CN220498704U - Pencil hardness detects supplementary grinding device - Google Patents

Abstract

The utility model discloses an auxiliary grinding device for pencil hardness detection, which relates to the technical field of pencil hardness detection, in particular to an auxiliary grinding device for pencil hardness detection. The pencil lead of the pencil is placed towards a grinding wheel fixedly connected with the motor, and the pencil is vertically clamped by a clamping mechanism. And starting the motor, pressing the cross rod from top to bottom, and driving the clamping mechanism to move downwards by the cross rod, so as to drive the pencil to move downwards. And polishing the lead core after the grinding wheel contacts the lead core, so that the lead core is leveled. The lead core is polished mechanically to replace manual operation, so that the polishing precision and the polishing speed of the polished lead core are improved. The technical scheme is mainly used for pencil hardness detection tests and solves the problem that the precision of the tip of the manually ground pencil lead is difficult to control.

Description

Pencil hardness detects supplementary grinding device

Technical Field

The utility model relates to the technical field of pencil hardness detection, in particular to an auxiliary grinding device for pencil hardness detection.

Background

The graphite pencils are divided into 18 types of graphite pencils according to different hardness, namely 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H and 10H, and according to the specification in the light industry standard QB/T2774 of the people's republic of China, a tip stress test, a hardness test, an abrasion test and a slip test are all required to be carried out in the hardness detection method of the pencil, and a pencil sharpener is used for sharpening one end of the pencil and then metallographic sand paper is used for flattening the pencil core of the pencil. At present, a wood rod part is cut off by using a pencil sharpener mainly by manpower, a cylindrical pencil lead is exposed for about 3mm, then metallographic abrasive paper is placed on a hard plane, the pencil lead is vertically leaned against the abrasive paper to draw a circle, and the pencil lead is slowly ground until the pencil tip is ground into the plane, so that the following problems exist in the operation process: firstly, the manual operation efficiency is low and the speed is low; secondly, due to manual operation, the perpendicularity between the pencil and the abrasive paper is difficult to control, and the grinding precision of the tip of the pencil lead is difficult to control; thirdly, the grinding precision of the same batch of samples is difficult to unify, and the standardized detection is not facilitated. It is therefore highly desirable to provide a mechanized lead grinding device to replace manual lead grinding to solve the above-mentioned problems.

Disclosure of Invention

The utility model aims to provide an auxiliary grinding device for pencil hardness detection, which solves the problem that the precision of manually grinding the tip of a pencil lead is difficult to control.

The technical aim of the utility model is realized by the following technical scheme: the utility model provides a pencil hardness detects supplementary grinding device, includes brace table, motor and horizontal pole, fixedly connected with standpipe on the brace table, movable grafting has the dead lever in the standpipe, the one end and horizontal pole fixed connection of brace table are kept away from to the dead lever, the horizontal pole is perpendicular with the dead lever, the free end fixedly connected with fixture of horizontal pole, fixture is used for vertical centre gripping pencil, be equipped with the pressure spring in the standpipe, pressure spring one end offsets with the one end that the dead lever is located the standpipe, and the other end offsets with the brace table, the motor is fixed on the brace table, the vertical orientation fixture setting of output shaft of motor, output shaft fixedly connected with emery wheel.

The principle and effect of the technical scheme are as follows: in the initial state, the wood rod part is cut off by using the pencil sharpener, the pencil lead is placed towards the grinding wheel after the pencil lead is exposed for a section, the pencil is clamped by the clamping mechanism, and a certain distance is reserved between the pencil lead and the grinding wheel. And starting the motor, pressing the cross rod from top to bottom, and driving the clamping mechanism to move downwards by the cross rod, so as to drive the pencil to move downwards. And polishing the lead core after the grinding wheel contacts the lead core, so that the lead core is leveled. After polishing is completed on the lead, the pressure on the cross rod is withdrawn, the pressure spring drives the fixing rod to move upwards, and the fixing rod drives the cross rod and the clamping mechanism to move upwards, so that the grinding wheel is separated from contact with the lead, and the effect of improving the polishing precision and speed of the polished lead is achieved.

