Marshall test piece demolding instrument and test piece positioning device thereof

Abstract

The utility model discloses a test piece positioning device for a Marshall test piece demolding instrument, which relates to the technical field of asphalt mixture Marshall tests and comprises an optical positioning mechanism and a support, and the optical positioning mechanism is arranged on the support and can be mounted on the Marshall test piece demolding instrument through the support; the optical positioning mechanism is located above a demolding platform of the Marshall test piece demolding instrument and can irradiate annular lamplight and cross lamplight to a demolding through hole of the Marshall test piece demolding instrument, the annular lamplight is used for positioning the outer contour of a test piece and the outer contour of the demolding through hole, and the cross lamplight is used for irradiating the demolding through hole of the Marshall test piece demolding instrument. The cross-shaped lamplight is used for positioning the center of the test piece and the center of the demolding through hole, so that accurate positioning is achieved in the Marshall test piece placing process. The utility model further discloses the Marshall test piece demolding instrument, the Marshall test piece demolding instrument comprises a demolding instrument body and the test piece positioning device for the Marshall test piece demolding instrument, and the test piece positioning device for the Marshall test piece demolding instrument is installed on the demolding instrument body.

Description

Technical Field

[0001] This utility model relates to the field of Marshall testing technology for asphalt mixtures, and in particular to a Marshall specimen demolding apparatus and its specimen positioning device. Background Technology

[0002] Demolding of Marshall specimens is a crucial step in the performance testing of asphalt mixtures.

[0003] When using a traditional Marshall specimen demolding machine for demolding, the Marshall specimen (i.e., the mold with the specimen block) needs to be placed on the support platform of the demolding machine. The piston rod below the support platform rises to push the mold upwards until it is against the demolding platform above the support platform. As the piston rod continues to rise, the specimen block inside the mold is pushed out through the demolding hole of the demolding platform. The mold cannot pass through the demolding hole and remains below the demolding platform, thus completing the demolding of the Marshall specimen.

[0004] However, during the above operation, the placement deviation of the Marshall specimen often leads to inaccurate positioning between the specimen block inside the mold and the demolding through hole, which in turn causes the specimen block to be damaged during demolding, affecting the consistency and reliability of subsequent test results. Utility Model Content

[0005] The purpose of this invention is to provide a Marshall specimen demolding device and its specimen positioning device to solve the problems existing in the above-mentioned related technologies. It can achieve precise positioning during the Marshall specimen placement process, reduce human operation errors, improve demolding success rate, and enhance the consistency and reliability of subsequent test results.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a specimen positioning device for a Marshall specimen demolding apparatus, including an optical positioning mechanism and a support. The optical positioning mechanism is disposed on the support and can be mounted on the Marshall specimen demolding apparatus via the support. The optical positioning mechanism is located above the demolding platform of the Marshall specimen demolding apparatus, and the optical positioning mechanism can illuminate a circular light and a cross-shaped light at the demolding through hole of the Marshall specimen demolding apparatus. The circular light is used to position the outer contour of the specimen and the outer contour of the demolding through hole, and the cross-shaped light is used to position the center of the specimen and the center of the demolding through hole.

[0008] Preferably, the optical positioning mechanism includes a positioning lamp and a light shield. The emitting surface of the positioning lamp is arranged facing downwards, and the light shield is arranged on the emitting surface of the positioning lamp. The light shield is provided with a light-transmitting structure so that the positioning lamp can illuminate the annular light and the cross-shaped light at the demolding through hole of the Marshall specimen demolding instrument.

[0009] Preferably, the bracket includes a support plate, a clamping assembly, and a telescopic assembly. The support plate is vertically arranged, and the clamping assembly is located at the lower end of the support plate. The support plate can be mounted on one side of the demolding platform of the Marshall specimen demolding machine along its length direction via the clamping assembly. The telescopic assembly is located at the upper end of the support plate, and the positioning light is connected to the support plate via the telescopic assembly. The telescopic assembly can adjust the position of the positioning light along the width direction of the demolding platform of the Marshall specimen demolding machine.

[0010] Preferably, the clamping assembly includes an upper clamping plate, a lower clamping plate, and a first set screw. The upper clamping plate and the lower clamping plate are both fixed to the lower end of the support plate. The first set screw passes through the upper clamping plate so that the demolding platform of the Marshall specimen demolding instrument is fixed between the upper clamping plate and the lower clamping plate.

[0011] Preferably, the telescopic assembly includes a connecting plate, an insert plate, and a second set screw. The connecting plate is horizontally arranged, with one side fixedly connected to the upper end of the support plate and the other side having a slot. The slot extends along the width direction of the demolding platform of the Marshall specimen demolding machine. One end of the insert plate is inserted into the slot, and the other end is fixedly connected to the positioning light. The top of the insert plate has a strip groove along its extension direction. The second set screw passes through the top of the connecting plate and abuts against the strip groove, so that the insert plate is fixed in the slot of the connecting plate.

