Sample grinding device

Abstract

The utility model discloses a sample grinding device, and relates to the technical field of detection sample treatment. According to the technical key points, the device comprises an outer shell, a supporting cover plate is installed at the top of the outer shell, an outer grinding wheel is installed in the center of the supporting cover plate, and an inner grinding wheel is coaxially arranged in the outer grinding wheel; a driving shaft is inserted in the center of the inner grinding wheel; the lower end of the driving shaft is movably sleeved with a supporting base, and the supporting base is connected with the shell on the outer side of the outer grinding wheel through a mounting lug; a horizontal rotating handle is mounted at the upper end of the driving shaft; the outer shell is provided with a screening net below the lower end of the driving shaft, and the screening net is connected with the supporting cover plate through a hanging assembly. Compared with the prior art, the sample grinding device is easy and convenient to operate, and labor is saved; and the problem that the hands of detection personnel are easy to fatigue in the grinding process can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sample processing, in particular to a sample grinding device. BACKGROUND

[0002] In the detection work, the sample often needs to be ground and crushed, and the solid sample usually has problems such as uneven particle size and random impurity distribution. The sample can be crushed to uniform fine powder by grinding, reducing local component difference, and ensuring that the detection result is more representative. For example, when detecting mycotoxin in feed, in order to avoid mycotoxin enrichment in specific particles, the sampled feed particles need to be ground and mixed uniformly to avoid deviation of the sampled detection result.

[0003] At present, the most commonly used grinding tool in the detection room is an experimental mortar. When operating, the detection personnel places the sample to be detected in the mortar, holds the pestle in the vertical state in the mortar, and repeatedly rotates in the mortar to achieve the grinding effect of the sample. After a period of grinding, in order to ensure that the particle size of the sample powder finally meets the detection requirements, the detection personnel also needs to screen the powder in the mortar with a screening net. In actual operation, since the detection personnel needs to use hand strength to control the state of the pestle in the mortar for a long time, which will cause the detection personnel's hands to be easily tired, in addition, after grinding, the detection personnel also needs to screen the sample in the mortar with a screening net, which will obviously affect the efficiency of sample preparation. CONTENT OF THE INVENTION

[0004] The present application provides a sample grinding device, which can not only improve the efficiency of sample preparation, but also reduce the fatigue of the detection personnel when preparing the sample.

[0005] The above-mentioned purpose of the present application is realized by the following technical scheme:

[0006] A sample grinding device, comprising an outer shell body provided with an opening at the top, a support cover plate being detachably installed in the opening at the top of the outer shell body, an outer grinding wheel being installed at the center of the support cover plate, an inner grinding wheel being coaxially arranged inside the outer grinding wheel, and a gap between the tooth surface on the outer side of the inner grinding wheel and the tooth surface on the inner side of the outer grinding wheel being matched with the required sample particle size;

[0007] A driving shaft is vertically and fixedly connected between the center of the inner grinding wheel and the outer grinding wheel;

[0008] The lower end of the drive shaft extends into the outer shell through the inner grinding wheel, and a support base is movably sleeved on the part of the drive shaft in the outer shell. One mounting lug is fixedly arranged on each of the opposite sides of the support base along the radial direction, and the mounting lug is connected to the shell outside the outer grinding wheel by screws.

[0009] A screening net is arranged below the lower end of the drive shaft of the outer shell, and the screening net is connected to the support cover plate by a suspension assembly.

[0010] Further, a horn-shaped collecting hopper is fixedly arranged at the upper end of the outer grinding wheel.

[0011] Further, an upper positioning ring is arranged at the center of the collecting hopper, the upper positioning ring is sleeved on the drive shaft and rotationally connected therebetween, one standing lug is fixedly arranged on each of the opposite sides of the upper positioning ring along the radial direction, and the mutually distal ends of the two standing lugs are fixedly connected to the inner side wall of the collecting hopper.

[0012] Further, the suspension assembly includes two first mounting screws, and the two first mounting screws are arranged on each of the opposite sides of the outer grinding wheel in the outer shell. One end of the first mounting screw is inserted into the mounting hole on the outer grinding wheel shell from below to above through the support cover plate, and the first mounting screw is threadedly connected with the support cover plate and the mounting hole.

