A dental composite resin wear resistance testing device

Abstract

The present invention relates to the field of dental material wear experiments, and specifically to a dental composite resin wear resistance test device, comprising a base and an upper clamping unit; a pressing unit for providing a pressing force to the upper clamping unit is arranged on the upper part of the upper clamping unit, the pressing unit comprises a pressing block arranged above the upper clamping unit, the pressing block always applies a vertical downward pressure to the upper clamping unit during the process of moving in the vertical direction, a first guide plate is rotatably arranged on one side of the pressing block, the peripheral wall of the first guide plate is staggered with upper inclined grooves, lower inclined grooves and horizontal grooves, the upper inclined grooves, lower inclined grooves and horizontal grooves together form a guide groove, an extension column is arranged on one side of the pressing block, the extension column extends into the guide groove and slidably cooperates with the guide groove. The present invention simulates three chewing states in a mixed manner, thereby improving the authenticity of the test.

Description

Technical Field

[0001] The invention relates to the field of dental material wear experiments, in particular to a dental composite resin wear resistance testing device. Background Art

[0002] Dental composite resin materials are often used to make dentures. However, due to the limitations of the use environment of dentures, the wear resistance of the composite resin materials must be high. Currently, the equipment used to test dental composite resin materials mostly simulates the tooth biting action and causes the composite resin material to rotate relative to the tooth after biting. Although the composite resin materials can be tested, they cannot simulate the wear state of the teeth during chewing in real situations.

[0003] Chinese patent application CN101063648A discloses a tooth wear tester, which is composed of an electrical device and a mechanical action device. The mechanical action device has a frame platform on which 6 to 8 groups of tooth wear test units are arranged in parallel, and a crossbeam that can make up and down reciprocating movements under the action of a cam transmission mechanism is arranged on the upper part of the frame platform. Each tooth wear test unit includes a pair of upper and lower teeth chewing simulation mechanisms that can be contacted and engaged, wherein: the lower teeth simulation mechanism is composed of an inclined fixed block, a movable block arranged on the inclined surface of the fixed block, and a movable block spring reset member arranged at the lower end of the inclined surface of the fixed block for returning the movable block to its original position, and the movable block is clamped with simulated lower teeth; the upper teeth simulation mechanism includes a long rod mounted on the crossbeam through a T-shaped sleeve, and the lower end of the long rod is clamped with simulated upper teeth, and a counterweight is installed on the upper part of the long rod. In actual work, the crossbeam is made to make regular up and down reciprocating movements through the action of the cam transmission mechanism, driving each group of long rods to move up or down. When the long rod moves upward, the upper teeth are separated from the lower teeth; when the long rod moves downward, the upper teeth move downward and contact the lower teeth. Under the action of the counterweight and the lower inclined block on the lower teeth simulation mechanism, the two teeth undergo a slight reciprocating misalignment movement in the horizontal direction while bearing the vertical force, forming a simulation of the chewing force of the teeth in the mouth.

[0004] Although the testing machine in the above scheme can simulate the wear state of teeth during chewing, the entire volume is large and the floor space of the testing machine is large. At the same time, since the testing machine is large and the composite resin material used for the experiment is small, it is impossible to reasonably control the wear pressure on the composite resin material. That is, during the experiment, due to the large test pressure, the composite resin material exceeds the design strength and then breaks. In addition, the existing method of simulating chewing is single. There are three situations when chewing: constant force, gradual force and gradual release of force. The existing simulation method can only simulate constant force or gradual force, and lacks the authenticity of the test. Summary of the invention

[0005] In view of the above problems, a dental composite resin wear resistance testing device is provided. By setting a pressing block and a first guide plate with an upper inclined groove, a lower inclined groove and a horizontal groove, and a translation unit, three chewing states are simulated and mixed, thereby improving the authenticity of the test.

[0006] In order to solve the problems of the prior art, the present invention provides a dental composite resin wear resistance testing device, comprising a base, a lower clamping unit is arranged on the base, an upper clamping unit is arranged on the upper part of the lower clamping unit; a pressing unit for providing a pressing force to the upper clamping unit is arranged on the upper part of the upper clamping unit, the pressing unit comprises a pressing block arranged above the upper clamping unit, the pressing block always applies a vertical downward pressure to the upper clamping unit during the process of moving in the vertical direction, a first guide plate is rotatably arranged on one side of the pressing block, and the peripheral wall of the first guide plate An upper inclined groove, a lower inclined groove and a horizontal groove are arranged alternately, and the upper inclined groove, the lower inclined groove and the horizontal groove together form a guide groove. An extension column is arranged on one side of the pressing block, and the extension column extends into the guide groove and slides with the guide groove. After the first guide plate rotates, when the extension column is located in the upper inclined groove, the pressing block rises, and the pressure of the pressing block on the upper clamping unit decreases. When the extension column is located in the lower inclined groove, the pressing block descends, and the pressure of the pressing block on the upper clamping unit increases. When the extension column is located in the horizontal groove, the height of the pressing block remains unchanged, and the pressure of the pressing block on the upper clamping unit remains constant.