[0012] This utility model also provides a Marshall specimen demolding device, including a demolding device body and the aforementioned specimen positioning device for the Marshall specimen demolding device, wherein the specimen positioning device for the Marshall specimen demolding device is installed on the demolding device body.

[0013] Preferably, the demolding device body includes a hydraulic tank, a support platform, and a demolding platform. Two uprights are arranged side by side on the top of the hydraulic tank. The support platform and the demolding platform are fixed between the two uprights from bottom to top. A first through hole is provided in the middle of the support platform, and a second through hole is provided in the middle of the demolding platform. The first through hole and the second through hole are coaxially arranged. A Marshall specimen can be placed in the first through hole on the support platform. The specimen positioning device for the Marshall specimen demolding device can position the Marshall specimen and the second through hole. The hydraulic rod of the hydraulic tank can pass through the first through hole to demold the Marshall specimen on the support platform.

[0014] Preferably, both of the uprights are screw structures.

[0015] This utility model achieves the following technical advantages compared to related technologies:

[0016] The present invention provides a specimen positioning device for a Marshall specimen demolding apparatus, comprising an optical positioning mechanism and a support. In use, the optical positioning mechanism is mounted on the Marshall specimen demolding apparatus via the support. A circular and cross-shaped light source is irradiated through the demolding through-hole of the Marshall specimen demolding apparatus by the optical positioning mechanism, illuminating the Marshall specimen through the demolding through-hole. By observing whether the circular light source is located on the outer contour of the specimen, the outer contour of the specimen is positioned relative to the outer contour of the demolding through-hole. Simultaneously, by observing whether the center of the cross-shaped light source is located at the center of the specimen, the center of the specimen is positioned relative to the center of the demolding through-hole. This ensures accurate positioning of the Marshall specimen during placement, reduces human error, improves the demolding success rate, and enhances the consistency and reliability of subsequent test results. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a specimen positioning device for a Marshall specimen demolding apparatus provided in an embodiment of this utility model;

[0019] Figure 2 A schematic diagram of the overall structure of the Marshall specimen demolding apparatus provided in this embodiment of the utility model;

[0020] Figure 3 One of the partial structural schematic diagrams of the Marshall specimen demolding apparatus provided in this embodiment of the utility model;

[0021] Figure 4 A second schematic diagram of a partial structure of the Marshall specimen demolding apparatus provided in this embodiment of the present invention;

[0022] Figure 5 A schematic diagram of an existing Marshall specimen;

[0023] Figure 6 A schematic diagram showing the optical positioning mechanism provided in this embodiment of the invention illuminating a circular light and a cross-shaped light onto a Marshall specimen.

[0024] In the diagram: 01-Circular light, 02-Cross-shaped light, 03-Marshall specimen, 1-Optical positioning mechanism, 101-Positioning light, 2-Bracket, 201-Support plate, 202-Upper clamping plate, 203-Lower clamping plate, 204-First set screw, 205-Connecting plate, 206-Insertion plate, 207-Second set screw, 3-Hydraulic tank, 301-Hydraulic rod, 4-Bearing platform, 401-First through hole, 402-First threaded hole, 5-Demolding platform, 501-Second through hole, 502-Second threaded hole, 6-Upright pole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this invention is to provide a Marshall specimen demolding device and its specimen positioning device to solve the problems existing in related technologies. It can achieve precise positioning during the Marshall specimen placement process, reduce human operation errors, improve demolding success rate, and enhance the consistency and reliability of subsequent test results.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, this embodiment provides a specimen positioning device for a Marshall specimen demolding apparatus, including an optical positioning mechanism 1 and a support 2. The optical positioning mechanism 1 is disposed on the support 2 and can be installed on the Marshall specimen demolding apparatus via the support 2. The optical positioning mechanism 1 is located above the demolding platform of the Marshall specimen demolding apparatus, and the optical positioning mechanism 1 can illuminate a circular ring light 01 and a cross-shaped light 02 towards the demolding through hole of the Marshall specimen demolding apparatus. The circular ring light 01 is used to position the outer contour of the specimen and the outer contour of the demolding through hole, and the cross-shaped light 02 is used to position the center of the specimen and the center of the demolding through hole.

[0029] In this embodiment, the optical positioning mechanism 1 includes a positioning lamp 101 and a light shield. The light-emitting surface of the positioning lamp 101 is arranged facing downwards, and the light shield is arranged on the light-emitting surface of the positioning lamp 101. The light shield is provided with a light-transmitting structure so that the positioning lamp 101 can irradiate a circular light 01 and a cross-shaped light 02 onto the demolding through hole of the Marshall specimen demolding instrument. Specifically, the positioning lamp 101 in this embodiment is preferably a battery-powered LED lamp, and the light intensity can be adjusted as needed.

