Weightlessness scale convenient to assemble

Abstract

The utility model relates to a weightlessness scale convenient to assemble. The weightlessness scale comprises a hopper, a top cover and a spherical head, the top cover and the hopper are fixedly connected together through an automatic clamping mechanism; the automatic clamping mechanism comprises a servo motor, a main shaft of the servo motor is vertically downward, and a driving bevel gear is arranged at the lower end of the main shaft; a clamping device is arranged on the top cover and comprises a lead screw, a driven bevel gear is arranged at the end, close to the center of the top cover, of the lead screw, and the driven bevel gear is meshed with the driving bevel gear in a tooth shape. A lead screw nut is arranged on the lead screw, and a holding device fixedly connected with the lead screw nut is arranged below the lead screw nut; the hopper and the spherical head are fixedly connected together through a fast-assembling clamp. According to the weightlessness scale convenient to assemble, rapid positioning and installation of the top cover, the hopper and the spherical head can be achieved through the positioning columns and the positioning holes, the operation stability after equipment disassembly and assembly is guaranteed, the universality is high, the assembly efficiency is improved, and industrial popularization is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a loss of weight scale, especially a loss of weight scale convenient to assemble. BACKGROUND

[0002] The loss of weight scale is an automatic weighing device for realizing high-precision continuous quantitative feeding through static weighing, which can reliably, accurately and stably feed dry bulk materials such as powder, granule and sheet, reduce waste of materials and improve consistency of the mixture.

[0003] According to the material quality of the conveyed material, the top cover, the hopper and the spherical head need to be disassembled after conveying one kind of material for cleaning, and the installation after cleaning is manually operated, so there is a certain error and installation defect during manual assembly, which leads to instability of the loss of weight scale and affects work. SUMMARY

[0004] The utility model solves the technical problem that the existing loss of weight scale has low assembly precision and poor stability after disassembly.

[0005] In order to solve the above technical problem, the utility model is realized by the following technical scheme:

[0006] A loss-in-weight scale with easy assembly, comprising a hopper, a top cover and a spherical head; the top cover is arranged on the top of the hopper, and is provided with a feed port communicating with the inner cavity of the hopper; the spherical head is arranged at the bottom of the hopper; the top cover and the hopper are fixedly connected together by an automatic clamping mechanism; the automatic clamping mechanism comprises a servo motor, which is fixedly mounted on the top surface of the top cover through a base, with its main shaft pointing vertically downward, and a driving helical gear being provided at the lower end of the main shaft, and the servo motor can drive the driving helical gear to rotate clockwise or counterclockwise through the main shaft; a clamping device is provided on the top cover, and the clamping device comprises a lead screw movably arranged on the top cover, The lead screw is arranged horizontally, and one end of the lead screw close to the center of the top cover is provided with a driven helical gear fixedly connected to it, and the driven helical gear is meshed with the active helical gear. The active helical gear can drive the driven helical gear to rotate, thereby driving the lead screw to rotate synchronously; one end of the lead screw away from the driven helical gear extends to the outside of the top cover, and the lead screw is provided with a lead screw nut meshed with its teeth. A clamping device fixedly connected to it is provided below the lead screw nut, and the clamping device can move on the lead screw with the lead screw nut, and the edge of the fitting surface of the top cover and the hopper is clamped by the clamping device; the hopper and the spherical head are fixedly connected together by a quick-release clamp.

[0007] Preferably, the portion of the lead screw from one end connected to the driven helical gear to the middle section thereof is smooth, and an external thread is provided on the outside of the other section of the lead screw opposite to the smooth surface, and the lead screw nut is screwed onto the external threaded portion, and at least two bearings fixedly connected to the smooth surface are sleeved on the smooth surface, and the bearings are fixedly mounted on the top cover through a bearing seat.

[0008] Preferably, a guide sleeve is provided below the screw and is parallel to the screw above and below. The guide sleeve is fixedly connected to the bearing seat. A guide rod is provided in the guide sleeve and is slidably matched with the guide rod. The end of the guide rod away from the driven helical gear is fixedly connected to the lower end of the screw nut, and the guide rod can move synchronously with the screw nut.