[0007] Preferably, there is a gap between the pressing block and the upper clamping unit, and a spring is arranged in the gap along the vertical direction. The two ends of the spring are respectively fixedly connected to the pressing block and the upper clamping unit. During testing, when the extension column is located in the horizontal groove, the compression of the spring is the smallest.

[0008] Preferably, in the continuously connected upper inclined groove, lower inclined groove and horizontal groove, the length of the horizontal groove is smaller than the length of the upper inclined groove and the lower inclined groove, and the lengths of the upper inclined groove and the lower inclined groove are the same, the connection between the upper inclined groove and the lower inclined groove is the first intersection point, the connection between the upper inclined groove and the horizontal groove is the second intersection point, the connection between the lower inclined groove and the horizontal groove is the third intersection point, the second intersection point and the third intersection point have the same height and are at the highest position in the guide groove, and the first intersection point is at the lowest position.

[0009] Preferably, a pressure sensor is provided at the connection between the pressing block and the spring, and the pressure sensor is used to monitor the real-time elastic force of the spring. The pressure sensor is preset with an initial pressure value, and the lower clamping unit can move in the vertical direction. When the spring elastic force reaches the initial pressure value, the lower clamping unit stops moving.

[0010] Preferably, a bracket is fixedly provided on the base, the bracket is a rotating body structure, translation grooves are evenly opened on the bracket, the translation grooves are evenly arranged on the bracket around the axis of the bracket, the translation grooves are arc-shaped structures, a translation unit is slidably provided in the translation grooves, the translation unit and the upper clamping unit move synchronously in the horizontal direction, and the translation unit moves back and forth in the translation groove along the extension direction of the translation groove.

[0011] Preferably, the translation unit includes a translation block slidably arranged in the translation groove along the extension direction of the translation groove, a translation rod is penetrated through the translation block in the vertical direction, the translation rod and the translation block are slidably matched in the vertical direction and are key-connected, and the bottom of the translation rod is connected to the upper part of the upper clamping unit.

[0012] Preferably, a bellows is arranged between the translation block and the end of the translation slot, a bellows is arranged on each side of the translation block, a connecting pipeline is arranged on the bracket, the bellows is connected to the connecting pipeline, hydraulic oil is arranged in the bellows and the connecting pipeline, a water pump is arranged on the connecting pipeline, when the translation unit is running, the water pump draws out the hydraulic oil in one of the bellows and discharges it into the other bellows, and then the water pump runs in reverse, repeating the cycle.

[0013] Preferably, a bellows sleeve is provided on the outer sleeve of the spring, and the bellows sleeve expands and contracts synchronously with the spring, forming an air cavity in the bellows sleeve, and a switch valve is provided on one side of the bellows sleeve, and the switch valve is connected to the air cavity. During the test, the switch valve is in a normally open state. When the test is completed, the lower clamping unit descends, and the pressure value monitored by the pressure sensor gradually decreases. When the monitored pressure value becomes zero, the switch valve is closed.

[0014] Preferably, the upper clamping unit includes an upper clamping plate, on which a plurality of upper clamping jaws are arranged, the upper clamping jaws are evenly distributed on the upper clamping plate around the axis of the upper clamping plate, and the upper clamping jaws can move in the radial direction of the clamping plate, the upper clamping jaws are driven by hydraulic pressure, and a suction cup is arranged at the bottom of the upper clamping plate, and the large opening of the suction cup is vertically facing downward, and the suction cup is used to adsorb the end face of the test piece placed on the upper clamping plate.