[0030] In this embodiment, the bracket 2 includes a support plate 201, a clamping assembly, and a telescopic assembly. The support plate 201 is vertically arranged, and the clamping assembly is located at the lower end of the support plate 201. The support plate 201 can be installed on one side of the demolding platform of the Marshall specimen demolding instrument along the length direction via the clamping assembly. The telescopic assembly is located at the upper end of the support plate 201. The positioning light 101 is connected to the support plate 201 via the telescopic assembly, and the telescopic assembly can adjust the position of the positioning light 101 along the width direction of the demolding platform of the Marshall specimen demolding instrument, so as to adapt to different models of Marshall specimen demolding instruments.

[0031] In this embodiment, the clamping assembly includes an upper clamping plate 202, a lower clamping plate 203, and a first set screw 204. The upper clamping plate 202 and the lower clamping plate 203 are both fixed to the lower end of the support plate 201. The first set screw 204 passes through the upper clamping plate 202 so that the demolding platform of the Marshall specimen demolding instrument is fixed between the upper clamping plate 202 and the lower clamping plate 203.

[0032] In this embodiment, the telescopic assembly includes a connecting plate 205, an insert plate 206, and a second set screw 207. The connecting plate 205 is horizontally arranged, with one side of the connecting plate 205 fixedly connected to the upper end of the support plate 201, and the other side having a slot. The slot extends along the width direction of the demolding platform of the Marshall specimen demolding instrument. One end of the insert plate 206 is inserted into the slot, and the other end is fixedly connected to the positioning light 101. The top of the insert plate 206 has a strip groove along its extension direction. The second set screw 207 passes through the top of the connecting plate 205 and can abut against the strip groove to fix the insert plate 206 in the slot of the connecting plate 205.

[0033] like Figures 2-4 As shown, this embodiment also provides a Marshall specimen demolding device, including a demolding device body and the above-mentioned specimen positioning device for the Marshall specimen demolding device, wherein the specimen positioning device for the Marshall specimen demolding device is installed on the demolding device body.

[0034] In this embodiment, the demolding device body includes a hydraulic tank 3, a support platform 4, and a demolding platform 5. Two uprights 6 are arranged side by side on the top of the hydraulic tank 3. The support platform 4 and the demolding platform 5 are fixed between the two uprights 6 from bottom to top. A first through hole 401 is provided in the middle of the support platform 4, and a second through hole 501 is provided in the middle of the demolding platform 5. The first through hole 401 and the second through hole 501 are coaxially arranged. The Marshall specimen 03 can be placed in the first through hole 401 on the support platform 4 (in this embodiment, an annular boss is also provided in the first through hole 401 on the support platform 4 to facilitate the initial positioning of the Marshall specimen 03). The specimen positioning device for the Marshall specimen demolding device can position the Marshall specimen 03 and the second through hole 501. The hydraulic rod 301 of the hydraulic tank 3 can pass through the first through hole 401 to demold the Marshall specimen 03 on the support platform 4.

[0035] In this embodiment, both uprights 6 are screw structures. Specifically, the support platform 4 in this embodiment is also provided with two first threaded holes 402, which are connected to the two uprights 6 respectively. Similarly, the demolding platform 5 is provided with two second threaded holes 502, which are connected to the two uprights 6 respectively. Each of the two uprights 6 is provided with a nut at its top for fixing the demolding platform 5. The threaded connection design facilitates the adjustment of the distance between the support platform 4 and the demolding platform 5, thereby adapting to the demolding of Marshall specimens 03 of different heights, reducing demolding time, and reducing the impact noise of the mold falling off due to excessive distance between the support platform 4 and the demolding platform 5.

[0036] The usage process of the Marshall specimen demolding device provided in this embodiment is as follows:

[0037] Step 1: Install the optical positioning mechanism 1 onto the demolding machine body via the clamping assembly of the bracket 2.

[0038] Step 2: Adjust the position of the optical positioning mechanism 1 by means of the telescopic component of the bracket 2 so that it can irradiate the second through hole 501 of the demolding platform 5 with the circular light 01 and the cross light 02.

[0039] Step 3, place Marshall specimen 03 (e.g.) Figure 5 (As shown) is placed at the first through hole 401 of the support platform 4.

[0040] Step 4: Turn on the positioning light 101, adjust the light intensity of the positioning light 101, and observe whether the circular light 01 is located on the outer contour of the specimen. At the same time, observe whether the center of the cross-shaped light 02 is located at the center of the specimen.

[0041] Step 5: If there is any deviation, adjust the position of Marshall specimen 03 until the position illuminated by the light meets the demolding requirements (e.g., Figure 6 (As shown).