The clamping mechanism comprises a fixed block and a first bevel gear, wherein the fixed block is fixedly connected with the free end of a cross rod, the fixed block is cylindrical, an annular groove is formed in the circumference of the bottom of the fixed block, the first bevel gear is movably sleeved in the annular groove, the first bevel gear is collinear with the axis of the annular groove, a spiral chute is formed in one side, away from the tooth part of the first bevel gear, a first through hole penetrating through the upper end and the lower end of the first bevel gear is formed in the fixed block, the horizontal projection of the first through hole is located in the range of the inner circle of the annular groove, a sliding hole arranged in the radial direction is formed in the side surface of the fixed block, the sliding hole is communicated with the annular groove, the sliding hole is communicated with the first through hole, a limiting pin is slidably connected in the sliding hole, a second through hole corresponding to the first through hole is formed in the limiting pin, the bottom of the limiting pin is in the chute, the rib is slidably connected in the chute, the second bevel gear is rotatably connected with the annular groove, and the second bevel gear is meshed with the first bevel gear in the circumferential direction.

Through adopting above-mentioned technical scheme, insert the pencil in first through-hole and the second through-hole, stir the second bevel gear through the space of annular groove, the second bevel gear drives first bevel gear and rotates around the central axis of annular groove, three second bevel gear combined action prevents that spout and rib on the first bevel gear from breaking away from. The spiral chute on the first bevel gear drives the limiting pin to slide in the sliding hole through matching with the rib, so that the second through hole and the first through hole are gradually staggered, and the pencil is clamped together. Because the sliding hole is communicated with the first through hole and is formed along the radial direction of the fixed block, the first through hole is divided into an upper section and a lower section, and the sliding hole is positioned between the two sections of first through holes. The limiting pin is positioned in the sliding hole, so that the second through hole is positioned between the upper section and the lower section of the first through hole. When the first through hole and the second through hole are staggered, the pencil is clamped under the combined action of the upper section and the lower section of the first through hole and the second through hole, and the pencil inserted into the upper section and the lower section of the first through hole is kept vertical under the transverse limiting action of the upper section and the lower section of the first through hole. Because the horizontal projection of the first through hole is positioned in the range enclosed by the inner circle of the annular groove, the pencil can be prevented from interfering with the second bevel gear in the annular groove when being placed in the first through hole.

The utility model is further arranged that the fixed block is provided with blind holes positioned at one side of the inner side of the annular groove close to the center of a circle, the blind holes are arranged along the radial direction of the fixed block, the number of the blind holes is the same as that of the second bevel gears, the side surface of the fixed block is provided with third through holes corresponding to the blind holes, the third through holes and the blind holes are connected with a rotating shaft in a rotating mode, the second bevel gears are fixedly connected to the rotating shaft, and one end, close to the outer side of the fixed block, of the rotating shaft is fixedly connected with a knob.

Through adopting above-mentioned technical scheme, can conveniently rotate the pivot through the knob to make the pivot drive the common rotation of second bevel gear, the second bevel gear drives first bevel gear and rotates around the central axis of annular groove. The spiral chute on the first bevel gear drives the limiting pin to slide in the sliding hole through being matched with the rib, so that the second through hole and the first through hole are gradually staggered, and the pencil is clamped together and kept vertical.

The utility model is further characterized in that two vertical pipes are symmetrically arranged on the supporting table, two sides of the symmetry of the fixing block are fixedly connected with cross bars, each cross bar is fixedly connected with a fixing rod corresponding to the vertical pipe, each fixing rod is arranged in the corresponding vertical pipe in a penetrating mode, and a pressure spring is arranged between each fixing rod and the corresponding vertical pipe.

Through adopting above-mentioned technical scheme, two dead levers and two standpipe mutually support for the both ends of fixed block all obtain the vertical support of horizontal pole, make the fixed block more steady. And the cross rod and the corresponding fixed rod are limited to rotate around the central axis of the vertical pipe, so that the influence on the operation in work is avoided.

The utility model is further characterized in that the first through holes are arranged at intervals along the radial direction of the fixed block, and the limiting pins are provided with second through holes which are in one-to-one correspondence with the first through holes.

Through adopting above-mentioned technical scheme, owing to be equipped with a plurality of first through-hole and rather than the second through-hole that corresponds, when polishing the pencil core, can once only handle a plurality of pencils, greatly increased the efficiency when polishing the pencil core to make same batch of pencils can grind under the same condition of polishing and level, be favorable to standardized detection.

