Belleville spring counting device

Abstract

The invention discloses a belleville spring counting device, which is provided with a scale, a weight adjusting mechanism, a belleville spring and a base from top to bottom, and is characterized in that the scale is arranged above the weight adjusting mechanism; a weight adjusting mechanism is arranged on the base, a belleville spring is arranged between the weight adjusting mechanism and the base, a fixing mechanism and a limiting mechanism are further arranged on the weight adjusting mechanism, the free height of the belleville spring is H0, the thickness of the belleville spring is t, and the cone height h0 of the belleville spring is equal to H0-t, h0 / tgt; 2, the outer diameter of the belleville spring is D, and the inner diameter of the belleville spring is d, 3gt; d / dgt; 1.5 parts; through the structural design of the weight adjusting mechanism, the belleville spring, the base, the fixing mechanism and the limiting mechanism, the characteristic of sudden change of the belleville spring is utilized, accurate counting of small objects of the same specification is achieved, and the structure is convenient to observe and quite practical.

Description

Technical Field

[0001] The present invention relates to the field of disc spring counting applications, and particularly to a disc spring counting device. Background Art

[0002] As a basic component in mechanical equipment, springs are used in many fields of modern industry. Especially in the fields of the machinery industry, railway industry, construction industry, nuclear power industry, etc., they provide axial preloading force and play roles such as sealing, energy storage, and shock absorption. The parameters of disc springs generally consist of outer diameter D, inner diameter d, thickness t, and free height H0. The existing method for piece-counting packaging of the same objects with the same specifications (weights) usually first determines the number of items in a single package and weighs it as a reference standard during operation; subsequently, the objects to be packaged are weighed with the same weight for packing; if it is confirmed that some small-sized disc spring workpieces with the same specifications are packed by the number of pieces, such as 1000 pieces per package. Currently, during operation, first select 1000 disc spring workpieces, weigh and record the weight of 1000 disc spring workpieces as the reference standard; subsequently, confirm the packaging with the same weight. Each time when weighing, a certain number of disc springs are added or reduced according to the operator's experience until the weight of this weighing is the same as the reference standard weight previously weighed. This operation method has very high requirements for the experience of the weighing staff and low efficiency; therefore, a device with a simple structure applicable to counting small objects with the same specifications is needed to quickly achieve accurate counting and convenient observation for counting packaging. Summary of the Invention

[0003] In view of this, the technical problem to be solved by the present invention is: to provide a disc spring counting device with a simple structure applicable to counting small objects with the same specifications to quickly achieve accurate counting and convenient observation for counting packaging.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions to implement:

[0005] A disc spring counting device is provided with a weighing pan, a weight adjusting mechanism, a disc spring, and a base from top to bottom. The weighing pan is arranged above the weight adjusting mechanism; a disc spring is installed between the weight adjusting mechanism and the base. The weight adjusting mechanism is also provided with a fixing mechanism and a limiting mechanism. The free height of the disc spring is H0, the thickness of the disc spring is t, the conical height h0 of the disc spring = H0 - t, h0 / t > √2, the outer diameter of the disc spring is D, the inner diameter of the disc spring is d, and 3 > D / d > 1.5. When h0 / t > √2, the disc spring will exhibit negative stiffness after passing through the maximum load of the spring, that is, when the spring deformation amount increases (the compression amount increases), the elastic force will become smaller.

[0006] Preferably, the weight adjustment mechanism is composed of a supporting pad or at least one weight adjustment sheet and a supporting pad. A first accommodating space of the supporting pad is provided upward at the center of the upper end surface of the supporting pad. The base or the supporting pad is equipped with a limiting mechanism for restricting the compression amount of the disc spring, and 3≤h0 / t≤10. As h0 / t gradually increases, the deformation amount in the negative stiffness section gradually increases with the increase of the ratio of h0 / t.

[0007] Preferably, the weight adjustment sheet is annular, the inner diameter of the weight adjustment sheet is greater than or equal to the inner diameter of the first accommodating space of the supporting pad. The weight adjustment sheet has multiple weight models, which are adjustment sheets of multiple models with the same inner and outer diameters but different thicknesses. A boss of the supporting pad is provided downward at the center of the lower end surface of the supporting pad.

[0008] Preferably, the limiting mechanism is a limiting convex ring integrally formed in the circumferential direction at the upper end of the base. The weight adjustment sheet, the supporting pad, and the limiting convex ring are provided with equal-diameter through holes at least bisecting the corresponding positions axially. The base is provided with threaded holes axially corresponding to the above through holes. The fixing mechanism is a fixing bolt. The bolt passes through the through hole from top to bottom and is connected to the base in cooperation with the threaded hole. The outer diameter of the bolt is smaller than the inner diameter of the through hole, and the outer side wall of the bolt does not contact the through hole. The diameter of the bolt head of the fixing bolt is greater than the diameter of the through hole.