[0013] The other end of the first mounting screw is fixedly provided with a square cross-sectioned screwing part, the lower end of the screwing part is fixedly provided with a second mounting screw with an outer diameter smaller than that of the first mounting screw, a mounting cross bar is sleeved on the second mounting screw, and a nut is arranged below the mounting cross bar and threadedly connected with the second mounting screw.

[0014] One suspension rod is fixedly connected to the lower side of each end of the mounting cross bar, and the lower end of the suspension rod is welded to the outer side wall of the frame part of the screening net.

[0015] Further, a vibration assembly is arranged inside the screening net, and the vibration assembly can periodically vibrate the screening net during the sample grinding process.

[0016] Further, the vibration assembly includes a plurality of extrusion protrusions, the plurality of extrusion protrusions are irregularly distributed on the inner side wall of the frame part of the screening net along the circumferential direction, an installation sleeve is arranged at the center of the frame part of the screening net, the height of the installation sleeve in the vertical direction is the same as the height of the extrusion protrusions, and the installation sleeve is detachably installed on the lower end of the drive shaft.

[0017] A plurality of knocking rods are fixedly installed on the outer side of the mounting sleeve and are distributed radially on the outer side of the mounting sleeve;

[0018] A guide rod is movably inserted into the end of the knocking rod away from the mounting sleeve, a knocking head is fixedly connected to the end of the guide rod away from the knocking rod, and a spring is sleeved on the part of the guide rod between the knocking head and the knocking rod, so that the knocking head can abut against the inner side wall of the screen frame in a normal state.

[0019] Further, an outer thread is arranged on the lower end of the drive shaft, a limiting ring is fixedly installed on the upper edge of the outer thread part of the lower end of the drive shaft, there is a gap between the limiting ring and the lower end of the outer grinding wheel, the mounting sleeve is sleeved on the outer thread part of the lower end of the drive shaft, and a nut is arranged below the mounting sleeve and is threadedly connected with the outer thread part of the lower end of the drive shaft.

[0020] Further, an opening is arranged on the lower end of one of the side walls of the shell, and a material collecting drawer is movably inserted into the opening.

[0021] In summary, the present application has at least one of the following beneficial technical effects:

[0022] The support cover plate of the present application is fixedly installed with an outer grinding wheel, and an inner grinding wheel matched with the outer grinding wheel is arranged on the inner side of the outer grinding wheel. When the sample is needed to be ground, the sample is added into the outer grinding wheel, and the inner grinding wheel is rotated in the outer grinding wheel by rotating the horizontal handle to drive the shaft. The sample is ground by the inner grinding wheel and the outer grinding wheel, and the ground sample powder falls into the screen below, and the sample powder with a required particle size continues to fall, while the sample powder with a large particle size remains on the screen. Compared with the prior art, the sample is automatically ground by the inner grinding wheel and the outer grinding wheel on the drive shaft, which is not only simple and convenient to operate, but also saves labor. The drive shaft is supported and positioned by the support bottom, so that the verticality of the drive shaft does not need to be maintained during the grinding process, thereby effectively improving the problem that the hands of the detection personnel are easily tired during the grinding process. The ground sample powder automatically falls on the screen, and the screen automatically screens the qualified sample powder. Compared with the prior art, the sample powder needs to be screened by the detection personnel after grinding, and the grinding device of the present application is obviously more efficient. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 is a schematic diagram of the overall structure of the present application;

[0025] Figure 2 is a schematic diagram of the structure of the present application after the aggregate drawer is pulled out on the basis of Figure 1

[0026] Figure 3 is a schematic diagram of the structure of the present application after part of the outer shell, the support cover plate and the outer grinding wheel are cut open on the basis of Figure 2

[0027] Figure 4 is a schematic diagram of part of the structure of the present application after the outer shell is removed;

[0028] Figure 5 is a schematic diagram of the structure of the present application after the support cover plate, the outer grinding wheel, the support base and the positioning ring and other related components are removed on the basis of Figure 4

[0029] Figure 6 is a schematic diagram of part of the structure of the present application with the knocking rod provided with a knocking head at one end.