[0009] Preferably, the clamping device includes a lifting arm, which is fixedly connected to the bottom of the screw nut, and an upper cantilever is provided on the side of the lifting arm corresponding to the edge of the top cover. The upper cantilever is provided with an upper clamping block for clamping the top cover and the upper edge of the hopper, and a clamping groove is provided on the side of the upper clamping block corresponding to the top cover and the upper edge of the hopper; a lower cantilever is provided at the bottom of the lifting arm, and the lower cantilever corresponds to the upper cantilever up and down, and a cylinder is provided at the bottom of the lower cantilever, and the cylinder is vertically arranged, and the outer end of its piston rod passes through the lower cantilever upward and corresponds to the clamping groove up and down, and the outer end of the piston rod is fixedly provided with a lower clamping block.

[0010] Preferably, a limit stop is provided on one end of the lead screw away from the driven helical gear, and the diameter of the limit stop is larger than the diameter of the lead screw.

[0011] As preferred, the clamping device has at least three groups, which are in a circular array centered by a servo motor on the top of the top cover.

[0012] As preferred, the top of the hopper is provided with an outwardly turned upper edge joint along the edge part of its outer side, the upper edge joint is provided with an upper positioning column, the top cover is provided with an upper positioning hole corresponding to the number and position of the upper positioning column, and the upper positioning column can be inserted into the upper positioning hole.

[0013] As preferred, the bottom of the hopper is provided with an outwardly turned lower edge joint along the edge part of its outer side, the top of the spherical head is provided with an outwardly turned positioning joint along the edge part of its outer side, the lower edge joint and the positioning joint are the same structure and correspond to each other, the positioning joint is provided with a lower positioning column, the lower edge joint is provided with a lower positioning hole corresponding to the number and position of the lower positioning column, and the lower positioning column can be inserted into the lower positioning hole.

[0014] As preferred, the top of the top cover is provided with an ear.

[0015] Compared with the prior art, the weightlessness scale has the advantages that: the weightlessness scale is convenient to assemble, the positioning column and the positioning hole can realize the rapid positioning and installation of the top cover, the hopper and the spherical head, the assembly precision is high, the stability is good, the stability of the equipment after disassembly is ensured, the automatic clamping mechanism can realize the rapid clamping of the top cover and the hopper, the reliability is good, the clamping between the top cover and the hopper of different diameters can be adapted, the universality is strong, the clamping operation is simple and convenient, the assembly efficiency of the top cover, the hopper and the spherical head can be improved, and the weightlessness scale is convenient for industry promotion. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0017] Figure 1 is a three-dimensional structure schematic diagram of the weightlessness scale convenient to assemble of the present application;

[0018] Figure 2 is a top view structure schematic diagram of the weightlessness scale convenient to assemble of the present application;

[0019] Figure 3 is Figure 2 the structure sectional view of A-A in FIG.

[0020] Figure 4is Figure 3 An enlarged view of the structure of the middle B;

[0021] Figure 5 is Figure 3 An enlarged view of the top partial structure;

[0022] Figure 6 is a three-dimensional structure schematic view of the automatic clamping mechanism in the weightlessness scale convenient to assemble;

[0023] Figure 7 is a side structure schematic view of the automatic clamping mechanism in the weightlessness scale convenient to assemble;

[0024] Figure 8 is a structure schematic view of the holding device in the weightlessness scale convenient to assemble.

[0025] In the figure: 1, hopper; 11, upper flange joint; 12, lower flange joint; 13, lower positioning hole; 14, upper positioning column; 2, top cover; 21, feed inlet; 22, lifting lug; 23, base; 3, spherical head; 31, positioning joint; 32, lower positioning column; 4, automatic clamping mechanism; 41, servo motor; 42, main shaft; 43, driving bevel gear; 44, lead screw; 441, lead screw nut; 4411, hanging arm; 4412, upper cantilever; 4413, lower cantilever; 4414, upper clamping block; 44141, clamping groove; 4415, lower clamping block; 442, limit block; 443, air cylinder; 4431, air cylinder piston rod; 444, guide rod; 445, guide sleeve; 45, driven bevel gear; 46, bearing seat; 5, quick-mounting clamp. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the application. It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of the application, it should be explained that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product of the application when it is usually placed, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the application. In addition, the terms "first", "second" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0028] In addition, if the terms "horizontal", "vertical" and the like appear, it does not mean that the component must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure or component must be completely horizontal, but can be slightly inclined.

[0029] In the description of the embodiments of the application, "a plurality of" represents at least 2.