[0009] Preferably, the outer diameter of the boss of the supporting pad is smaller than the inner diameter of the disc spring. The boss of the supporting pad sleeves the inner diameter of the disc spring. The outer diameter of the disc spring is smaller than the inner diameter of the limiting convex ring. The disc spring is placed on the base and inside the limiting convex ring. An annular flange of the supporting pad is provided on the outer circumference of the upper end of the supporting pad, and a second accommodating space of the supporting pad with an upward opening is formed. The inner diameter of the weight adjustment sheet is greater than or equal to the inner diameter of the second accommodating space of the supporting pad. The center of the second accommodating space of the supporting pad is downward to be the first accommodating space of the supporting pad. The weighing pan is placed in the second accommodating space of the supporting pad.

[0010] Preferably, the limiting mechanism is a limiting bolt, which is threadedly connected downward from the center of the first accommodating space of the supporting pad. The bottom of the limiting bolt is lower than the lower end surface of the boss of the supporting pad. The weight adjustment sheet and the supporting pad are provided with equal-diameter threaded holes at the corresponding positions axially. The fixing mechanism includes a first fixing bolt and a second fixing bolt. The first fixing bolt connects the weight adjustment sheet and the supporting pad from top to bottom. The lower end surface of the boss of the supporting pad is provided with equal-diameter threaded holes at least bisecting the corresponding positions. The second fixing bolt is connected to the threaded holes on the lower end surface of the boss of the supporting pad.

[0011] Preferably, the outer diameter of the supporting pad boss is smaller than the inner diameter of the disc spring, the supporting pad boss is sleeved on the inner diameter of the disc spring, the outer diameter of the disc spring is smaller than the inner diameter of the limiting convex ring, the disc spring is placed on the base, the weighing pan is placed on the upper end surface of the weight adjusting piece, the diameter of the bolt head of the second fixing bolt is larger than the diameter of the corresponding threaded hole, and the inner diameter edge of the disc spring is arranged between the supporting pad and the bolt head of the second fixing bolt.

[0012] During use, select a suitable disc spring model, and the maximum elastic force Fmax of the disc spring is greater than the total weight of the small workpieces to be packaged. The maximum elastic forces Fmax of different models of disc springs are known. First, add workpieces one by one to the weighing pan. The load of the disc spring includes the total weight of the weighing pan, the weight adjusting piece, the supporting pad and the workpieces added to the weighing pan until the disc spring undergoes a mutation, and then the total number of workpieces added to the weighing pan can be calculated.

[0013] From the above technical solutions, it can be seen that the beneficial effects of the present invention are:

[0014] Compared with the prior art, through the structural design of the weight adjusting mechanism, the disc spring, the base, the fixing mechanism and the limiting mechanism, the present invention realizes the accurate counting of small objects of the same specification, and this structure is convenient to observe and very practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0016] Figure 2 is a schematic top view structural diagram of Embodiment 1 of the present invention;

[0017] Figure 3 is Figure 2 a sectional view taken along line A-A in

[0018] Figure 4 is a schematic structural diagram of Embodiment 1 of the present invention loaded with a load;

[0019] Figure 5 is Figure 4 a sectional view taken along line A-A in

[0020] Figure 6 is a schematic structural diagram of Embodiment 2 of the present invention;

[0021] Figure 7 is a schematic top view structural diagram of Embodiment 2 of the present invention;

[0022] Figure 8 is Figure 7 a sectional view taken along line A-A in

[0023] Figure 9 is a schematic cross-sectional structure diagram of the disc spring of the present invention;

[0024] Figure 10 Schematic diagram of the force value curve of the conical spring in Embodiment 1 of the present invention;

[0025] Figure 11 Schematic diagram of the force value curve of the conical spring in Embodiment 2 of the present invention. Detailed implementation manners

[0026] In order to enable those skilled in the art to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention.

[0027] As Figures 1-10 shown, a conical spring counting device is provided with a weighing pan 10, a weight adjusting mechanism, a conical spring 20, and a base 30 from top to bottom. The weighing pan 10 is provided above the weight adjusting mechanism; the conical spring 20 is installed between the weight adjusting mechanism and the base 30. The weight adjusting mechanism is further provided with a fixing mechanism and a limiting mechanism. The free height of the conical spring is H0, the thickness of the conical spring is t, the conical height h0 of the conical spring = H0 - t, and h0 / t > √2; the outer diameter of the conical spring is D, the inner diameter of the conical spring is d, and 3 > D / d > 1.5. When h0 / t > √2, the conical spring will exhibit negative stiffness after passing through the maximum load of the spring, that is, as the deformation amount of the spring increases, the elastic force of the conical spring will become smaller.