[0015] Preferably, the lower clamping unit includes a lower clamping plate arranged on the base, the lower clamping plate moves in the vertical direction, a plurality of lower clamping jaws are arranged on the lower clamping plate, the lower clamping jaws move in the radial direction of the lower clamping plate, the lower clamping jaws are driven by hydraulic pressure, and a lifting unit is arranged at the lower part of the lower clamping plate, the lifting unit is used to drive the lower clamping plate to move in the vertical direction.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Before the test, the test piece is installed on the upper clamping unit and the lower clamping unit respectively. The lower clamping unit can be raised and lowered on the base in the vertical direction. When the test piece is installed on the lower clamping unit, the lower clamping unit is lowered to the lowest position. For the convenience of description, the test piece clamped on the upper clamping unit is called the upper test piece, and the test piece clamped on the lower clamping unit is called the lower test piece. At this time, the ends of the upper and lower test pieces after installation are not in contact with each other. Then the lower clamping unit drives the lower test piece to rise. It is worth noting that when the upper clamping unit clamps the upper test piece, the extension column on the pressing block is located in the water. In the flat groove, the lower clamping unit then drives the lower test piece to rise. When the upper test piece contacts the lower test piece, an initial pressure value is preset. When the initial pressure value is reached, the lower clamping unit stops rising, and then the upper clamping unit drives the upper test piece to reciprocate in the horizontal direction. At the same time, the first guide plate starts to rotate. The first guide plate guides the pressing block through the guide groove, so that the pressing block moves from the horizontal groove to the lower inclined groove and then to the upper inclined groove, and repeats the cycle. In this way, the three stress states of teeth when people chew can be simulated, and the three chewing states are mixed together for simulation, which improves the authenticity of the test.

[0018] 2. A bellows sleeve is provided on the periphery of the spring, and a switch valve is provided on the bellows sleeve, so as to prevent the spring from being pulled up due to the gravity of the upper clamping unit after the test is completed, thereby extending the service life of the spring.

[0019] 3. By arranging a suction cup on the upper clamping plate in the upper clamping unit, when the test piece is mounted on the upper clamping plate, the squeezed suction cup can adsorb the test piece, thereby improving the convenience of mounting the test piece on the upper clamping unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of a dental composite resin wear resistance testing device.

[0021] Figure 2 It is a dental composite resin wear resistance testing equipment Figure 1 A local enlarged schematic diagram of point A in the middle.

[0022] Figure 3 A side view of a dental composite resin wear test device.

[0023] Figure 4 It is a dental composite resin wear resistance testing equipment Figure 3 Schematic cross-sectional view at the middle BB.

[0024] Figure 5 It is a dental composite resin wear resistance testing equipment Figure 4 A partial enlarged schematic diagram of point C in the middle.

[0025] Figure 6 A cutaway perspective view of a dental composite resin wear test device Figure 1 .

[0026] Figure 7 A cutaway perspective view of a dental composite resin wear test device Figure 2 .

[0027] Figure 8 It is a dental composite resin wear resistance testing equipment Figure 7 A partial enlarged schematic diagram of point D in the middle.

[0028] Fig. 9 It is a three-dimensional schematic diagram of a dental composite resin wear resistance testing device with part of the base removed.

[0029] Fig.10 It is a dental composite resin wear resistance testing equipment Fig. 9 A partial enlarged schematic diagram of point E in the middle.

[0030] Fig.11 The present invention is a three-dimensional schematic diagram of a dental composite resin wear resistance testing device with a base and a lower clamping unit removed.

[0031] The numbers in the figure are:

[0032] 1. Base; 2. Test piece; 3. Lower clamping unit; 31. Lower clamping plate; 32. Lower clamping jaw; 33. Lifting unit; 331. Second rotary driver; 332. Second guide plate; 333. Wave groove; 334. Lifting block; 4. Upper clamping unit; 41. Upper clamping plate; 42. Upper clamping jaw; 43. Suction cup; 44. Pump body; 5. Pressing unit; 51. Pressing block; 52. First guide plate; 521. Upper inclined groove; 522. Lower inclined groove; 523. Horizontal groove; 53. First rotary driver; 54. Gear; 55. Gear ring; 56. Connecting frame; 57. Spring; 58. Bellows sleeve; 59. Switch valve; 6. Bracket; 61. Translation groove; 7. Translation unit; 71. Translation block; 72. Translation rod; 73. Bellows; 74. Water pump. DETAILED DESCRIPTION

[0033] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Reference Figure 1 , Figure 3 , Figure 4 , Figure 6 and Fig.10A dental composite resin wear resistance testing device, comprising a base 1, a lower clamping unit 3 is arranged on the base 1, an upper clamping unit 4 is arranged on the upper part of the lower clamping unit 3; a pressing unit 5 for providing a pressing force to the upper clamping unit 4 is arranged on the upper part of the upper clamping unit 4, the pressing unit 5 comprises a pressing block 51 arranged above the upper clamping unit 4, the pressing block 51 always applies a vertical downward pressure to the upper clamping unit 4 during the process of moving in the vertical direction, a first guide plate 52 is rotatably arranged on one side of the pressing block 51, and the peripheral wall of the first guide plate 52 is staggered with upper inclined grooves 521, lower inclined grooves 522 and The horizontal groove 523, the upper inclined groove 521, the lower inclined groove 522 and the horizontal groove 523 together form a guide groove, and an extension column is provided on one side of the pressing block 51, and the extension column extends into the guide groove and slidably cooperates with the guide groove. After the first guide plate 52 rotates, when the extension column is located in the upper inclined groove 521, the pressing block 51 rises, and the pressure of the pressing block 51 on the upper clamping unit 4 is reduced. When the extension column is located in the lower inclined groove 522, the pressing block 51 descends, and the pressure of the pressing block 51 on the upper clamping unit 4 is increased. When the extension column is located in the horizontal groove 523, the height of the pressing block 51 remains unchanged, and the pressure of the pressing block 51 on the upper clamping unit 4 remains constant.