Drawings

FIG. 1 is a schematic perspective view of an embodiment;

FIG. 2 is an exploded view of an embodiment;

FIG. 3 is a schematic view of a partially cut-away perspective view of an embodiment;

FIG. 4 is an enlarged schematic view at A in FIG. 3;

FIG. 5 is a perspective view showing a bottom view of a fixing block according to an embodiment;

FIG. 6 is a schematic perspective view of a first bevel gear from above in an embodiment;

FIG. 7 is an isometric view of a first bevel gear bottom angle in an example;

fig. 8 is a schematic perspective view showing a bottom angle of the stopper pin in the embodiment.

In the figure: the support table 1, the motor 2, the cross rod 3, the vertical pipe 4, the fixed rod 5, the pressure spring 6, the grinding wheel 7, the fixed block 8, the first bevel gear 9, the annular groove 10, the chute 11, the first through hole 12, the slide hole 13, the limiting pin 14, the second through hole 15, the rib 16, the third through hole 17, the rotating shaft 18, the second bevel gear 19 and the knob 20.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

The utility model provides a pencil hardness detects auxiliary grinding device, as shown in fig. 1-8, includes brace table 1, motor 2 and two horizontal poles 3, fixedly connected with two standpipe 4 on the brace table 1, two standpipe 4 set up for brace table 1 bilateral symmetry. The vertical pipe 4 is movably inserted with a fixing rod 5, the upper ends of the two fixing rods 5 are fixedly connected with one ends of the two cross rods 3 respectively, and the cross rods 3 are perpendicular to the fixing rods 5. The free ends of the two cross rods 3 are fixedly connected with clamping mechanisms together, and the clamping mechanisms are used for vertically clamping pencils. Each vertical pipe 4 is internally provided with a pressure spring 6, the upper end of the pressure spring 6 is propped against one end of the fixed rod 5 positioned in the vertical pipe 4, and the lower end is propped against the supporting table 1. The motor 2 is fixedly connected to the center of the upper side of the supporting table 1, an output shaft of the motor 2 is vertically arranged towards the clamping mechanism, the output shaft is fixedly connected with the grinding wheel 7, the grinding wheel 7 is vertical to the output shaft, and the roughness of the grinding wheel 7 is selected according to the requirement of lead core polishing precision.

The clamping mechanism comprises a fixed block 8 and a first bevel gear 9, the free ends of the two cross rods 3 are fixedly connected with the fixed block 8, and the two cross rods 3 are respectively located on two sides symmetrical to the fixed block 8. The fixed block 8 is cylindrical, an annular groove 10 is circumferentially formed in the bottom of the fixed block 8, the first bevel gear 9 is movably sleeved in the annular groove 10, and the first bevel gear 9 is collinear with the axis of the annular groove 10. The tooth portion of the first bevel gear 9 is located at the lower side, and a spiral chute 11 with the central axis of the first bevel gear 9 as the axis is opened at the upper side of the first bevel gear 9. The fixed block 8 is provided with a first through hole 12 penetrating through the upper end and the lower end, six rows of the first through holes 12 are arranged along the circumferential direction of the fixed block 8, and three rows of the first through holes are arranged along the radial direction of the fixed block 8. The annular edge of one side of the inner side of the annular groove 10, which is close to the center of the fixed block 8, is an inner ring, and the horizontal projection of all the first through holes 12 is positioned in the range enclosed by the inner ring of the annular groove 10, so that interference between the pencil and the first bevel gear 9 in the annular groove 10 when the pencil is placed in the first through holes 12 is avoided. The lateral surface of the fixed block 8 is provided with sliding holes 13 arranged along the radial direction of the fixed block 8, six sliding holes 13 are arranged along the circumferential direction of the fixed block 8, and the six sliding holes 13 are in one-to-one correspondence with the six rows of first through holes 12. The slide holes 13 communicate with the annular grooves 10, and the slide holes 13 communicate with the corresponding first through holes 12. The sliding hole 13 is slidably connected with a limiting pin 14, and three second through holes 15 corresponding to the first through holes 12 are formed in the limiting pin 14. The bottom of the limiting pin 14 is provided with four ribs 16 which are matched with the chute 11, the ribs 16 are arranged at intervals in the longitudinal direction of the limiting pin 14, the intervals between the ribs 16 are matched with the spiral chute 11, and the ribs 16 are connected in the chute 11 in a sliding mode.