[0028] The weight adjusting mechanism is composed of a supporting pad 50 or at least one weight adjusting piece 40 and a supporting pad 50. A first accommodating space 51 for the supporting pad is provided upward at the center of the upper end surface of the supporting pad 50. The base 30 or the supporting pad 50 is provided with a limiting mechanism for restricting the compression amount of the conical spring 20, and 3 ≤ h0 / t ≤ 10. As h0 / t gradually increases, the deformation amount in the negative stiffness section gradually increases with the increase of the ratio of h0 / t.

[0029] The weight adjusting piece 40 is annular, the inner diameter of the weight adjusting piece 40 is greater than or equal to the inner diameter of the first accommodating space 51 of the supporting pad, and a supporting pad boss 52 is provided downward at the center of the lower end surface of the supporting pad 50.

[0030] Embodiment 1

[0031] As Figures 1-5 , Figure 9 , Figure 10As shown in the figure, the disc spring counting device is provided with a weighing pan 10, a weight adjusting mechanism, a disc spring 20, and a base 30 from top to bottom. The weighing pan 10 is provided above the weight adjusting mechanism; a disc spring 20 is installed between the weight adjusting mechanism and the base 30. The weight adjusting mechanism is also provided with a fixing mechanism and a limiting mechanism. The free height of the disc spring is H0, the thickness of the disc spring is t, the conical height h0 of the disc spring = H0 - t, and 3 ≤ h0 / t ≤ 5; the outer diameter of the disc spring is D, the inner diameter of the disc spring is d, and 3 > D / d > 1.5. After the disc spring passes through the maximum load of the spring, negative stiffness will occur, that is, as the deformation of the disc spring increases, the elastic force of the disc spring will become smaller.

[0032] The weight adjusting mechanism is composed of at least one weight adjusting piece 40 and a support pad 50. A first accommodation space 51 of the support pad is provided upward at the center of the upper end surface of the support pad 50. The base 30 is equipped with a limiting mechanism for limiting the compression amount of the disc spring 20; the weight adjusting piece 40 is annular, the inner diameter of the weight adjusting piece 40 is greater than or equal to the inner diameter of the first accommodation space 51 of the support pad, and a support pad boss 52 is provided downward at the center of the lower end surface of the support pad 50.

[0033] As Figures 1-5 As shown in the figure, the limiting mechanism is a limiting convex ring 60 integrally formed in the circumferential direction at the upper end of the base. Equal-diameter through holes are provided at the axially corresponding positions of the weight adjusting piece 40, the support pad 50, and the limiting convex ring 60. Threaded holes are provided at the axially corresponding positions of the base 30. The fixing mechanism is a fixing bolt 70. The bolt passes through the through hole from top to bottom and is connected to the base 30 by cooperating with the threaded hole. The outer diameter of the bolt is smaller than the inner diameter of the through hole, and the outer side wall of the bolt does not contact the through hole. The diameter of the bolt head of the fixing bolt 70 is greater than the diameter of the through hole.

[0034] The outer diameter of the support pad boss 52 is smaller than the inner diameter of the disc spring 20. The support pad boss 52 is sleeved on the inner diameter of the disc spring 20. The outer diameter of the disc spring 20 is smaller than the inner diameter of the limiting convex ring 60. The disc spring 20 is placed on the base 30 and within the limiting convex ring 60. An annular flange 53 of the support pad is provided on the outer circumference of the upper end of the support pad 50, and a second accommodation space 54 of the support pad with an upward opening is formed. The inner diameter of the weight adjusting piece 40 is greater than or equal to the inner diameter of the second accommodation space 54 of the support pad. The first accommodation space 51 of the support pad is downward at the center of the second accommodation space 54 of the support pad. The weighing pan 10 is placed in the second accommodation space 54 of the support pad.

[0035] The weight adjusting piece 40 is provided with multiple weight models as needed, that is, adjusting pieces of different weights with the same inner and outer diameters but different thicknesses. Multiple models of disc springs 20 are set according to the actual situation, so that the maximum elastic force of the disc spring is greater than the single-pack weight of the workpiece to be packaged.

