting sliding rods 10 penetrate through the corresponding linear bearings and are slidably connected with the inner walls of the corresponding linear bearings.

Referring to fig. 2, the top fixed mounting who removes seat 11 has the scale, and the scale of scale from top to bottom increases gradually, adjusting screw 16's top fixed mounting has first knob, fixed mounting has the pointer on the first knob, and adjusting screw 16 is down more, and the tighter that spring 15 is then compressed, otherwise the elasticity for sliding block 7 is bigger, and adjusting screw 16 drives first knob and pointer downstream, and the scale that points through the pointer can carry out qualitative judgement to exerted pressure then, and the scale that the pointer points promptly is bigger, and the pressure that currently applys to sliding block 7 is just bigger.

In order to realize the quick detachment and installation of the digital display tension meter 8, in this embodiment, referring to fig. 3, a mounting frame 701 is fixedly mounted on an outer wall of one side of the sliding block 7 close to the reel 4, the digital display tension meter 8 is located in the mounting frame 701, a locking screw 703 is threadedly mounted on an inner wall of the top of the mounting frame 701, a pressing plate 704 is rotatably sleeved at the bottom end of the locking screw 703, specifically, a second fixing groove is formed in the top of the pressing plate 704, the bottom end of the adjusting screw 16 extends into the second fixing groove and is fixedly sleeved with a second bearing, an outer ring of the second bearing is fixedly connected with an inner wall of the second fixing groove, a second knob is fixedly mounted at the top end of the adjusting screw 16, two second guide slide bars 702 are slidably mounted on the inner wall of the top of the mounting frame 701, and the bottom ends of the two second guide slide bars 702 are both fixedly connected with the pressing plate 704, the bottom of clamp plate 704 and the bottom inner wall of installing frame 701 on homoenergetic fixed mounting have slipmat 705, two slipmat 705 all with digital display tensiometer 8 contacts, slipmat 705 is the rubber material, can take place deformation after receiving the extrusion, increase with digital display tensiometer 8's area of contact, then increase frictional force, when digital display tensiometer 8 dismantles, anticlockwise rotation locking screw 703 can make its upward movement, locking screw 703 drives clamp plate 704 and rises to no longer sticis to digital display tensiometer 8, then alright take out digital display tensiometer 8 from installing frame 701.

The working principle of the physical friction force demonstration device provided by the utility model is as follows:

the method comprises the following steps: the teacher can demonstrate the influence of the roughness of the contact surface between the objects on the friction force, firstly, the adjusting screw 16 is rotated clockwise, the adjusting screw 16 pushes the driving block 17 to move downwards, the driving block 17 drives the mounting block 13 and the inserting block 14 to move downwards through the spring 15, after the inserting block 14 enters a part of the slot 18 (the inserting block 14 is ensured not to be contacted with the inner wall of the bottom of the slot 18), the adjusting screw 16 stops rotating, the spring 15 is not compressed at the moment, so that the downward pressure can not be applied to the sliding block 7, then, the output shaft of the electric push rod 5 is started to retract, the electric push rod 5 drives the bottom end of the traction wire 6 to move rightwards, the top end of the traction wire 6 moves leftwards, the traction wire 6 can pull the digital display tension meter 8 and the sliding block 7 to move leftwards, the sliding block 7 moves together through the inserting block 14, the mounting block 13, the moving seat 11 and the like, the sliding block 7 sequentially passes through the three friction plates 9, because the extension and retraction of the output shaft of the electric push rod 5 are uniform, the motion of the sliding block 7 is also uniform, when the sliding block passes through the three friction plates 9, the numerical values displayed on the digital display tensiometer 8 are also stable, relevant teachers and students only need to record the corresponding three numerical values, and as the rough surfaces of the three friction plates 9 from right to left are gradually strengthened, the friction numerical values corresponding to the three friction plates 9 are increased from right to left, so that the conclusion that the friction force is increased under the condition that other conditions are the same, the roughness of the contact surface of an object is increased, and the friction force is increased can be verified;

step two: after the demonstration is completed, the teacher can start the output shaft of the electric push rod 5 to extend out and then reset the sliding block 7 after demonstrating the influence of the pressure on the friction force between the objects, and then continue to screw the adjusting screw 16 clockwise until the spring 15 is compressed, the spring 15 applies a downward elastic force to the insertion block 14 to the sliding block 7, so that the effect of increasing the pressure on the sliding block 7 can be achieved, and then the output shaft of the electric push rod 5 is started again to retract, so that the sliding block 7 passes through the three friction plates 9 at a constant speed again and reads, and since the sliding block 7 is applied with a certain pressure, the three friction force values recorded at this time are all larger than the values in the corresponding step one, thereby verifying that the conclusion that the adjusting screw 16 can be screwed clockwise or counterclockwise under the same other conditions, the larger the friction force is applied to the object, increasing or decreasing the pressure on the sliding block 7, then dragging the sliding block 7 again and reading, and further verifying the conclusion;

in the case where only the effect of the roughness of the object contact surface on the friction is demonstrated, the insert 14 may not be inserted into the slot 18.