[0035] When the existing dental composite resin wear equipment performs wear tests on teeth, the test method is single and cannot simulate the real usage scenario, that is, when using teeth for chewing in daily life, there are three methods, namely, constant force, gradual force and gradual release of force. Under constant force, the vertical pressure between the upper and lower teeth during friction remains unchanged. When gradually applying force, the vertical pressure between the upper and lower teeth gradually increases over time, so the wear of the upper and lower teeth will also increase. When gradually releasing force, the vertical pressure between the upper and lower teeth gradually decreases over time, so the wear of the upper and lower teeth will decrease. The existing wear resistance test method is relatively single and can only simulate one of the methods. Therefore, the test result The error of the result is also large. People usually mix the three chewing methods when chewing. In this way, the present invention redesigns the pressing unit 5 according to the above three chewing methods. The specific working principle is as follows: a connecting frame 56 is fixedly arranged at the bottom of the first guide plate 52, and a gear ring 55 is fixedly sleeved on the periphery of the connecting frame 56. A gear 54 is rotatably arranged on one side of the gear ring 55. The gear ring 55 and the gear 54 are meshed with each other. A first rotating driver 53 is fixedly arranged at the end of the gear 54. The first rotating driver 53 is used to drive the gear 54 to rotate. The first rotating driver 53 is preferably a servo motor. After the first rotating driver 53 is started, the first rotating driver 53 drives the gear ring 55 to rotate through the gear 54, so that the connecting frame 56 rotates the first guide plate 52. A guide plate 52 is driven to rotate. Before the test, the test piece 2 is installed on the upper clamping unit 4 and the lower clamping unit 3 respectively. The test piece 2 refers to a dental composite resin. For the convenience of expression, the dental composite resin is referred to as the test piece 2. The lower clamping unit 3 can be raised and lowered on the base 1 in the vertical direction. When the test piece 2 is installed on the lower clamping unit 3, the lower clamping unit 3 is lowered to the lowest position. For the convenience of expression, the test piece 2 clamped on the upper clamping unit 4 is called the upper test piece 2, and the test piece 2 clamped on the lower clamping unit 3 is called the lower test piece 2. At this time, the ends of the upper and lower test pieces 2 after installation are not in contact with each other. Then the lower clamping unit 3 drives the lower test piece 2 to rise. It is worth noting that when the upper clamping unit 4 clamps When the upper test piece 2 is held, the extension column on the pressing block 51 is located in the horizontal groove 523, and then the lower clamping unit 3 drives the lower test piece 2 to rise. When the upper test piece 2 contacts the lower test piece 2, an initial pressure value is preset. When the initial pressure value is reached, the lower clamping unit 3 stops rising, and then the upper clamping unit 4 drives the upper test piece 2 to reciprocate in the horizontal direction. At the same time, the first guide plate 52 starts to rotate. The first guide plate 52 guides the pressing block 51 through the guide groove, so that the pressing block 51 moves from the horizontal groove 523 to the lower inclined groove 522 and then to the upper inclined groove 521, and repeats the cycle. In this way, the three stress states of teeth when people chew can be simulated, and the three chewing states are mixed together for simulation, which improves the authenticity of the test.

[0036] Reference Fig.11 : There is a gap between the pressing block 51 and the upper clamping unit 4, and a spring 57 is arranged in the vertical direction on the gap. The two ends of the spring 57 are respectively fixedly connected to the pressing block 51 and the upper clamping unit 4. During the test, when the extension column is located in the horizontal groove 523, the compression of the spring 57 is the smallest.

[0037] During the test, the upper and lower test pieces 2 will contact each other. When the upper and lower test pieces 2 contact each other, the compression amount of the spring 57 is the smallest, and the compression amount of the spring 57 at this time is called the initial pressure value. The setting of the initial pressure value needs to be determined according to the actual test requirements, that is, the pressure of the upper and lower test pieces 2 is adjusted by lifting the lower clamping unit 3, so that the initial pressure value generated by the spring 57 can meet the test requirements. At the beginning of the test, the extension column is located in the horizontal groove 523. As the first guide plate 52 rotates, the extension column moves from the horizontal groove 523 to the horizontal groove 523. The lower inclined groove 522 moves, and when the extension column enters the lower inclined groove 522 and slides, the squeezing force of the pressing block 51 on the spring 57 gradually increases, and the compression of the spring 57 also gradually increases. At this time, the pressure of the upper test piece 2 on the lower test piece 2 gradually increases, and when the extension column enters the upper inclined groove 521 from the lower inclined groove 522, the pressing block 51 gradually rises, the compression of the spring 57 gradually decreases, and the pressure of the upper test piece 2 on the lower test piece 2 gradually decreases. In this way, it can simulate the three chewing methods that teeth need to experience during daily chewing, thereby improving the authenticity of the test.