[0030] In the description of the embodiments of the application, it should be further explained that, unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0031] Embodiments

[0032] Please refer to the drawings in the description Figures 1 to 3 shown in the description Figures 1 to 3The utility model discloses a kind of convenient assembly's weightlessness scales, including hopper 1, top cover 2 and spherical head 3;The top cover 2 is detachably arranged at the top of hopper 1, and the top cover 2 is provided with the feed inlet 21 being communicated with the inner cavity of hopper 1 and the lifting lug 22 for lifting, the lifting lug 22 has two, and the two lifting lug 22 is symmetrically arranged in the part of top cover 2 top near edge with the top surface center of top cover 2 as symmetry point, guarantee the stability of top cover 2 when lifting;To facilitate the accurate butt joint of top cover 2 on hopper 1, guarantee the stability after assembly, the upper edge joint 11 of outward is provided on the edge portion of the top of hopper 1 along its outside, and the upper edge joint 11 is horizontally outward, and the upper edge joint 11 is provided with upper positioning column 14, and upper positioning column 4 is fixedly installed on the upper edge joint 11, to guarantee the accuracy of top cover 2 and hopper 1 butt joint, the upper positioning column 14 has at least two, which is arranged in circular array with the end surface center of top cover 2 as center, to facilitate the accurate butt joint of top cover 2 with hopper 1 through upper positioning column 14, facilitate assembly, the top cover 2 is provided with upper positioning hole 24 corresponding in number and position with upper positioning column 14, and upper positioning column 14 can be inserted in upper positioning hole 24, and the upper positioning hole 24 and upper positioning column 14 of upper sleeve joint cooperation guarantee the accuracy of top cover 2 when assembling on the top of hopper 1, guarantee the stability after equipment assembly; Figure 1 And 3 As shown in the description, to facilitate the fixed connection between top cover 2 and hopper 1 after assembly, the top cover 2 and hopper 1 are fixedly connected together through automatic clamping mechanism 4. Figure 1 And Figures 5 to 7 As shown in the description, the automatic clamping mechanism 4 includes servo motor 41, and the servo motor 41 is fixedly installed on the top surface of top cover 2 through base 23, and one end of the servo motor 41 has a power output end vertically downward, and correspondingly, the main shaft 42 of the servo motor 4 is vertically downward, the lower end of the main shaft 42 is provided with driving bevel gear 43, the driving bevel gear 43 is located in the base 23, and the outer end of the main shaft 42 penetrates through the link hole of the base 23 and is connected with the driving bevel gear 43 in the base 23, the servo motor 41 can drive the main shaft 42 to rotate, and the driving bevel gear 43 is driven by the main shaft 42 to rotate clockwise or counterclockwise. To facilitate the fixed connection of top cover 2 and hopper 1 assembled together, the top cover 2 is provided with clamping device for clamping the edge of hopper 1 assembly surface, the clamping device can be clamped together with the outer edge of the combined surface of top cover 2 and hopper 1, to ensure the balance of force around when top cover 2 and hopper 1 are clamped, as shown in the description Figure 1 , 6As shown in FIGS. 7, the clamping devices have at least three sets, and the clamping devices are in transmission connection with the servo motor 41, and the three sets of clamping devices are in a circular array with the servo motor 41 as the center on the top of the top cover 2; the clamping device comprises a screw rod 44 movably arranged on the top cover 2, the screw rod 44 is horizontally arranged, and one end of the screw rod 44 close to the center of the top cover 2 is provided with a driven bevel gear 45 fixedly connected therewith, the driven bevel gear 45 is in tooth shape engagement with the driving bevel gear 43, the driving bevel gear 43 can drive the driven bevel gear 45 to rotate, thereby driving the screw rod 44 to rotate synchronously; in order to facilitate the installation of the screw rod 44 on the top cover 2, meanwhile, not affecting the driving of the screw rod 44 to rotate by the driving bevel gear 45 through the driven bevel gear 45, as shown in the accompanying drawings Figures 5 to 8 As shown in FIGS. 7, the clamping devices have at least three sets, and the clamping devices are in transmission connection with the servo motor 41, and the three sets of clamping devices are in a circular array with the servo motor 41 as the center on the top of the top cover 2; the clamping device comprises a screw rod 44 movably arranged on the top cover 2, the screw rod 44 is horizontally arranged, and one end of the screw rod 44 close to the center of the top cover 2 is provided with a driven bevel gear 45 fixedly connected therewith, the driven bevel gear 45 is in tooth shape engagement with the driving bevel gear 43, the driving bevel gear 43 can drive the driven bevel gear 45 to rotate, thereby