[0030] Reference signs: 1, outer shell; 2, support cover plate; 3, outer grinding wheel; 4, inner grinding wheel; 5, drive shaft; 6, support base; 7, mounting ear; 8, horizontal handle; 9, screening net; 10, suspension assembly; 101, first mounting screw; 102, mounting hole; 103, screwing part; 104, second mounting screw; 105, mounting cross bar; 106, suspension rod; 11, aggregate hopper; 12, positioning ring; 13, standing ear; 14, vibration assembly; 141, extrusion protrusion; 142, mounting sleeve; 143, knocking rod; 144, guide rod; 145, knocking head; 146, spring; 15, limiting ring; 16, aggregate drawer. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the scope of protection of the present application. ​​​

[0032] As Figures 1-4 shown, a sample grinding device disclosed in the present application comprises an outer shell 1 with an opening at the top, a support cover plate 2 is detachably installed in the opening at the top of the outer shell 1, an outer grinding wheel 3 is installed at the center of the support cover plate 2, an inner grinding wheel 4 is coaxially arranged inside the outer grinding wheel 3, and the tooth surface on the outer side of the inner grinding wheel 4 and the tooth surface on the inner side of the outer grinding wheel 3 have a gap matching the required sample particle size;

[0033] A driving shaft 5 is vertically inserted through the center of the inner grinding wheel 4 and fixedly connected therebetween;

[0034] The lower end of the driving shaft 5 extends into the outer shell 1 after passing through the inner grinding wheel 4, a support base 6 is movably sleeved on the part of the driving shaft 5 located in the outer shell 1, one of the opposite sides of the support base 6 along its radial direction is fixedly provided with a mounting lug 7, and the mounting lug 7 is connected to the outer side of the shell of the outer grinding wheel 3 through screws; the upper end of the driving shaft 5 is located directly above the center of the outer grinding wheel 3, and a horizontal handle 8 is installed at the upper end of the driving shaft 5 through screws;

[0035] A screening net 9 is arranged below the lower end of the driving shaft 5 of the outer shell 1, and the screening net 9 is connected to the support cover plate 2 through a hanging assembly 10.

[0036] In the above embodiment, the structures of the outer grinding wheel 3 and the inner grinding wheel 4 of the present application can be referred to the Chinese patent document with the application number 202323445007.8. When the inner grinding wheel 4 rotates, the sample will move to the tooth groove of the outer grinding wheel 3 under the action of centrifugal force, and be extruded and sheared in the gap between the tooth surfaces to achieve the grinding effect.

[0037] The present application is installed with a support base 6 at the lower end of the driving shaft 5 at the center of the inner grinding wheel 4, and the support base 6 is located below the center position of the lower end of the outer grinding wheel 3, one of the opposite sides of the support base 6 is fixedly connected to the shell of the outer grinding wheel 3 through the mounting lug 7, which not only ensures that the inner grinding wheel 4 and the outer grinding wheel 3 have a stable gap, but also provides the necessary support for the inner grinding wheel 4 and the driving shaft 5 through the shell of the outer grinding wheel 3. In order to make the detection personnel rotate the driving shaft 5 more labor-saving when grinding the sample, a rotating bearing can be installed on the support base 6 at the space where the driving shaft 5 is assembled.

[0038] The upper end of the driving shaft 5 of the application is connected with a horizontal rotating handle 8. When the person in charge needs to grind the sample, the handle at the end of the horizontal rotating handle 8 is rotated to easily drive the inner grinding wheel 4 to rotate in the outer grinding wheel 3 through the driving shaft 5, so that the sample to be detected can be efficiently ground. The sample powder generated by grinding will fall from the gap between the inner grinding wheel 4 and the outer grinding wheel 3 under the action of gravity. The application is provided with a screening net 9 directly below the lower end of the driving shaft 5. The area of the screening net 9 can accommodate all the sample powder falling from the gap between the inner grinding wheel 4 and the outer grinding wheel 3. When the falling sample powder contacts the screening area of the screening net 9, the screening area of the screening net 9 will leave the particles whose particle size does not meet the detection requirements, and the particles with appropriate particle size will smoothly pass through the mesh holes of the screening area of the screening net 9. Finally, all the appropriate sample powder will be collected at the bottom of the outer shell 1. The outer shell 1 and the support cover plate 2 of the application are in detachable connection. The person in charge can take out the ground sample powder from the inside of the outer shell 1 by detaching the support cover plate 2 and the outer shell 1.