[0038] Reference Figure 1-Figure 11 : Among the continuously connected upper inclined groove 521, lower inclined groove 522 and horizontal groove 523, the length of the horizontal groove 523 is smaller than the length of the upper inclined groove 521 and the lower inclined groove 522, and the lengths of the upper inclined groove 521 and the lower inclined groove 522 are the same, the connection between the upper inclined groove 521 and the lower inclined groove 522 is the first intersection, the connection between the upper inclined groove 521 and the horizontal groove 523 is the second intersection, and the connection between the lower inclined groove 522 and the horizontal groove 523 is the third intersection. The second intersection and the third intersection have the same height and are at the highest position in the guide groove, and the first intersection is at the lowest position.

[0039] When the pressing block 51 is at the first intersection, the compression amount of the spring 57 is the largest, and when the pressing block 51 is at the second intersection or the third intersection, the compression amount of the spring 57 is the smallest.

[0040] Reference Figure 1-Figure 11 : A pressure sensor is provided at the connection between the pressing block 51 and the spring 57. The pressure sensor is used to monitor the real-time elastic force of the spring 57. The pressure sensor is preset with an initial pressure value. The lower clamping unit 3 can move in the vertical direction. When the elastic force of the spring 57 reaches the initial pressure value, the lower clamping unit 3 stops moving.

[0041] Reference Figure 6-Figure 8 : A bracket 6 is fixedly arranged on the base 1, and the bracket 6 is a rotating body structure. Translation grooves 61 are evenly opened on the bracket 6. The translation grooves 61 are evenly arranged on the bracket 6 around the axis of the bracket 6. The translation grooves 61 are arc-shaped structures. A translation unit 7 is slidably arranged in the translation groove 61. The translation unit 7 moves synchronously with the upper clamping unit 4 in the horizontal direction, and the translation unit 7 reciprocates in the translation groove 61 along the extension direction of the translation groove 61.

[0042] The reciprocating distance of the translation unit 7 needs to be smaller than the minimum size of the cross section of the test piece 2. This can prevent the upper test piece 2 from being misaligned with the lower test piece 2 when the translation unit 7 drives the upper test piece 2 to move in the horizontal direction through the upper clamping unit 4 after the upper test piece 2 contacts the lower test piece 2. This ensures that the test end surfaces of the upper test piece 2 and the lower test piece 2 are always in contact. The purpose of setting the translation unit 7 is to simulate the relative friction between the upper and lower teeth during chewing, thereby chewing the food. In this way, by setting the translation unit 7, the translation unit 7 can be synchronized during the rotation of the first guide plate 52, thereby further improving the authenticity of the test.

[0043] Reference Figure 6-Figure 8 The translation unit 7 includes a translation block 71 which is slidably arranged in the translation groove 61 along the extension direction of the translation groove 61, and a translation rod 72 is vertically penetrated on the translation block 71. The translation rod 72 is slidably matched with the translation block 71 along the vertical direction and is key-connected. The bottom of the translation rod 72 is connected to the upper part of the upper clamping unit 4.

[0044] The translation rod 72 and the pressing block 51 are slidably matched in the vertical direction and are key-connected, that is, the pressing block 51 can only move in the vertical direction and cannot rotate. The extension direction of the translation slot 61 is parallel to the horizontal plane. The spring 57 is sleeved on the periphery of the translation rod 72. During the test, the lower clamping unit 3 holds the lower test piece 2 to lift the upper clamping unit 4 that clamps the upper test piece 2, so that the spring 57 between the upper clamping unit 4 and the pressing block 51 is gradually squeezed, and after reaching the initial pressure value, the lower clamping unit 3 stops rising, and then the translation block 71 reciprocates in the translation slot 61. The translation block 71 drives the upper clamping unit 4 to reciprocate in the horizontal direction through the translation rod 72. The translation block 71 can only slide in the translation slot 61 along the extension direction of the translation slot 61, and the translation block cannot move in the vertical direction.