[0036] As Figures 1-5 , Figure 9 、 Figure 10 shown, a counting method for small workpieces of the same specification. Among them, point B on the force value curve is the maximum elastic force of the spring, Fmax, and the corresponding compression of the conical disc spring is the OI section; the elastic force of the conical disc spring corresponding to point G on the force value curve is F3, corresponding to the compression of the conical disc spring being the OF section. At this time, the bottom end of the support pad 50 contacts the limit convex ring 60 at the upper end of the base; the position of point A on the force value curve is the force value F1 of the conical disc spring after deducting the weight of the workpieces to be packaged from Fmax, and the compression of the conical disc spring is the OD section; point C on the force value curve is the point where the elastic force of the negative stiffness section with the same force value as that of the conical disc spring at point A is F1; point H on the force value curve is any point between O and B; preferably, it is at a position close to point B between A and B. The elastic force of the conical disc spring corresponding to point H on the force value curve is F2, and the corresponding compression of the conical disc spring is the OE section; point O is the position where the conical disc spring is not compressed; point N is the position where the conical disc spring is flattened, and ON is the compression when the conical disc spring is flattened.

[0037] According to the following steps:

[0038] S1: Select a suitable type of conical disc spring. The maximum elastic force Fmax of the conical disc spring is greater than the number of small workpieces to be packaged, which is a, with a weight of W1, and the weight of a single small workpiece is Ws; that is, W1 = aWs, F1 = Fmax - W1, and F1 < F3 is satisfied; the maximum elastic forces Fmax of different types of conical disc springs are known, or they can be calculated according to the national standard for calculating conical disc springs, GB / T1972.1 - 2023.

[0039] S2: Add workpieces one by one to the weighing pan 10 for the first time. The weight of the weighing pan 10 is W2, and the weight adjustment mechanism consists of a weight adjustment piece 40 with a weight of W3 and a support pad 50 with a weight of W4. Until the conical disc spring 20 undergoes a mutation, at this time, the weighing pan 10 and the support pad will instantaneously drop to point G. At this time, the load provided by the conical disc spring is F3, and stop adding small workpieces. At this time, the number of small workpieces in the weighing pan 10 is b. Take out a workpieces to be packaged, and the spring returns to the compression of the OD position. The remaining workpieces are b - a. If the number of b - a is small, then the remaining workpieces are used as weight adjustment pieces and all are placed in the first accommodation space 51 of the support pad. The weight of the workpieces placed in the first accommodation space 51 of the support pad is W5. At this time, the following relationship is satisfied,

[0040] W1 + W2 + W3 + W4 + W5 - Ws ≤ Fmax < W1 + W2 + W3 + W4 + W5;

[0041] When the number of remaining workpieces b - a is large and the weight is heavy, add one or more weight adjustment pieces 40 of appropriate models to offset the weight of a part of the b - a remaining workpieces. The weight of the newly added weight adjustment pieces is Wz, and the number of workpieces corresponding to Wz is c pieces;

[0042] When the weight of Wz is equal to the sum of the weights of c workpieces, that is, the weight of the added weight adjustment piece is an integer multiple of the weight of the small workpieces to be packaged. After removing c workpieces, the final b - a - c workpieces are placed in the first accommodating space 51 of the pad. The weight of the workpieces placed in the first accommodating space 51 of the pad is W5; at this time, the following relationship is satisfied,

[0043] W1 + W2 + W3 + W4 + W5 + Wz - Ws ≤ Fmax < W1 + W2 + W3 + W4 + W5 + Wz;

[0044] When the weight of Wz is greater than the sum of the weights of c workpieces and less than the sum of the weights of c + 1 workpieces, during adjustment, remove c + 1 workpieces from the weighing pan 10. After adding a weight adjustment piece with a weight of Wz above the pad 50, add a workpieces back to the weighing pan 10 and observe whether the disc spring 20 undergoes a mutation. If a mutation occurs, place the remaining b - a - c - 1 workpieces in the first accommodating space 51 of the pad; then the following relationship is satisfied,

[0045] W1 + W2 + W3 + W4 + W5 + Wz - 2Ws ≤ Fmax < W1 + W2 + W3 + W4 + W5 + Wz - Ws;

[0046] If no mutation occurs, add one more workpiece to the weighing pan 10, and the disc spring will undergo a mutation; at this time, place the remaining b - a - c workpieces in the first accommodating space 51 of the pad; the weight of the workpieces in the first accommodating space 51 of the pad is W5, and the following relationship is satisfied,

[0047] W1 + W2 + W3 + W4 + W5 + Wz - Ws ≤ Fmax < W1 + W2 + W3 + W4 + W5 + Wz;