[0039] Compared with the way of grinding the sample by using a mortar in the prior art, the grinding device of the application can automatically realize the grinding effect of the sample by the cooperation of the inner grinding wheel 4 and the outer grinding wheel 3 through the rotation of the horizontal rotating handle 8 during use. The operation is not only simple and convenient, but also labor-saving. The driving shaft 5 is supported and positioned by the support bottom, so that the person in charge can save the trouble of continuously maintaining the verticality during the grinding process, thereby effectively improving the problem that the hands of the person in charge are easily tired during the grinding process. Moreover, the sample powder ground by the application will automatically fall on the screening net 9, and the screening net 9 will automatically screen out the qualified sample powder. Compared with the scheme that the person in charge needs to hold the screening net to screen the sample powder after grinding in the prior art, the grinding device of the application is obviously more efficient in use.

[0040] Further, as shown in Figures 1-4 The upper end of the outer grinding wheel 3 is fixedly installed with a horn-shaped material collecting hopper 11.

[0041] In the above embodiment, the small-diameter end of the material collecting hopper 11 of the application is connected with the large-diameter end of the outer grinding wheel 3, and the large-diameter end of the material collecting hopper 11 is located above. In this way, when the person in charge needs to grind the sample, it is convenient for him / her to quickly add the sample to be ground, and the temporary storage capacity of the equipment of the application for the sample to be ground can be improved.

[0042] Further, as shown in Figure 1 The center of the material collecting hopper 11 is provided with an upper positioning ring 12. The upper positioning ring 12 is sleeved on the driving shaft 5 and is rotationally connected therebetween. The upper positioning ring 12 is fixedly provided with one standing ear 13 on one opposite side along the radial direction thereof. The mutually far ends of the two standing ears 13 are fixedly connected with the inner side wall of the material collecting hopper 11.

[0043] In the above embodiment, the upper positioning ring 12 added on the driving shaft 5 is fixedly installed in the collecting hopper 11 through the standing ear 13, and the upper positioning ring 12 is rotationally connected with the corresponding position of the driving shaft 5. Thus, in cooperation with the support base 6, two limiting support points can be provided for the driving shaft 5, so as to ensure the stability and reliability of the driving shaft 5 in the rotating process.

[0044] Further, as shown in Figures 3-5 The suspension assembly 10 comprises two first mounting screws 101, which are respectively arranged at one of the opposite sides of the outer grinding wheel 3 in the outer shell 1. One end of the first mounting screw 101 is inserted into the mounting hole 102 on the outer shell of the outer grinding wheel 3 from bottom to top after passing through the support cover plate 2, and the first mounting screw 101 is threadedly connected with the support cover plate 2 and the mounting hole 102.

[0045] The other end of the first mounting screw 101 is fixedly provided with a square cross-section screwing part 103, the lower end of which is fixedly provided with a second mounting screw 104 with an outer diameter smaller than that of the first mounting screw 101. The second mounting screw 104 is sleeved with a mounting cross bar 105, and the lower side of the mounting cross bar 105 is provided with a nut threadedly connected with the second mounting screw 104.

[0046] The lower side of each end of the mounting cross bar 105 is fixedly connected with a suspension rod 106, and the lower end of the suspension rod 106 is welded with the outer side wall of the frame part of the screening net 9.

[0047] In the above embodiment, one mounting hole 102 is fixedly arranged on one of the opposite sides of the outer shell of the outer grinding wheel 3 along the radial direction thereof, and the inside of the mounting hole 102 is provided with an internal thread. A hole with the same specification as the mounting hole 102 is also arranged at the corresponding position of the support cover plate 2. When the user needs to suspend the screening net 9 directly below the outer grinding wheel 3, the user can first screw two first mounting screws 101 into the two mounting holes 102 from bottom to top. The screwing part 103 at the head of the first mounting screw 101 is convenient for the user to use a special wrench to screw the first mounting screw 101. After the first mounting screw 101 is fixed, the user can sleeve the mounting cross bar 105 on the first mounting screw 101, and then screw the nut into the first mounting screw 101 below the mounting cross bar 105 to fix the position of the horizontal cross bar. Since the mounting cross bar 105 is fixedly connected with the outer side wall of the frame part of the screening net 9 through the suspension rod 106, after the mounting cross bar 105 is installed, the mounting cross bar 105 can complete the suspension of the screening net 9 below the outer grinding wheel 3 through the suspension rod 106, so as to ensure that the screening net 9 can accurately receive the sample powder falling from above.