[0045] Reference Figure 8: A bellows 73 is arranged between the translation block 71 and the end of the translation slot 61, and a bellows 73 is arranged on both sides of the translation block 71 respectively. A connecting pipeline is arranged on the bracket 6, and the bellows 73 is connected to the connecting pipeline. Hydraulic oil is arranged in the bellows 73 and the connecting pipeline. A water pump 74 is arranged on the connecting pipeline. When the translation unit 7 is running, the water pump 74 draws out the hydraulic oil in one of the bellows 73 and discharges it into the other bellows 73, and then the water pump 74 runs in reverse, repeating the cycle.

[0046] Since the translation block 71 is always located in the translation groove 61, the translation block 71 will not slip out of the translation groove 61 when sliding in the translation groove 61. When the translation unit 7 is started, the water pump 74 draws out the hydraulic oil in one of the bellows 73 and discharges it into the bellows 73 on the other side of the translation block 71. The translation block 71 located in the translation groove 61 can move smoothly in the translation groove 61. When the water pump 74 rotates in the opposite direction, the translation block 71 can move in the opposite direction along the extension direction of the translation groove 61, so that the translation block 71 can move back and forth in the extension direction of the translation groove 61.

[0047] Reference Fig.11 A bellows sleeve 58 is provided on the outer sleeve of the spring 57. The bellows sleeve 58 expands and contracts synchronously with the spring 57. An air cavity is formed in the bellows sleeve 58. A switch valve 59 is provided on one side of the bellows sleeve 58. The switch valve 59 is connected to the air cavity. During the test, the switch valve 59 is in a normally open state. When the test is completed, the lower clamping unit 3 descends, and the pressure value monitored by the pressure sensor gradually decreases. When the monitored pressure value becomes zero, the switch valve 59 is closed.

[0048] In this way, the air cavity is self-locked. The volume of the air cavity after self-locking will not change, and the length of the bellows sleeve 58 will not change. The two ends of the bellows sleeve 58 are fixedly connected to the pressing block 51 and the upper clamping unit 4 respectively, so that the air cavity is in a completely sealed state when the switch valve 59 is closed. Since the bellows sleeve 58 cannot be extended, the spring 57 cannot be extended any more. At this time, the spring 57 is in a non-stretched state. If the bellows sleeve 58 and the switch valve 59 are not provided, when the test is completed, the upper clamping unit 4 will generate a pulling force on the spring 57 due to its own gravity after the lower clamping unit 3 descends, causing the spring 57 to stretch. If the spring 57 is in the above state for a long time when not in use, the service life of the spring 57 will be reduced. After the bellows sleeve 58 and the switch valve 59 are provided, the service life of the spring 57 can be extended.

[0049] Reference Figure 3-Figure 5The upper clamping unit 4 includes an upper clamping plate 41, on which a plurality of upper clamping jaws 42 are arranged. The upper clamping jaws 42 are evenly distributed on the upper clamping plate 41 around the axis of the upper clamping plate 41, and the upper clamping jaws 42 can move along the radial direction of the clamping plate. The upper clamping jaws 42 are driven by hydraulic pressure, and a suction cup 43 is arranged at the bottom of the upper clamping plate 41. The large opening of the suction cup 43 is vertically downward, and the suction cup 43 is used to adsorb the end face of the test piece 2 placed on the upper clamping plate 41.

[0050] The bottom of the translation rod 72 is fixedly connected to the upper part of the upper clamping plate 41, and the translation rod 72 passes through the pressing block 51 in the vertical direction. A pump body 44 is arranged on the upper part of the translation rod 72, and the pump body 44 and the suction cup 43 are connected with each other. When the test piece 2 is installed on the upper clamping plate 41, it is necessary to press the upper part of the test piece 2 on the lower part of the upper clamping plate 41 so that the suction cup 43 is squeezed, and at the same time, the upper clamping jaw 42 clamps the test piece 2 under the action of hydraulic pressure. When the test is completed, the pump body 44 is started, and the pump body 44 injects external gas into the suction cup 43, so that the suction force of the suction cup 43 is lost, so that the test piece 2 located on the upper clamping plate 41 can be smoothly removed. By arranging the suction cup 43 on the upper clamping plate 41, the test piece 2 is easier to be installed on the upper clamping plate 41 and clamped by the upper clamping jaw 42 during installation.

[0051] Reference Figure 4 , Figure 6 and Fig. 9 The lower clamping unit 3 includes a lower clamping plate 31 arranged on the base 1, and the lower clamping plate 31 moves in the vertical direction. A plurality of lower clamping jaws 32 are arranged on the lower clamping plate 31, and the lower clamping jaws 32 move in the radial direction of the lower clamping plate 31. The lower clamping jaws 32 are driven by hydraulic pressure, and a lifting unit 33 is arranged at the lower part of the lower clamping plate 31, and the lifting unit 33 is used to drive the lower clamping plate 31 to move in the vertical direction.