[0048] S3: Put the remaining workpieces into the first accommodating space 51 of the pad. Or when part of the newly added weight adjustment piece with a weight of Wz is used instead, and when the weight of Wz is equal to the sum of the weights of c workpieces, after removing the c workpieces, the final b - a - c workpieces are put into the first accommodating space 51 of the pad, and a weight adjustment piece with a weight of Wz is added above the pad; when the weight of Wz is greater than the sum of the weights of c workpieces and less than the weight of c + 1 workpieces, during adjustment, remove the weight of c + 1 workpieces, add a weight adjustment piece with a weight of Wz above the pad, add a workpieces back into the weighing pan 10, and observe whether the disc spring 20 undergoes a mutation. If a mutation occurs, after removing the a workpieces, the remaining workpieces, that is, b - a - c - 1 workpieces, are put into the first accommodating space 51 of the pad; when the weight of Wz is greater than the sum of the weights of c workpieces and less than the weight of c + 1 workpieces, during adjustment, remove the c + 1 workpieces, add a weight adjustment piece with a weight of Wz, add a workpieces back into the weighing pan 10. If no mutation occurs, add one more workpiece to the weighing pan 10, and the disc spring will undergo a mutation; at this time, after removing the a workpieces, put the remaining workpieces, that is, b - a - c workpieces, into the first accommodating space 51 of the pad; for each subsequent packaging, add workpieces to the weighing pan 10 one by one until the disc spring 20 undergoes a mutation, and the number of workpieces in the weighing pan 10 is the number of workpieces to be packaged, with accurate counting.

[0049] In step S2, the disc spring 20 can be compressed to point E, the position of point H on the force - value curve, that is, compress the disc spring by the OE section, by the fixing bolt 70; after adding the fixing bolt 70, before the weight of the workpieces to be counted in the weighing pan reaches F2, the whole mechanism will remain stationary; when it exceeds F2 and before it reaches Fmax, the weighing pan and the pad will slightly descend; when it exceeds Fmax, the whole mechanism will undergo a mutation, and the weighing pan 10 and the pad 50 will instantaneously descend to point G. At this time, the load provided by the disc spring is F3. After taking out the workpieces to be counted in the weighing pan 10, the force - value curve of the disc spring returns to point H along GBH, that is, the compression amount of the disc spring is the OE section.

[0050] The preferred position of the H point should be set after point A and before point B, close to point B. This can ensure that when counting items are added to the weighing pan, the characteristics of the disc spring will pass through the maximum point B (Fmax); it is convenient for visual observation; this disc spring counting device can also be used in automatic control. At this time, there is no need to judge with the eyes. Existing mature technologies such as sensors or contact to connect the circuit are used in combination with the disc spring counting device. When it is determined whether the supporting pad contacts the limiting step, the H point can also be selected at any position before point B. When H coincides with point O, the fixing bolt 70 will not limit the initial compression amount of the disc spring. The present invention can also be used for the weight measurement of fluids. In cooperation with external sensors and controllers, such as PLC controllers, the weight measurement of fluids is realized through the mutation of the disc spring; it is used for the packaging of fluids with equal weights, etc. The principle is similar to the above and will not be elaborated further.

[0051] In this embodiment, when the weighing pan and the counting workpieces to be packaged in the weighing pan are removed, after the supporting pad rapidly rises under the restoring force of the disc spring, the fixing bolt 70 can prevent the supporting pad 50 and the weight adjusting piece 40 from popping out and causing displacement of the weight adjusting piece 40 or the supporting pad 50.

[0052] The function of the limiting convex ring 60 is to limit the disc spring after mutation. The load F3 when the disc spring is limited needs to be greater than F1. If the load F3 when the disc spring is limited is less than F1, that is, point G is behind point C, the supporting pad cannot return to point H.

[0053] In the initial state, the weight adjusting mechanism is the supporting pad 50, and the principle is the same as above and will not be elaborated further.

[0054] Embodiment 2

[0055] As Figures 6-10 shown, the disc spring counting device is provided with a weighing pan 10, a weight adjusting mechanism, a disc spring 20, and a base 30 from top to bottom. The weighing pan 10 is provided above the weight adjusting mechanism; a disc spring 20 is installed between the weight adjusting mechanism and the base 30. The weight adjusting mechanism is also provided with a fixing mechanism and a limiting mechanism. The free height of the disc spring is H0, the thickness of the disc spring is t, the conical height h0 of the disc spring = H0 - t, 3 ≤ h0 / t ≤ 5, the outer diameter of the disc spring is D, and the inner diameter of the disc spring is d, 3 > D / d > 1.5. After the disc spring passes through the maximum load of the spring, negative stiffness will occur, that is, as the deformation amount of the spring increases, the elastic force of the disc spring will become smaller.