[0048] Further, as shown in Figures 3-5As shown, the inside of the screening net 9 is provided with a vibration assembly 14, which can periodically vibrate the screening net 9 during the sample grinding process.

[0049] In the above embodiment, if only the weight of the ground powder is relied on to screen it on the screening net 9, the mesh holes of the screening area of the screening net 9 are easy to be blocked after a long time, which will affect the screening effect. Therefore, the vibration assembly 14 is additionally arranged inside the screening net 9 to reduce the risk of mesh hole blockage of the screening net 9 by forcing it to vibrate, thereby improving the screening efficiency of the grinding process.

[0050] Further, as shown in Figure 5 and Figure 6 The vibration assembly 14 includes a plurality of extrusion protrusions 141, which are irregularly distributed along the circumference of the inner side wall of the frame part of the screening net 9. A mounting sleeve 142 is arranged at the center of the frame part of the screening net 9, and the height of the mounting sleeve 142 in the vertical direction is the same as that of the extrusion protrusions 141. The mounting sleeve 142 is detachably mounted on the lower end of the driving shaft 5.

[0051] A plurality of knocking rods 143 are fixedly mounted on the outer side of the mounting sleeve 142, and are radially distributed on the outer side of the mounting sleeve 142.

[0052] The knocking rods 143 are movably inserted with a guide rod 144 at the end away from the mounting sleeve 142. The end of the guide rod 144 away from the knocking rod 143 is fixedly connected with a knocking head 145. A spring 146 is sleeved on the part of the guide rod 144 between the knocking head 145 and the knocking rod 143. In the normal state, the spring 146 can make the knocking head 145 abut against the inner side wall of the frame part of the screening net 9.

[0053] In the above embodiments, the mounting sleeve 142 of this application is installed at the lower end of the drive shaft 5. The mounting sleeve 142 has multiple horizontal striking rods 143 arranged circumferentially. Thus, during the rotation of the drive shaft 5, the mounting sleeve 142 can rotate the multiple striking rods 143 together with it. A guide rod 144 is movably inserted at the end of the striking rod 143 away from the mounting sleeve 142 and connected to a striking head 145. A spring 146 is sleeved on the portion of the guide rod 144 between the striking head 145 and the mounting sleeve 142. One end of the spring 146 is fixedly connected to the striking rod 143, and the other end is fixedly connected to the striking head 145. In normal operation, the spring 146 allows the striking head 145 to contact the inner part of the frame of the screening screen 9. With the sidewall in contact, and the vertical height of the striking rod 143 equal to the height of the pressing protrusion 141 on the frame of the screening screen 9, when the striking rod 143 rotates together with the drive shaft 5, the striking head 145 moves from the inner wall of the frame of the screening screen 9 to the pressing protrusion 141. The pressing protrusion 141 exerts a pressing force on the striking head 145, causing the striking head 145 to press the spring 146 towards the striking rod 143 under the action of the guide rod 144. When the striking rod 143, carrying the striking head 145, leaves the pressing protrusion 141, the spring force of the spring 146 is quickly released, causing the striking head 145 to strike the inner wall of the frame of the screening screen 9. This causes the screening screen 9, suspended below the outer grinding wheel 3, to vibrate. This allows the striking head 145 to simultaneously vibrate the screening screen 9 during the grinding process, effectively improving the screening efficiency of the screening screen 9.

[0054] In this application, multiple extrusion protrusions 141 are irregularly distributed along the circumference of the inner wall of the screen mesh 9 frame. Although these extrusion protrusions 141 are all set at the same height on the inner wall of the screen mesh 9 frame along the circumference of the screen mesh 9, the spacing between them is irregular. In this way, when multiple striking heads 145 strike the inner wall of the screen mesh 9 frame, the situation where multiple extrusion heads strike the inner wall of the screen mesh 9 frame at the same time can be effectively avoided, so as to prevent the partial components of the impact force in different directions from canceling each other out and affecting the vibration effect of the screen mesh 9.

[0055] Furthermore, such as Figure 5 As shown, the lower end of the drive shaft 5 has an external thread on its outer side. A limiting ring 15 is fixedly installed on the upper edge of the external thread portion at the lower end of the drive shaft 5. There is a gap between the limiting ring 15 and the lower end of the outer grinding wheel 3. The mounting sleeve 142 is sleeved on the external thread portion at the lower end of the drive shaft 5. A nut is provided below the mounting sleeve 142. The nut is threadedly connected to the external thread portion at the lower end of the drive shaft 5.