[0052] The lifting unit 33 includes a second rotation driver 331 and a second guide plate 332. The second guide plate 332 is rotatably arranged at the lower part of the base 1. The second rotation driver 331 is arranged at the lower end of the second guide plate 332. The second rotation driver 331 is used to drive the second guide plate 332 to rotate. A wave groove 333 is arranged on the side wall of the second guide plate 332. A lifting block 334 is fixedly arranged at the lower part of the lower clamping plate 31. The lifting block 334 is located below the base 1. The lifting block 334 and the lower clamping plate 31 are synchronously lifted in the vertical direction. A sliding column is arranged on one side of the lifting plate, and the sliding column extends into the wave groove 333. The wave groove 333 has a highest position and a lowest position. When the second rotary driver 331 drives the second guide plate 332 to rotate, the lifting block 334 can move in the vertical direction, thereby causing the lower clamping plate 31 to move in the vertical direction. When the pressure sensor detects that the pressure reaches the initial pressure value, the second rotary driver 331 stops running. When the test is completed, the second rotary driver 331 drives the second guide plate 332 to rotate in the opposite direction. The lower clamping plate 31 descends to the initial position under the guidance of the wave groove 333. Then the lower clamping jaw 32 releases the test piece 2 on the lower clamping plate 31, so that the lower test piece 2 can be removed.

[0053] Working principle: Before the test, the test piece 2 is installed on the upper clamping unit 4 and the lower clamping unit 3 respectively. The lower clamping unit 3 can be raised and lowered on the base 1 in the vertical direction. When the test piece 2 is installed on the lower clamping unit 3, the lower clamping unit 3 is lowered to the lowest position. For the convenience of description, the test piece 2 clamped on the upper clamping unit 4 is called the upper test piece 2, and the test piece 2 clamped on the lower clamping unit 3 is called the lower test piece 2. At this time, the ends of the upper and lower test pieces 2 after the installation are completed do not contact each other, and then the lower clamping unit 3 drives the lower test piece 2 to rise. It is worth noting that when the upper clamping unit 4 clamps the upper test piece 2, the extension column on the pressing block 51 is located In the horizontal groove 523, the lower clamping unit 3 then drives the lower test piece 2 to rise. When the upper test piece 2 contacts the lower test piece 2, an initial pressure value is preset. When the initial pressure value is reached, the lower clamping unit 3 stops rising, and then the upper clamping unit 4 drives the upper test piece 2 to reciprocate in the horizontal direction. At the same time, the first guide plate 52 starts to rotate. The first guide plate 52 guides the pressing block 51 through the guide groove, so that the pressing block 51 moves from the horizontal groove 523 to the lower inclined groove 522 and then to the upper inclined groove 521, and repeats the cycle. In this way, the three stress states of teeth when people chew can be simulated, and the three chewing states are mixed together for simulation, which improves authenticity.

[0054] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A dental composite resin wear resistance testing device, comprising a base (1), a lower clamping unit (3) being arranged on the base (1), and an upper clamping unit (4) being arranged on the upper part of the lower clamping unit (3); It is characterized in that A pressing unit (5) for applying a pressing force to the upper clamping unit (4) is arranged at the upper part of the upper clamping unit (4), the pressing unit (5) comprising a pressing block (51) arranged above the upper clamping unit (4), the pressing block (51) always applying a vertical downward pressure to the upper clamping unit (4) during the process of moving in the vertical direction, a first guide plate (52) is rotatably arranged on one side of the pressing block (51), the peripheral wall of the first guide plate (52) is staggered with upper inclined grooves (521), lower inclined grooves (522) and horizontal grooves (523), the upper inclined grooves (521), lower inclined grooves (522) and horizontal grooves (523) ) together form a guide groove, an extension column is provided on one side of the pressing block (51), the extension column extends into the guide groove and slidably cooperates with the guide groove, after the first guide plate (52) rotates, when the extension column is located in the upper inclined groove (521), the pressing block (51) rises, and the pressure of the pressing block (51) on the upper clamping unit (4) decreases; when the extension column is located in the lower inclined groove (522), the pressing block (51) descends, and the pressure of the pressing block (51) on the upper clamping unit (4) increases; when the extension column is located in the horizontal groove (523), the height of the pressing block (51) remains unchanged, and the pressure of the pressing block (51) on the upper clamping unit (4) remains constant; In the continuously connected upper inclined groove (521), lower inclined groove (522) and horizontal groove (523), the length of the horizontal groove (523) is shorter than the length of the upper inclined groove (521) and the lower inclined groove (522), and the length of the upper inclined groove (521) and the lower inclined groove (522) are the same, the connection point of the upper inclined groove (521) and the lower inclined groove (522) is the first intersection point, the connection point of the upper inclined groove (521) and the horizontal groove (523) is the second intersection point, and the connection point of the lower inclined groove (522) and the horizontal groove (523) is the third intersection point, the second intersection point and the third intersection point are at the same height and are at the highest position in the guide groove, and the first intersection point is at the lowest position.