[0056] The weight adjustment mechanism consists of at least one weight adjustment piece 40 and a support pad 50. A first accommodation space 51 for the support pad is provided upward at the center of the upper end surface of the support pad 50. The support pad 50 is equipped with a limit mechanism for restricting the compression amount of the disc spring 20. The weight adjustment piece 40 is annular, the inner diameter of the weight adjustment piece 40 is greater than or equal to the inner diameter of the first accommodation space 51 of the support pad, and a support pad boss 52 is provided downward at the center of the lower end surface of the support pad 50.

[0057] As Figures 6-8 shown, the limit mechanism is a limit bolt 80. The limit bolt 80 is threadedly connected downward from the center of the first accommodation space 51 of the support pad. The bottom of the limit bolt 80 is lower than the lower end surface of the support pad boss 52. Equal-diameter threaded holes are provided at the axially corresponding positions of the weight adjustment piece 40 and the support pad 50. The fixing mechanism includes a first fixing bolt 71 and a second fixing bolt 72. The first fixing bolt 71 connects the weight adjustment piece 40 and the support pad 50 from top to bottom. Equal-diameter threaded holes are provided at the bisected corresponding positions of the lower end surface of the support pad boss 52. The second fixing bolt 72 is connected to the threaded hole on the lower end surface of the support pad boss 52.

[0058] The outer diameter of the support pad boss 52 is smaller than the inner diameter of the disc spring 20. The support pad boss 52 is sleeved on the inner diameter of the disc spring 20. The outer diameter of the disc spring 20 is smaller than the inner diameter of the limit collar 60. The disc spring 20 is placed on the base 30. The weighing pan 10 is placed on the upper end surface of the weight adjustment piece 40. The diameter of the bolt head of the second fixing bolt 72 is greater than the diameter of the corresponding threaded hole. The inner diameter edge of the disc spring 20 is arranged between the support pad 50 and the bolt head of the second fixing bolt 72.

[0059] As Figures 6-9 、 Figure 11 shown, a counting method for counting small workpieces of the same specification. Among them, point B on the force value curve is the maximum elastic force of the spring Fmax, and the corresponding compression amount of the disc spring is the OI section; the elastic force of the disc spring corresponding to point G on the force value curve is F3, corresponding to the compression amount of the disc spring being the OF section. At this time, the bottom end of the limit bolt 80 contacts the upper end surface of the base; point A on the force value curve is the disc spring force value F1 after deducting the weight of the workpieces to be packaged from Fmax, and the compression amount of the disc spring is the OD section; point C on the force value curve is the point with the same elastic force F1 in the negative stiffness section as point A; point O is the position where the disc spring is not compressed; point N is the position where the disc spring is flattened, and ON is the compression amount when the disc spring is flattened;

[0060] According to the following steps:

[0061] S1: Select a suitable type of conical spring. The maximum elastic force Fmax of the conical spring is greater than the number of small workpieces to be packaged, which is a, with a weight of W1, and the weight of a single small workpiece is Ws; that is, W1 = aWs, F1 = Fmax - W1, and F1 < F3 is satisfied. The maximum elastic forces Fmax of different types of conical springs are known and can also be calculated according to the national standard for calculating conical springs in GB / T1972.1 - 2023.

[0062] S2: Add workpieces one by one to the weighing pan 10 for the first time. The weight of the weighing pan 10 is W2, and the weight adjustment mechanism consists of a weight adjustment plate 40 with a weight of W3 and a support pad 50 with a weight of W4. Stop adding small workpieces until the conical spring 20 undergoes a mutation. At this time, the weighing pan 10 and the support pad will instantaneously drop to point G. At this time, the load provided by the conical spring is F3. The number of small workpieces in the weighing pan 10 at this time is b. Take out the a workpieces that need to be packaged, and the spring returns to the compression amount of OD. The remaining workpieces are b - a. If the number of b - a is small, then all the remaining workpieces are used as weight adjustment parts and placed in the first accommodation space 51 of the support pad. The weight of the workpieces placed in the first accommodation space 51 of the support pad is W5. At this time, the following relationship is satisfied,

[0063] W1 + W2 + W3 + W4 + W5 - Ws ≤ Fmax < W1 + W2 + W3 + W4 + W5;

[0064] When the number of remaining workpieces b - a is large and the weight is large, add one or more weight adjustment plates 40 of appropriate types to offset the weight of a part of the b - a remaining workpieces. The weight of the newly added part of the weight adjustment plate is Wz, and the number of workpieces corresponding to Wz is c.