[0056] In the above embodiment, after the mounting sleeve 142 of the application is mounted on the externally threaded portion at the lower end of the drive shaft 5, the limiting ring 15 along the externally threaded portion of the drive shaft 5 can position the mounting sleeve 142, so that when the mounting sleeve 142 is fixed by the nut later, the mounting sleeve 142 will not abut against the lower end of the outer grinding wheel 3, thereby increasing the resistance when the drive shaft 5 rotates. Since the mounting sleeve 142 is mounted on the externally threaded portion at the lower end of the drive shaft 5 by the nut, when the subsequent knocking rod 143 and other components have problems, the tester can quickly disassemble them for maintenance or replacement.

[0057] Further, as shown in Figure 1 and Figure 2 , the lower end of one side wall of the outer shell 1 is provided with an opening, and a material collecting drawer 16 is movably inserted in the opening.

[0058] In the above embodiment, the material collecting drawer 16 is provided on one side wall of the outer shell 1, which can receive the sample powder screened out by the screening net 9. Thus, after grinding, the tester only needs to take out the material collecting drawer 16 to obtain the screened sample powder, which is more convenient to use than opening the support cover plate 2 and pouring the screened sample powder out of the outer shell 1.

[0059] The implementation principle of the embodiment is that when the tester needs to grind the sampled sample before detection, the sampled sample can be first added to the material collecting hopper 11, and the sample will automatically slide along the inner wall of the material collecting hopper 11 to between the outer grinding wheel 3 and the inner grinding wheel 4. Next, the tester rotates the drive shaft 5 with the inner grinding wheel 4 in the outer grinding wheel 3 by rotating the horizontal handle 8, so as to grind the sampled sample by the inner grinding wheel 4 and the outer grinding wheel 3. The ground sample powder will fall into the screening net 9 below, and the sample powder meeting the required particle size will continue to fall, while the sample powder with large particle size will remain on the screening net 9. Since the screening net 9 is provided with the material collecting drawer 16 below, the tester can obtain the required sample powder by pulling out the material collecting drawer 16 after grinding. The sample grinding device of the application is not only simple and convenient to operate, but also labor-saving compared with the prior art. Moreover, the problem of hand fatigue of the tester during the grinding process is effectively improved. In addition, the ground sample powder of the application will automatically fall on the screening net 9, and the screening net 9 will automatically screen out the qualified sample powder. Compared with the prior art scheme in which the tester needs to hold the screening net to screen the sample powder after grinding, the grinding device of the application is obviously more efficient to use.

[0060] Further, the application is also provided with a mounting sleeve 142 at the lower end of the driving shaft 5, and a plurality of knocking rods 143 are arranged at the circumferential side of the mounting sleeve 142. When the knocking head 145 moves from the inner wall of the frame part of the screening net 9 to the extrusion protrusion 141 while the knocking rod 143 rotates with the driving shaft 5, the extrusion protrusion 141 will generate an extrusion force to the knocking head 145, and the knocking head 145 will extrude the spring 146 in the direction of the knocking rod 143 under the action of the guide rod 144. When the knocking rod 143 with the knocking head 145 leaves the extrusion protrusion 141, the spring force will be rapidly released, so as to drive the knocking head 145 to impact the inner wall of the frame of the screening net 9. In this way, the screening net 9 suspended below the outer grinding wheel 3 can be vibrated. In the process of detection, the knocking head 145 can be used to realize the vibration of the screening net 9, so as to effectively improve the screening effect of the screening net 9.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, and are not limited thereto; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or part or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A sample grinding device, characterized by: The utility model provides a kind of sample grinding device, including the outer shell (1) with opening in top, detachable mounting support cover plate (2) in the opening of the top of the outer shell (1), the center of the support cover plate (2) is equipped with outer grinding wheel (3), the inside coaxial of the outer grinding wheel (3) is equipped with inner grinding wheel (4), the gap between the tooth surface of the outer side of the inner grinding wheel (4) and the tooth surface of the inner side of the outer grinding wheel (3) has with the granularity of required sample particle matching; The center of the inner grinding wheel (4) is vertically penetrated with a driving shaft (5) and fixedly connected between them; The lower end of the driving shaft (5) extends to the outer shell (1) after passing through the inner grinding wheel (4), and a support base (6) is movably sleeved on the part of the driving shaft (5) in the outer shell (1), one mounting lug (7) is respectively fixed on one of the opposite sides of the support base (6) in the radial direction, and the mounting lug (7) is connected to the outer side of the outer grinding wheel (3) by screws; the upper end of the driving shaft (5) is located directly above the center of the outer grinding wheel (3), and a horizontal handle (8) is installed on the upper end of the driving shaft (5) by screws; The outer shell (1) is provided with a screening net (9) below the lower end of the driving shaft (5), and the screening net (9) is connected to the support cover plate (2) by a suspension assembly (10).

