A quantitative powder shaking device of a powder shaking machine and a powder shaking method thereof

Abstract

The present invention provides a quantitative powder shaking device of a powder shaking machine and a powder shaking method thereof, wherein the device includes: a powder storage box, a feed roller support seat, a reducer, a buffer plate, a feed roller, a feed plate, a thermal transfer film, a thermal transfer film adjustment roller, a shaking plate, a waste powder box, an adjusting cylinder and a shaking motor; the feed roller support seat and the reducer are respectively connected to the feed roller, and the powder in the powder storage box is sequentially scattered on the thermal transfer film after passing through the feed roller, the feed plate and the buffer plate; the adjusting cylinder, the waste powder box and the thermal transfer film adjustment roller are sequentially connected, and the shaking plate and the shaking motor are connected. The present invention can adjust the amount of powder to be sprinkled, realize adaptive control of different patterns, and can adjust the angle of the thermal transfer film to realize different powder shaking effects; in addition, the present invention can also automatically predict when the amount of powder in the powder storage box is insufficient, ensure the continuity of production, and improve production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of powder shaking machines for thermal transfer, and in particular to a quantitative powder shaking device of the powder shaking machine and a powder shaking method thereof. Background Art

[0002] Thermal transfer is a common printing process at present. It has a rich variety of substrates and is suitable for producing small quantities of diverse personalized and customized products, as well as printing patterns containing full-color images or photos. The pattern carrier required for thermal transfer is the thermal transfer film. In order to protect the stability of the ink pattern on the film, a layer of hot-melt adhesive film needs to be added to the pattern as a protective film. The function of the powder shaking machine is to sprinkle hot-melt adhesive powder on the pattern, dry and shape the protected pattern, and ensure the clarity and completeness of the pattern during thermal transfer.

[0003] When the existing powder shaking machine is working, there will always be more or less hot melt adhesive powder on the thermal transfer film. When the amount of ink is large, the hot melt adhesive powder is too little, resulting in some patterns not being well covered. When the amount of ink is small, there is too much powder, which easily causes the pattern quality after thermal transfer to be poor. All of the above will cause the thermal transfer pattern to appear blurred, affecting the stability of production. The technical difficulty lies in that when printing different patterns, the required amount of powder must be variable. How to debug and control the amount of powder for different patterns requires ensuring that the amount of powder sprinkled each time is controllable, and then controlling the speed of the powder sprinkling device in real time based on the powder demand of the printed pattern known in advance, so as to realize the real-time demand of the powder shaking machine for the amount of powder for different patterns.

[0004] At present, the powder shaking machines on the market have the following shortcomings and problems:

[0005] 1. The amount of powder cannot be adjusted. The range of thermal transfer patterns applicable to a single powder shaking machine is narrow, and the amount of powder in different positions of the same pattern cannot be controlled;

[0006] 2. The thermal transfer film and powder have different adaptability at different angles. The angle of the thermal transfer film cannot be adjusted, which affects the printing effect.

[0007] 3. When the powder level in the powder storage box is low, it cannot automatically predict, which may cause the powder in the powder storage box to run out without being aware of it, affecting production efficiency. Summary of the invention

[0008] The present invention preferably provides a solution to the technical problems that the amount of powder sprinkled and the angle of the heat transfer film cannot be adjusted in the existing powder shaking machine.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a quantitative powder shaking device for a powder shaking machine, comprising:

[0011] Powder storage box 1, feed roller support seat 2, reducer 3, buffer plate 4, feed roller 5, feed plate 6, thermal transfer film 7, thermal transfer film adjustment roller 8, shaking plate 9, waste powder box 10, adjustment cylinder 11 and shaking motor 12; feed roller support seat 2 and reducer 3 are respectively connected with feed roller 5, feed roller 5 is located below powder storage box 1, the outer surface of feed roller 5 is provided with quantitative groove, the bottom of feed plate 6 is provided with gap, and the powder in powder storage box 1 is sequentially The powder is scattered on the thermal transfer film 7 after passing through the unloading roller 5, the unloading plate 6 and the buffer plate 4; the adjusting cylinder 11, the waste powder box 10 and the thermal transfer film adjusting roller 8 are connected in sequence, and the adjusting cylinder 11 is used to adjust the vertical height of the waste powder box 10 and the thermal transfer film adjusting roller 8 and then adjust the horizontal angle of the thermal transfer film 7; the shaking plate 9 and the shaking motor 12 are connected, and the shaking plate 9 and the shaking motor 12 are used to shake the residual powder on the thermal transfer film 7 into the waste powder box 10.

[0012] Preferably, the horizontal angle range of the thermal transfer film 7 is between 45° and 75°.

[0013] In a second aspect, the present invention provides a quantitative powder shaking method of a powder shaking machine, using the quantitative powder shaking device of the powder shaking machine described in the first aspect, comprising:

[0014] S10, calculating the required amount of powder to be sprinkled under the unit area pattern, establishing a corresponding relationship between the amount of powder sprinkled by the unloading roller 5 and the powder sprinkle time according to the calculation result, calculating the rotation speed of the reducer 3 in different time periods according to the corresponding relationship, and then adjusting the amount of powder sprinkled by the unloading roller 5 in the corresponding time period;

[0015] S20, dividing the pattern according to the area ratio of the pattern to be printed to the entire image, and adjusting the horizontal angle of the thermal transfer film 7 according to the division result;

[0016] S30, obtaining the remaining powder amount in the powder storage box 1 by calculation, and triggering an automatic warning when the remaining powder amount in the powder storage box 1 is lower than the set threshold value according to the set threshold value.