[0065] When the weight of Wz is equal to the weight of c workpieces, that is, the weight of the added weight adjustment plate is an integer multiple of the weight of the small workpieces to be packaged. After removing the c workpieces, the final b - a - c workpieces are placed in the first accommodation space 51 of the support pad. The weight of the workpieces placed in the first accommodation space 51 of the support pad is W5. At this time, the following relationship is satisfied,

[0066] W1 + W2 + W3 + W4 + W5 + Wz - Ws ≤ Fmax < W1 + W2 + W3 + W4 + W5 + Wz;

[0067] When the weight of Wz is greater than the weight of c workpieces and less than the weight of c + 1 workpieces, remove c + 1 workpieces from the weighing pan 10 during adjustment. After adding a weight adjustment plate with a weight of Wz above the support pad 50, add a workpieces to the weighing pan 10 again and observe whether the conical spring 20 undergoes a mutation. If a mutation occurs, place the remaining b - a - c - 1 workpieces in the first accommodation space 51 of the support pad. Then the following relationship is satisfied,

[0068] W1 + W2 + W3 + W4 + W5 + Wz - 2Ws ≤ Fmax < W1 + W2 + W3 + W4 + W5 + Wz - Ws;

[0069] If no mutation occurs, add another workpiece to the weighing pan 10, and then the disc spring will mutate; at this time, put the remaining b - a - c workpieces into the first accommodating space 51 of the support pad; the weight of the workpieces in the first accommodating space 51 of the support pad is W5, satisfying the following relationship,

[0070] W1 + W2 + W3 + W4 + W5 + Wz - Ws ≤ Fmax < W1 + W2 + W3 + W4 + W5 + Wz;

[0071] S3: After putting the remaining workpieces into the first accommodating space 51 of the support pad, or partially replacing them with the newly added weight adjusting piece with a weight of Wz, when the sum of the weight of Wz and the weight of c workpieces is equal, after removing c workpieces, the final b - a - c workpieces are put into the first accommodating space 51 of the support pad, and a weight adjusting piece with a weight of Wz is added above the support pad; when the weight of Wz is greater than the sum of the weight of c workpieces and less than the weight of c + 1 workpieces, when adjusting, remove the weight of c + 1 workpieces, add a weight adjusting piece with a weight of Wz above the support pad, add a workpieces to the weighing pan 10 again, and observe whether the disc spring 20 mutates. If it mutates, after taking away a workpieces, the remaining workpieces, that is, b - a - c - 1, are put into the first accommodating space 51 of the support pad; when the weight of Wz is greater than the sum of the weight of c workpieces and less than the weight of c + 1 workpieces, when adjusting, remove c + 1 workpieces, add a weight adjusting piece with a weight of Wz, add a workpieces to the weighing pan 10 again. If no mutation occurs, add another workpiece to the weighing pan 10, and then the disc spring will mutate; at this time, after taking away a workpieces, put the remaining workpieces, that is, b - a - c, into the first accommodating space 51 of the support pad; for each subsequent packaging, add workpieces to the weighing pan 10 one by one until the disc spring 20 mutates, and the number of workpieces in the weighing pan 10 is the number of workpieces to be packaged, with accurate counting.

[0072] In this embodiment, after taking away the weighing pan 10 and the counting workpieces to be packaged in the weighing pan, after the support pad 50 quickly rises under the restoring force of the disc spring 20, the first fixing bolt 71 connects and fixes the weight adjusting piece 40 and the support pad 50; the second fixing bolt 72 is connected to the threaded hole at the lower end face of the support pad boss 52, the diameter of the bolt head of the second fixing bolt 72 is greater than the diameter of the corresponding threaded hole, the inner diameter edge of the disc spring 20 is arranged between the support pad 50 and the bolt head of the second fixing bolt 72, and the first fixing bolt 71 and the second fixing bolt 72 limit the support pad 50 and the weight adjusting piece 40 from popping out and causing the weight adjusting piece 40 or the support pad 50 to shift.

[0073] The function of the limit bolt 80 is to limit that the load F3 during the limit of the disc spring 20 after mutation occurs to the disc spring 20 needs to be greater than F1. If the load F3 during the limit of the disc spring is less than F1, that is, point G is behind point C, the support pad 50 cannot return to point A.

[0074] In the initial state, the weight adjustment mechanism is the support pad 50, without the weight adjustment piece 40. The principle is the same as above and will not be elaborated here.

[0075] However, the above are only the preferred feasible embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Therefore, all equivalent structural changes made by using the content of the specification and drawings of the present invention are equally included in the scope of the present invention.