2. A dental composite resin wear resistance testing device according to claim 1, characterized in that: There is a gap between the pressing block (51) and the upper clamping unit (4), and a spring (57) is arranged in the gap in a vertical direction. The two ends of the spring (57) are respectively fixedly connected to the pressing block (51) and the upper clamping unit (4). During testing, when the extension column is located in the horizontal groove (523), the compression amount of the spring (57) is minimal.

3. A dental composite resin wear resistance testing device according to claim 2, characterized in that: A pressure sensor is provided at the connection between the pressing block (51) and the spring (57). The pressure sensor is used to monitor the real-time elastic force of the spring (57). The pressure sensor is preset with an initial pressure value. The lower clamping unit (3) can move in a vertical direction. When the elastic force of the spring (57) reaches the initial pressure value, the lower clamping unit (3) stops moving.

4. A dental composite resin wear resistance testing device according to claim 1, characterized in that: A bracket (6) is fixedly arranged on the base (1); the bracket (6) is a rotating body structure; translation grooves (61) are evenly arranged on the bracket (6); the translation grooves (61) are evenly arranged on the bracket (6) around the axis of the bracket (6); the translation grooves (61) are arc-shaped structures; a translation unit (7) is slidably arranged in the translation groove (61); the translation unit (7) and the upper clamping unit (4) move synchronously in a horizontal direction; and the translation unit (7) reciprocates in the translation groove (61) along the extension direction of the translation groove (61).

5. A dental composite resin wear resistance testing device according to claim 4, characterized in that: The translation unit (7) comprises a translation block (71) slidably arranged in the translation groove (61) along the extension direction of the translation groove (61); a translation rod (72) is vertically penetrated on the translation block (71); the translation rod (72) and the translation block (71) are slidably matched and key-connected in the vertical direction; the bottom of the translation rod (72) is connected to the upper part of the upper clamping unit (4).

6. A dental composite resin wear resistance testing device according to claim 5, characterized in that: A bellows (73) is provided between the translation block (71) and the end of the translation slot (61), a bellows (73) is provided on each side of the translation block (71), a connecting pipeline is provided on the bracket (6), the bellows (73) is connected to the connecting pipeline, hydraulic oil is provided in both the bellows (73) and the connecting pipeline, a water pump (74) is provided on the connecting pipeline, and when the translation unit (7) is running, the water pump (74) draws out the hydraulic oil in one of the bellows (73) and discharges it into the other bellows (73), and then the water pump (74) runs in the reverse direction, repeating the cycle.

7. A dental composite resin wear resistance testing device according to claim 3, characterized in that: A bellows sleeve (58) is provided on the outer sleeve of the spring (57). The bellows sleeve (58) expands and contracts synchronously with the spring (57). An air cavity is formed in the bellows sleeve (58). A switch valve (59) is provided on one side of the bellows sleeve (58). The switch valve (59) is connected to the air cavity. During testing, the switch valve (59) is in a normally open state. When the test is completed, the lower clamping unit (3) descends, and the pressure value monitored by the pressure sensor gradually decreases. When the monitored pressure value becomes zero, the switch valve (59) is closed.

8. The dental composite resin wear resistance testing device according to claim 1, characterized in that: The upper clamping unit (4) comprises an upper clamping disc (41), on which a plurality of upper clamping jaws (42) are arranged, the upper clamping jaws (42) are evenly distributed on the upper clamping disc (41) around the axis of the upper clamping disc (41), and the upper clamping jaws (42) can move in the radial direction of the clamping disc, the upper clamping jaws (42) are driven by hydraulic pressure, and a suction cup (43) is arranged at the bottom of the upper clamping disc (41), the large opening of the suction cup (43) is vertically downward, and the suction cup (43) is used to absorb the end face of the test piece (2) placed on the upper clamping disc (41).

9. The dental composite resin wear resistance testing device according to claim 1, characterized in that: The lower clamping unit (3) comprises a lower clamping plate (31) arranged on the base (1), the lower clamping plate (31) moves in a vertical direction, a plurality of lower clamping jaws (32) are arranged on the lower clamping plate (31), the lower clamping jaws (32) move in a radial direction of the lower clamping plate (31), the lower clamping jaws (32) are driven by hydraulic pressure, and a lifting unit (33) is arranged at the lower part of the lower clamping plate (31), the lifting unit (33) is used to drive the lower clamping plate (31) to move in a vertical direction.

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