2. The sample grinding device of claim 1, wherein: A horn-shaped collecting hopper (11) is fixedly installed at the upper end of the outer grinding wheel (3).

3. The sample grinding apparatus of claim 2, wherein: An upper positioning ring (12) is provided at the center of the collecting hopper (11), the upper positioning ring (12) is sleeved on the driving shaft (5) and rotationally connected therebetween, one of the opposite sides of the upper positioning ring (12) in the radial direction is respectively fixed with one standing lug (13), and the mutually far ends of the two standing lugs (13) are fixedly connected to the inner side wall of the collecting hopper (11).

4. The sample grinding apparatus of claim 1, wherein: The suspension assembly (10) includes two first mounting screws (101), the two first mounting screws (101) are respectively arranged on one of the opposite sides of the outer grinding wheel (3) in the outer shell (1); one end of the first mounting screw (101) is inserted into a mounting hole (102) on the outer shell of the outer grinding wheel (3) from below to above through the support cover plate (2), and the first mounting screw (101) is threadedly connected with the support cover plate (2) and the mounting hole (102); The other end of the first mounting screw (101) is fixedly provided with a square-shaped screwing part (103), the lower end of the screwing part (103) is fixedly provided with a second mounting screw (104) with an outer diameter smaller than that of the first mounting screw (101), a mounting cross bar (105) is sleeved on the second mounting screw (104), and a nut is provided below the mounting cross bar (105) and threadedly connected with the second mounting screw (104); The lower sides of the two ends of the mounting cross bar (105) are respectively fixedly connected with one suspension rod (106), and the lower ends of the suspension rods (106) are welded to the outer side wall of the frame part of the screening net (9).

5. The sample grinding apparatus of claim 4, wherein: The screen (9) is internally provided with a vibrating assembly (14), which can periodically vibrate the screen (9) during the sample grinding process.

6. The sample grinding apparatus of claim 5, wherein: The vibrating assembly (14) comprises a plurality of extrusion protrusions (141) irregularly distributed along the circumference of the inner side wall of the screen (9) frame part, and a mounting sleeve (142) is arranged at the center of the screen (9) frame part, and the mounting sleeve (142) has the same height as the extrusion protrusions (141) in the vertical direction, and the mounting sleeve (142) is detachably mounted on the lower end of the drive shaft (5); A plurality of knocking rods (143) are fixedly mounted on the outer side of the mounting sleeve (142), and the knocking rods (143) are radially distributed on the outer side of the mounting sleeve (142); A guide rod (144) is movably arranged in one end of the knocking rod (143) away from the mounting sleeve (142), and a knocking head (145) is fixedly connected to one end of the guide rod (144) away from the knocking rod (143), and a spring (146) is sleeved on the part of the guide rod (144) between the knocking head (145) and the knocking rod (143), and the spring (146) can make the knocking head (145) abut against the inner side wall of the screen (9) frame part in the normal state.

7. The sample grinding apparatus of claim 6, wherein: The lower end of the drive shaft (5) is externally threaded, and a limiting ring (15) is fixedly mounted on the upper edge of the externally threaded part of the lower end of the drive shaft (5), and the limiting ring (15) is spaced apart from the lower end of the outer grinding wheel (3), the mounting sleeve (142) is sleeved on the externally threaded part of the lower end of the drive shaft (5), and a nut is arranged below the mounting sleeve (142), which is threadedly connected with the externally threaded part of the lower end of the drive shaft (5).

8. The sample grinding device of any one of claims 1-7, wherein: The lower end of one side wall of the outer shell (1) is provided with an opening, and a material collecting drawer (16) is movably arranged in the opening.

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