Claims

1. A conical spring counting device, characterized in that: From top to bottom, there are a weighing pan (10), a weight adjusting mechanism, a disc spring (20), and a base (30). The weighing pan (10) is provided above the weight adjusting mechanism; a disc spring (20) is installed between the weight adjusting mechanism and the base (30). The weight adjusting mechanism is also provided with a fixing mechanism and a limiting mechanism. The free height of the disc spring is H0, the thickness of the disc spring is t, the conical height h0 of the disc spring = H0 - t, h0 / t > √2, the outer diameter of the disc spring is D, the inner diameter of the disc spring is d, and 3 > D / d > 1.

5.

2. The disc spring counting device according to claim 1, wherein: The weight adjusting mechanism is composed of a spacer (50) or at least one weight adjusting piece (40) and a spacer (50). A first spacer accommodating space (51) is provided upward at the center of the upper end face of the spacer (50). A limiting mechanism for restricting the compression amount of the disc spring (20) is installed on the base (30) or the spacer (50), and 3 ≤ h0 / t ≤ 10.

3. A conical spring counting device according to claim 2, characterized in that: The weight adjusting piece (40) is annular. The inner diameter of the weight adjusting piece (40) is greater than or equal to the inner diameter of the first spacer accommodating space (51). The weight adjusting piece (40) has multiple weight models, which are adjusting pieces of multiple models with the same inner and outer diameters but different thicknesses. A spacer boss (52) is provided downward at the center of the lower end face of the spacer (50).

4. A disc spring counting device according to claim 3, characterized in that: The limiting mechanism is a limiting convex ring (60) integrally formed in the circumferential direction at the upper end of the base. Equal-diameter through holes are provided at least in two equal parts in the axial direction of the weight adjusting piece (40), the spacer (50), and the limiting convex ring (60) at corresponding positions. Threaded holes are provided at the axial positions corresponding to the through holes on the base (30). The fixing mechanism is a fixing bolt (70). The bolt passes through the through hole from top to bottom and is connected to the base (30) by matching with the threaded hole. The outer diameter of the bolt is smaller than the inner diameter of the through hole, and the outer side wall of the bolt does not contact the through hole. The diameter of the bolt head of the fixing bolt (70) is greater than the diameter of the through hole.

5. A conical spring counting device according to claim 4, characterized in that: The outer diameter of the spacer boss (52) is smaller than the inner diameter of the disc spring (20). The spacer boss (52) is sleeved on the inner diameter of the disc spring (20). The outer diameter of the disc spring (20) is smaller than the inner diameter of the limiting convex ring (60). The disc spring (20) is placed on the base (30) and inside the limiting convex ring (60). An annular flange (53) is provided on the outer circumference of the upper end of the spacer (50), and a second spacer accommodating space (54) with an upward opening is formed. The inner diameter of the weight adjusting piece (40) is greater than or equal to the inner diameter of the second spacer accommodating space (54). The first spacer accommodating space (51) extends downward at the center of the second spacer accommodating space (54). The weighing pan (10) is placed inside the second spacer accommodating space (54).

6. A conical spring counting device according to claim 3, characterized in that: The limiting mechanism is a limiting bolt (80), the limiting bolt (80) is threadedly connected downward from the center of the first accommodating space (51) of the support pad, the bottom of the limiting bolt (80) is lower than the lower end surface of the support pad boss (52), the weight adjusting piece (40) and the support pad (50) are provided with equal-diameter threaded holes at axially corresponding positions, the fixing mechanism includes a first fixing bolt (71) and a second fixing bolt (72), the first fixing bolt (71) connects the weight adjusting piece (40) and the support pad (50) from top to bottom, the lower end surface of the support pad boss (52) is provided with equal-diameter threaded holes at least bisecting the corresponding positions, and the second fixing bolt (72) is connected to the threaded hole on the lower end surface of the support pad boss (52).

7. A conical spring counting device according to claim 6, characterized in that: The outer diameter of the support pad boss (52) is smaller than the inner diameter of the disc spring (20), the support pad boss (52) is sleeved on the inner diameter of the disc spring (20), the outer diameter of the disc spring (20) is smaller than the inner diameter of the limiting collar (60), the disc spring (20) is placed on the base (30), the weighing pan (10) is placed on the upper end surface of the weight adjusting piece (40), the diameter of the bolt head of the second fixing bolt (72) is larger than the diameter of the corresponding threaded hole, and the inner diameter edge of the disc spring (20) is arranged between the support pad (50) and the bolt head of the second fixing bolt (72).

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