[0042] Step 6: After the Marshall specimen 03 is accurately positioned on the support platform 4, start the hydraulic tank 3 and use the hydraulic rod 301 to lift and demold the Marshall specimen 03.

[0043] Step 7: Demolding is complete. Remove the demolded specimen.

[0044] In summary, the specimen positioning device for a Marshall specimen demolding apparatus provided by this utility model significantly improves the positioning accuracy during the Marshall specimen demolding process by utilizing optical-assisted positioning technology. This effectively reduces human error, lowers the skill requirements for operators, reduces specimen damage during demolding, thereby reducing material waste, saving costs, and enhancing the reliability of demolding data. It provides more accurate basic data for subsequent data analysis and quality control. Furthermore, the device is designed to be compatible with existing Marshall specimen demolding apparatuses, making it easy to integrate into existing equipment without requiring large-scale modifications for technological upgrades.

[0045] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A specimen positioning device for a Marshall specimen demolding apparatus, characterized in that: The device includes an optical positioning mechanism and a support. The optical positioning mechanism is mounted on the support and can be installed on a Marshall specimen demolding device via the support. The optical positioning mechanism is located above the demolding platform of the Marshall specimen demolding device and can illuminate a circular light and a cross-shaped light at the demolding through-hole of the Marshall specimen demolding device. The circular light is used to position the outer contour of the specimen and the outer contour of the demolding through-hole, and the cross-shaped light is used to position the center of the specimen and the center of the demolding through-hole.

2. The specimen positioning device for a Marshall specimen demolding apparatus according to claim 1, characterized in that: The optical positioning mechanism includes a positioning lamp and a light shield. The emitting surface of the positioning lamp is facing downwards, and the light shield is disposed on the emitting surface of the positioning lamp. The light shield is provided with a light-transmitting structure so that the positioning lamp can illuminate the annular light and the cross-shaped light at the demolding through hole of the Marshall specimen demolding instrument.

3. The specimen positioning device for a Marshall specimen demolding apparatus according to claim 2, characterized in that: The bracket includes a support plate, a clamping assembly, and a telescopic assembly. The support plate is vertically arranged, and the clamping assembly is located at the lower end of the support plate. The support plate can be mounted on one side of the demolding platform of the Marshall specimen demolding machine along its length direction via the clamping assembly. The telescopic assembly is located at the upper end of the support plate, and the positioning light is connected to the support plate via the telescopic assembly. The telescopic assembly can adjust the position of the positioning light along the width direction of the demolding platform of the Marshall specimen demolding machine.

4. The specimen positioning device for a Marshall specimen demolding apparatus according to claim 3, characterized in that: The clamping assembly includes an upper clamping plate, a lower clamping plate, and a first set screw. The upper clamping plate and the lower clamping plate are both fixed to the lower end of the support plate. The first set screw passes through the upper clamping plate so that the demolding platform of the Marshall specimen demolding instrument is fixed between the upper clamping plate and the lower clamping plate.

5. The specimen positioning device for a Marshall specimen demolding apparatus according to claim 3, characterized in that: The telescopic assembly includes a connecting plate, an insert plate, and a second set screw. The connecting plate is horizontally positioned, with one side fixedly connected to the upper end of the support plate and the other side having a slot. The slot extends along the width of the demolding platform of the Marshall specimen demolding machine. One end of the insert plate is inserted into the slot, and the other end is fixedly connected to the positioning light. The top of the insert plate has a strip groove along its extension direction. The second set screw passes through the top of the connecting plate and abuts against the strip groove, thereby fixing the insert plate in the slot of the connecting plate.

6. A Marshall specimen demolding apparatus, characterized in that: The device includes a demolding apparatus body and a specimen positioning device for a Marshall specimen demolding apparatus as described in any one of claims 1-5, wherein the specimen positioning device for the Marshall specimen demolding apparatus is mounted on the demolding apparatus body.

7. The Marshall specimen demolding apparatus according to claim 6, characterized in that: The demolding device includes a hydraulic tank, a support platform, and a demolding platform. Two uprights are arranged side by side on the top of the hydraulic tank. The support platform and the demolding platform are fixed between the two uprights from bottom to top. A first through hole is provided in the middle of the support platform, and a second through hole is provided in the middle of the demolding platform. The first through hole and the second through hole are coaxially arranged. A Marshall specimen can be placed in the first through hole on the support platform. The specimen positioning device for the Marshall specimen demolding device can position the Marshall specimen and the second through hole. The hydraulic rod of the hydraulic tank can pass through the first through hole to demold the Marshall specimen on the support platform.

8. The Marshall specimen demolding apparatus according to claim 7, characterized in that: Both of the aforementioned uprights are screw structures.

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