driving the screw rod 44 to rotate synchronously; in order to facilitate the installation of the screw rod 44 on the top cover 2, meanwhile, not affecting the driving of the screw rod 44 to rotate by the driving bevel gear 45 through the driven bevel gear 45, as shown in the accompanying drawings Figures 5 to 8As shown, the holding device comprises a hanging arm 4411 fixedly connected below the bottom of the lead screw nut 441, one side of the hanging arm 4411 is provided with an upper cantilever 4412 corresponding to the edge of the top cover 2, the upper cantilever 4412 is provided with an upper clamping block 4414 for clamping the top cover 2 and the upper end edge part of the hopper 1, the upper clamping block 4414 is provided with a clamping groove 44141 corresponding to one side of the top cover 2 and the upper end edge part of the hopper 1, the end face of the upper clamping block 4414 with the clamping groove 44141 is in the shape of "┌", which is convenient for clamping the top surface of the edge of the top cover 2 and the outer side of the joint surface of the top cover 2 and the hopper 1 together; the bottom of the hanging arm 4411 is provided with a lower cantilever 4413, the lower cantilever 4413 corresponds to the upper cantilever 4412, and the upper cantilever 4412 and the lower cantilever 4413 are fixedly connected with the hanging arm 4411, the bottom of the lower cantilever 4413 is provided with a gas cylinder 443, the gas cylinder 443 is vertically arranged, the outer end of the piston rod 4431 of the gas cylinder 443 penetrates the lower cantilever 4413 upward and corresponds to the upper and lower clamping grooves 44141, the lower cantilever 4413 is provided with a linking hole for the piston rod 4431 to pass through upward and downward, the linking hole is in clearance fit with the piston rod 4431, and the outer end of the piston rod 4431 is fixedly provided with a lower clamping block 4415. The lower clamping block 4415 corresponds to the upper and lower clamping grooves 44141, and can abut against the bottom surface of the upper turning edge joint 11 of the hopper 1; in order to ensure the stability and linearity of the lead screw nut 441 moving on the lead screw 44, as shown in the accompanying drawings Figure 5 and 8 As shown, the lead screw 44 is provided below with a guide sleeve 445 parallel to it, the guide sleeve 445 is fixedly connected with the bearing seat 46, the two ends of the guide sleeve 445 are communicated, it penetrates the two groups of bearing seats 46 connected with the lead screw 44, and the guide sleeve 445 is fixed on the bearing seat 46, the guide sleeve 445 is provided with a guide rod 444 in sliding fit therewith, one end of the guide rod 444 away from the driven helical gear 45 is fixedly connected with the lower end of the lead screw nut 441, and the guide rod 444 can move synchronously with the lead screw nut 441; in order to prevent the lead screw nut 441 from slipping off the lead screw 44, as shown in the accompanying drawings Figure 5 As shown, one end of the lead screw 44 away from the driven helical gear 45 is provided with a limiting stopper 442, the limiting stopper 442 is in threaded connection with the lead screw 44, the diameter of the limiting stopper 442 is greater than that of the lead screw 44, so that the position of the lead screw nut 441 can be limited to prevent it from slipping off the lead screw 44; as shown in the accompanying drawings Figure 1 and 3 As shown, the spherical head 3 is detachably arranged at the bottom of the hopper 1, as shown in the accompanying drawings Figure 4As shown, the bottom of the hopper 1 is provided with an outwardly turned-down edge joint 12 at the edge portion of its outer side, the top of the spherical head 3 is provided with an outward positioning joint 31 at the edge portion of its outer side, the turned-down edge joint 12 and the positioning joint 31 are the same structure and correspond to each other, the turned-down edge joint 12 can be attached to the positioning joint 31, in order to ensure the accuracy of the assembly of the hopper 1 and the spherical head 3, the positioning joint 31 is provided with a lower positioning column 32, the lower positioning column 32 has at least two, which is arranged in a circular array with the center of the top surface of the spherical head 3 as the center, in order to facilitate the connection of the hopper 1 and the spherical head 3, the turned-down edge joint 12 is provided with a lower positioning hole 13 corresponding to the lower positioning column 32, the lower positioning column 32 can be inserted into the lower positioning hole 13; after the hopper 1 and the spherical head 3 are assembled together, the turned-down edge joint 12 and the positioning joint 31 of the hopper 1 and the spherical head 3 are fixedly connected together through the quick-assembly clamp 5 at the outer side of the connection end, realizing the fixed connection of the hopper 1 and the spherical head 3, because the diameter of the connection end between the spherical head 3 and the hopper 1 is relatively small, so it is convenient to fix through the quick-assembly clamp 5, and it is also convenient to disassemble.