The fixed block 8 is provided with a blind hole positioned at one side of the inner side of the annular groove 10 close to the center of a circle, the blind hole is arranged along the radial direction of the fixed block 8, and three blind holes are arranged along the circumferential direction of the fixed block 8. The side of fixed block 8 has seted up the third through hole 17 that corresponds with the blind hole, and third through hole 17 and the blind hole that corresponds are rotated jointly and are connected with pivot 18, all fixedly connected with second bevel gears 19 on every pivot 18, and all second bevel gears 19 all mesh with first bevel gears 9 and are connected, and one of them pivot 18 is close to the one end fixedly connected with knob 20 in the outside of fixed block 8.

Working principle: in the initial state, the wood rod part is cut by using the pencil sharpener, the pencil lead is placed towards the grinding wheel 7 after the pencil lead is exposed for a section, the pencil is clamped by the clamping mechanism, and a certain distance is reserved between the pencil lead and the grinding wheel 7. The motor 2 is started, the cross rod 3 is pressed from top to bottom, and the cross rod 3 drives the clamping mechanism to move downwards, so that the pencil is driven to move downwards. The lead core is polished after the grinding wheel 7 contacts the lead core, so that the lead core is flattened. After finishing polishing the lead, the pressure to the cross rod 3 is withdrawn, the pressure spring 6 drives the fixed rod 5 to move upwards, and the fixed rod 5 drives the cross rod 3 and the clamping mechanism to move upwards, so that the grinding wheel 7 is separated from contact with the lead, and the effect of improving the polishing precision and speed of the polished lead is achieved.

The pencil is inserted into the first through hole 12 and the second through hole 15, and the rotary shaft 18 can be conveniently rotated through the knob 20, so that the rotary shaft 18 drives the second bevel gear 19 to jointly rotate, and the second bevel gear 19 drives the first bevel gear 9 to rotate around the central axis of the annular groove 10. The spiral chute 11 on the first bevel gear 9 drives the limiting pin 14 to slide in the sliding hole 13 through matching with the rib 16, so that the second through hole 15 and the first through hole 12 are gradually staggered from each other, and the pencil is clamped together and kept vertical. Two dead levers 5 and two standpipe 4 mutually support and make the both ends of fixed block 8 all obtain the vertical support of horizontal pole 3 for fixed block 8 is more steady. And the rotation of the crossbar 3 and the corresponding fixing bars 5 about the central axis of the standpipe 4 is restricted, so as to avoid affecting the operation in operation. Since the plurality of first through holes 12 and the corresponding second through holes 15 are provided, a plurality of pencils can be processed at one time when polishing pencil cores. Because the lower end of the pencil core is propped against the surface of the grinding wheel 7 in the initial state, the motor 2 is started, the motor 2 drives the grinding wheel 7 to rotate, and at the moment, the friction force between the grinding wheel 7 and the pencil core is static friction force, and compared with sliding friction force, the pencil core is easy to break, so that the detection work is influenced. Since the slide hole 13 is communicated with the first through hole 12 and is opened along the radial direction of the fixed block 8, the first through hole 12 is divided into an upper section and a lower section, and the slide hole 13 is positioned between the two sections of the first through holes 12. The limiting pin 14 is located in the sliding hole 13, so that the second through hole 15 is located between the upper section and the lower section of the first through hole 12. When the first through hole 12 and the second through hole 15 are staggered, the pencil is clamped under the combined action of the upper section and the lower section of the first through hole 12 and the second through hole 15, and the pencil inserted into the upper section and the lower section of the first through hole 12 is kept vertical under the transverse limiting action of the upper section and the lower section of the first through hole 12. Since the horizontal projection of the first through hole 12 is located within the range enclosed by the inner circumference of the annular groove 10, interference with the second bevel gear 19 in the annular groove 10 when the pencil is put into the first through hole 12 can be avoided. When a plurality of pencils in the same batch are processed simultaneously, the fixing block 8 is pressed downwards for a certain distance, all pencils are placed into the first through holes 12 one by one, the pencils move downwards under the action of gravity, the lead cores at the lower ends of all pencils are propped against the grinding wheel 7, so that the lower ends of all pencils are aligned, the knob 20 is rotated to enable the first through holes 12 and the second through holes 15 to clamp all pencils together, the pressure on the fixing block 8 is removed, the fixing block 8 moves upwards for a certain distance under the action of the pressure spring 6, the lead cores are separated from the grinding wheel 7, and at the moment, the lower sheets of all pencils are positioned in the same plane, so that subsequent polishing is facilitated. Therefore, the efficiency of polishing pencil leads is greatly increased, and the same batch of pencils can be polished under the same polishing condition, thereby being beneficial to standardized detection.