Compared with the related art, the device for demonstrating the physical friction force provided by the utility model has the following beneficial effects:

the utility model provides a device for demonstrating physical friction, which can demonstrate the influence of the roughness of the contact surface of an object on the friction by arranging a supporting plate 3, a wire wheel 4, an electric push rod 5, a traction wire 6, a sliding block 7, a digital display tension meter 8 and three friction plates 9, can enable the sliding block 7 to move more uniformly by tearing the traction wire 6 through the electric push rod 5, and is convenient for reading the numerical value on the digital display tension meter 8; through the arrangement of the two supporting slide bars 10, the moving seat 11, the two first guide slide bars 12, the mounting block 13, the inserting block 14, the spring 15, the adjusting screw 16, the driving block 17 and the slot 18, the influence of pressure borne by an object on friction can be demonstrated, and the whole body is more comprehensive.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims (7)

1. A demonstration device for physical friction force comprises a bottom plate and is characterized in that two vertical plates are fixedly mounted at the top of the bottom plate, a same supporting plate is fixedly mounted on the outer wall of one side, close to each other, of the two vertical plates, a wire wheel is rotatably mounted on the supporting plate, an electric push rod is fixedly mounted on the vertical plate far away from the wire wheel and located below the supporting plate, a traction wire is wound on the wire wheel, the bottom end of the traction wire is fixedly connected with an output shaft of the electric push rod, a sliding block is arranged at the top of the supporting plate, a digital display tension meter is fixedly mounted on the sliding block, the top end of the traction wire is fixedly connected with a hook of the digital display tension meter, a plurality of friction plates are fixedly mounted on the supporting plate, and two supporting slide rods located above the supporting plate are fixedly mounted on the outer wall of one side, close to each other, of the two vertical plates, two slidable mounting has same removal seat on supporting the slide bar, slidable mounting has two first direction slide bars, two on removing the seat the bottom fixed mounting of first direction slide bar has same installation piece, the bottom fixed mounting of installation piece has the inserted block, remove the seat and go up the screw thread and install adjusting screw, adjusting screw's bottom is rotated and is installed and drive the piece, two first direction slide bar all runs through drive the piece and with drive a sliding connection, the bottom fixed mounting of drive piece has the spring, the bottom of spring with installation piece fixed connection, the slot has been seted up at the top of sliding block.

2. The device for demonstrating physical friction force as claimed in claim 1, wherein a wire passing hole is opened at the top of said supporting plate, said wire wheel is rotatably installed on the inner walls of both sides of said wire passing hole, said traction wire penetrates said wire passing hole and is movably connected with the inner wall of said wire passing hole.

3. The device for demonstrating physical friction force as claimed in claim 1, wherein said moving seat is opened with two fixing holes, each of said two fixing holes is fixedly installed with a linear bearing, and each of said two supporting sliding rods passes through a corresponding linear bearing and is slidably connected with an inner wall of the corresponding linear bearing.

4. The device for demonstrating physical friction force according to claim 1, wherein a graduated scale is fixedly installed on the top of said moving base, a first knob is fixedly installed on the top end of said adjusting screw, and a pointer is fixedly installed on said first knob.

5. The device for demonstrating physical friction force as claimed in claim 1, wherein a first fixing groove is opened at the top of the driving block, the bottom end of the adjusting screw rod extends into the first fixing groove and is fixedly sleeved with a first bearing, and the outer ring of the first bearing is fixedly connected with the inner wall of the first fixing groove.

6. The device for demonstrating physical friction force according to claim 1, wherein a mounting frame is fixedly mounted on an outer wall of one side of the sliding block close to the wire wheel, the digital display tension meter is located in the mounting frame, a locking screw is mounted on an inner wall of the top of the mounting frame in a threaded manner, a pressing plate is sleeved at the bottom end of the locking screw in a rotating manner, two second guide sliding rods are slidably mounted on the inner wall of the top of the mounting frame, the bottom ends of the two second guide sliding rods are fixedly connected with the pressing plate, anti-slip pads are fixedly mounted on the bottoms of the pressing plate and the inner wall of the bottom of the mounting frame, and the two anti-slip pads are in contact with the digital display tension meter.

7. The device for demonstrating physical friction force as claimed in claim 6, wherein a second fixing groove is opened on the top of said pressing plate, the bottom end of said adjusting screw rod extends into said second fixing groove and a second bearing is fixedly sleeved on said adjusting screw rod, the outer ring of said second bearing is fixedly connected with the inner wall of said second fixing groove, and a second knob is fixedly installed on the top end of said adjusting screw rod.

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