[0033] When assembling, the hopper 1 and the spherical head 3 are installed together, the turned-down edge joint 12 below the hopper 1 corresponds to the positioning joint 31 on the spherical head 3, the lower positioning hole 13 corresponds to the lower positioning column 32, and then they are connected together, realizing the accurate assembly between the hopper 1 and the spherical head 3, finally the turned-down edge joint 12 and the positioning joint 31 combined together are clamped together through the quick-assembly clamp 5, realizing the assembly and fixation of the hopper 1 and the spherical head 3; then the lifting lug 22 on the top cover 2 is connected through the travelling crane or other hoisting tools, the top cover 2 is assembled on the top of the hopper 1, when hoisting, the upper positioning hole 24 on the top cover 2 corresponds to the upper positioning column 14 and is sleeved together, realizing the accurate assembly of the top cover 2 on the hopper 1; then the servo motor 41 is started, the main shaft 42 drives the driving bevel gear 43 to rotate, the driving bevel gear 43 drives the driven bevel gear 45 to rotate, the driven bevel gear 45 drives the lead screw 44 to rotate, when the lead screw 44 rotates, it can drive the lead screw nut 441 on the threaded section to move towards the driven bevel gear 45, the lead screw nut 441 realizes horizontal limiting through the mutually matched guide rod 444 and guide sleeve 445, ensuring its straightness; at the same time, when the lead screw nut 441 moves, the lifting arm 4411 at the bottom of the lead screw nut 441 moves synchronously, the lifting arm 4411 drives the upper suspension arm 4412 and the lower suspension arm 4413 to move synchronously, the upper clamping block 4414 on the upper suspension arm 4412 is clamped on the outer edge portion of the top cover 2 and the outer side of the top cover 2 and the turned-up edge joint 11 through the clamping groove 44141 at the end of the upper clamping block 4414, then the lower clamping block 4415 connected with the piston rod 4431 of the air cylinder 443 is driven to move upward by the air cylinder 443, so that the lower clamping block 4415 and the bottom of the turned-up edge joint 11 abut together, realizing the fixed connection between the top cover 2 and the hopper 1.

[0034] The weightless scale convenient to assemble can realize quick positioning and installation of the top cover 2, the hopper 1 and the spherical head 3 through the positioning column and the positioning hole, has high precision after assembly, is good in stability, guarantees the stability of operation after the equipment is disassembled, can realize quick clamping of the top cover 2 and the hopper 1 through the automatic clamping mechanism, is good in reliability, can adapt to clamping use between top covers 2 and hoppers 1 of different diameters, is strong in universality, the quick clamping 5 is simple and convenient to operate, can improve the assembly efficiency between the top cover 2, the hopper 1 and the spherical head 3, and is convenient for industry popularization.

[0035] It should be emphasized that the above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A loss-in-weight scale that is easy to assemble, comprising a hopper (1), a top cover (2) and a spherical head (3); the top cover (2) is arranged on the top of the hopper (1), a feed port (21) communicating with the inner cavity of the hopper (1) is provided on the top cover (2), and the spherical head (3) is arranged at the bottom of the hopper (1), characterized in that: The top cover (2) and the hopper (1) are fixedly connected together via an automatic clamping mechanism (4); the automatic clamping mechanism (4) comprises a servo motor (41), the servo motor (41) is fixedly mounted on the top surface of the top cover (2) via a base (23), the main shaft (42) of the servo motor (41) is vertically downward, and a driving helical gear (43) is provided at the lower end of the main shaft (42), and the servo motor (41) can drive the driving helical gear (43) to rotate clockwise or counterclockwise via the main shaft (42); a clamping device is provided on the top cover (2), the clamping device comprises a lead screw (44) movably provided on the top cover (2), the lead screw (44) is horizontally provided, and a driven helical gear (45) fixedly connected to the lead screw (44) is provided at one end thereof close to the center of the top cover (2). The driven helical gear (45) is tooth-engaged with the active helical gear (43), and the active helical gear (43) can drive the driven helical gear (45) to rotate, thereby driving the lead screw (44) to rotate synchronously; one end of the lead screw (44) away from the driven helical gear (45) extends outside the top cover (2), and the lead screw (44) is provided with a lead screw nut (441) engaged with its tooth shape, and a clamping device fixedly connected to the lead screw nut (441) is provided below the lead screw nut (441), and the clamping device can move on the lead screw (44) along with the lead screw nut (441), and the edge of the contact surface of the top cover (2) and the hopper (1) is clamped by the clamping device; the hopper (1) and the spherical head (3) are fixedly connected together by a quick-release clamp (5).