The present embodiment is only for explanation of the present utility model and is not to be construed as limiting the present utility model, and modifications to the present embodiment, which may not creatively contribute to the present utility model as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present utility model.

Claims (5)

1. The utility model provides a pencil hardness detects supplementary grinding device, includes brace table, motor and horizontal pole, its characterized in that: the vertical pipe is fixedly connected on the supporting table, the fixing rod is movably inserted in the vertical pipe, one end of the fixing rod, which is far away from the supporting table, is fixedly connected with the cross rod, the cross rod is vertical to the fixing rod, the free end of the cross rod is fixedly connected with the clamping mechanism, the clamping mechanism is used for vertically clamping the pencil, the vertical pipe is internally provided with a pressure spring, one end of the pressure spring is propped against one end of the fixed rod, which is positioned in the vertical pipe, the other end of the pressure spring is propped against the supporting table, the motor is fixed on the supporting table, the output shaft of the motor is vertically arranged towards the clamping mechanism, and the output shaft is fixedly connected with a grinding wheel.

2. The pencil hardness testing auxiliary grinding device as set forth in claim 1, wherein: the clamping mechanism comprises a fixed block and a first bevel gear, the fixed block is fixedly connected with the free end of the cross rod, the fixed block is cylindrical, an annular groove is formed in the circumferential direction of the bottom of the fixed block, the first bevel gear is movably sleeved in the annular groove, the first bevel gear is collinear with the axis of the annular groove, a spiral chute is formed in one side, deviating from the tooth part of the first bevel gear, a first through hole penetrating through the upper end and the lower end of the first bevel gear is formed in the fixed block, the horizontal projection of the first through hole is located in the range of the inner circle of the annular groove, a slide hole arranged along the radial direction is formed in the side face of the fixed block, the slide hole is communicated with the annular groove, a limiting pin is connected in the slide hole in a sliding mode, a second through hole corresponding to the first through hole is formed in the limiting pin, a rib corresponding to the first through hole is arranged at the bottom of the limiting pin, the first bevel gear is connected in the chute in a sliding mode, and the second bevel gear is connected in the annular groove in a sliding mode, and the second bevel gear is connected with the first bevel gear and at least one third bevel gear is meshed along the circumferential direction.

3. A pencil hardness testing auxiliary grinding device as set forth in claim 2, wherein: the fixed block is provided with a blind hole positioned on one side, close to the center of a circle, of the inner side of the annular groove, the blind holes are arranged along the radial direction of the fixed block, the number of the blind holes is the same as that of the second bevel gears, the side surface of the fixed block is provided with a third through hole corresponding to the blind holes, the third through hole and the blind holes are connected with a rotating shaft in a common rotating mode, the second bevel gears are fixedly connected to the rotating shaft, and one end, close to the outer side of the fixed block, of the rotating shaft is fixedly connected with a knob.

4. A pencil hardness testing auxiliary grinding device as defined in any one of claims 2-3, wherein: the vertical pipes are provided with two, two vertical pipe symmetry sets up on the brace table, equal fixedly connected with horizontal pole on the both sides of fixed block symmetry, every equal fixedly connected with dead lever that corresponds with the vertical pipe on the horizontal pole, every the dead lever is all worn to establish in the corresponding vertical pipe, all be equipped with the pressure spring between dead lever and the corresponding vertical pipe.

5. A pencil hardness testing auxiliary grinding device as defined in any one of claims 2-3, wherein: the first through holes are arranged at intervals along the radial direction of the fixed block, and the limiting pins are provided with second through holes which are in one-to-one correspondence with the first through holes.