2. The easy-to-assemble loss-in-weight scale according to claim 1, characterized in that: The portion of the lead screw (44) from one end connected to the driven helical gear (45) to the middle section thereof is smooth, and an external thread is provided on the other portion of the lead screw (44) opposite to the smooth surface. The lead screw nut (441) is screwed onto the external threaded portion, and at least two bearings fixedly connected thereto are sleeved on the smooth surface, and the bearings are fixedly mounted on the top cover (2) via a bearing seat (46).

3. The easy-to-assemble loss-in-weight scale according to claim 2, characterized in that: A guide sleeve (445) is provided below the lead screw (44) and is parallel to the lead screw (44). The guide sleeve (445) is fixedly connected to the bearing seat (46). A guide rod (444) is provided in the guide sleeve (445) and is slidably matched with the lead screw. One end of the guide rod (444) away from the driven helical gear (45) is fixedly connected to the lower end of the lead screw nut (441). The guide rod (444) can move synchronously with the lead screw nut (441).

4. The easy-to-assemble loss-in-weight scale according to claim 1, characterized in that: The clamping device includes a suspension arm (4411), the suspension arm (4411) is fixedly connected to the bottom of the lead screw nut (441), and an upper cantilever (4412) is provided on the suspension arm (4411) at one side corresponding to the edge of the top cover (2). The upper cantilever (4412) is provided with an upper clamping block (4414) for clamping the upper edge of the top cover (2) and the hopper (1), and a clamping groove (4414) is provided on one side corresponding to the upper edge of the top cover (2) and the hopper (1). 141); A lower cantilever (4413) is provided at the bottom of the boom (4411), and the lower cantilever (4413) corresponds to the upper cantilever (4412) in upper and lower directions. A cylinder (443) is provided at the bottom of the lower cantilever (4413), and the cylinder (443) is vertically arranged. The outer end of the piston rod (4431) thereof passes through the lower cantilever (4413) upward and corresponds to the card slot (44141) in upper and lower directions. A lower card block (4415) is fixedly provided at the outer end of the piston rod (4431).

5. The easy-to-assemble loss-in-weight scale according to claim 1, characterized in that: A limit stopper (442) is provided on one end of the lead screw (44) away from the driven helical gear (45), and the diameter of the limit stopper (442) is larger than the diameter of the lead screw (44).

6. The easy-to-assemble loss-in-weight scale according to claim 1, characterized in that: The clamping devices have at least three groups, which are arranged in a circular array on the top of the top cover (2) with the servo motor (41) as the center.

7. The easy-to-assemble loss-in-weight scale according to claim 1, characterized in that: The top of the hopper (1) is provided with an outwardly facing upper flange joint (11) along its outer edge, and an upper positioning column (14) is provided on the upper flange joint (11). The top cover (2) is provided with upper positioning holes (24) corresponding in number and position to the upper positioning columns (14), and the upper positioning columns (14) can be inserted into the upper positioning holes (24).

8. The easy-to-assemble loss-in-weight scale according to claim 1, characterized in that: The bottom of the hopper (1) is provided with an outward lower flange joint (12) along its outer edge, and the top of the spherical head (3) is provided with an outward positioning joint (31) along its outer edge. The lower flange joint (12) and the positioning joint (31) have the same structure and correspond to each other up and down. The positioning joint (31) is provided with a lower positioning column (32). The lower flange joint (12) is provided with lower positioning holes (13) whose number and position correspond to the lower positioning columns (32) up and down, and the lower positioning columns (32) can be inserted into the lower positioning holes (13).

9. The easy-to-assemble loss-in-weight scale according to claim 1, characterized in that: A lifting lug (22) is provided on the top of the top cover (2).

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