[0017] Preferably, in S10, the step of calculating the amount of powder required for the pattern per unit area specifically includes:

[0018] The unloading roller 5 is driven at the maximum speed by the reducer 3, so that the powder in the quantitative groove of the unloading roller 5 is scattered on the thermal transfer film 7 after passing through the buffer plate 4; at the same time, the area of ​​the test pattern on the thermal transfer film 7 and the travel of the test pattern along with the transfer film 7 are recorded;

[0019] The powder spreading time of the feed roller 5 at the end of the test pattern stroke is recorded, the residual powder on the buffer plate 4 and the thermal transfer film 7 is collected into the waste powder box 10, and the weight gain of the waste powder box 10 is recorded; the average powder spreading speed of the feed roller 5 is calculated according to the maximum speed and reduction ratio of the reducer 3;

[0020] The amount of powder attached to the test pattern is calculated, and the amount of powder required to be spread per unit area of ​​the pattern is calculated based on the amount of powder attached to the test pattern and the area of ​​the test pattern.

[0021] Preferably, in S10, the establishing of the corresponding relationship between the powder spreading amount and the powder spreading time of the unloading roller 5 specifically includes:

[0022] The starting point of the pattern to be printed is taken as the time zero;

[0023] Using the corresponding moving distance of the pattern to be printed in each interval time period starting from time zero, calculate the area of ​​the pattern to be printed under the width of the moving distance and the amount of powder required for the area, and construct the powder amount and powder time sequence of the feeding roller 5 according to the completion time corresponding to the required amount of powder.

[0024] Preferably, in S20, the pattern is divided according to the area ratio of the pattern to be printed to the entire image, specifically including:

[0025] When the area ratio exceeds 70%, the pattern is classified as a large ink volume pattern;

[0026] When the area ratio is between 70% and 40%, it corresponds to a medium ink volume pattern;

[0027] When the area ratio is less than 40%, it corresponds to a small ink volume pattern.

[0028] Preferably, in S20, according to the result of the division, the horizontal angle of the thermal transfer film 7 is adjusted, specifically including:

[0029] When the pattern is a large ink volume pattern, the horizontal angle of the thermal transfer film 7 is adjusted to 45°;

[0030] When the pattern is a medium ink volume pattern, the horizontal angle of the thermal transfer film 7 is adjusted to 60°;

[0031] When the pattern is a small ink amount pattern, the horizontal angle of the thermal transfer film 7 is adjusted to 75°.

[0032] Preferably, in S20, it further includes: after the horizontal angle adjustment of the thermal transfer film 7 is completed, compensating for the powder spreading amount of the unloading roller 5 of the thermal transfer film 7 at the corresponding horizontal angle.

[0033] Preferably, the method of compensating the powder spreading amount of the thermal transfer film 7 at the corresponding horizontal angle by the feeding roller 5 specifically includes:

[0034] Add an initial amount of powder to the bottom of the thermal transfer film 7, and after printing for a certain period of time, obtain the amount of powder scattered by the feed roller 5 and the amount of powder collected by the waste powder box 10;

[0035] The loss coefficient is calculated using the powder spreading amount of the feed roller 5 and the powder collection amount of the waste powder box 10, and the calculated rotation speed of the reducer 3 is compensated by the loss coefficient to compensate for the powder spreading amount of the feed roller 5 of the thermal transfer film 7 at the corresponding horizontal angle.

[0036] Preferably, in S30, the remaining amount of powder in the powder storage box 1 is obtained by calculation, and according to a set threshold, when the remaining amount of powder in the powder storage box 1 is lower than the set threshold, an automatic warning is triggered, which specifically includes:

[0037] Add a fixed amount of powder into the powder storage box 1, and enter the fixed amount of powder into the system;

[0038] The speed of the reducer 3 is calculated to set the reducer 3, and after printing for a certain period of time, the amount of powder sprinkled by the feed roller 5 and the amount of powder remaining in the powder storage box 1 are calculated;

[0039] The remaining powder amount in the powder storage box 1 is compared with the set threshold value.

[0040] In view of the deficiencies in the prior art, the beneficial effects that can be achieved by the present invention are as follows:

[0041] The present invention can adjust the powder spreading amount through the set reducer and unloading roller to achieve adaptive control of different patterns, and can adjust the angle of the thermal transfer film through the set adjustment cylinder and thermal transfer film adjustment roller to achieve different powder shaking effects.

[0042] Furthermore, the present invention can also automatically predict when the powder amount in the powder storage box is insufficient, thereby ensuring the continuity of production and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is an exploded view of a quantitative powder shaking device of a powder shaking machine provided in Example 1;

[0045] Figure 2 is an axial diagram of a quantitative powder shaking device of a powder shaking machine provided in Example 1;

[0046] Figure 3 It is a side view of a quantitative powder shaking device of a powder shaking machine provided in Example 1;

[0047] Figure 4 yes Figure 1-Figure 3Schematic diagram of the horizontal angle of the thermal transfer film;

[0048] Figure 5 yes Figure 1-Figure 3 Schematic diagram of powder tracks on the thermal transfer film;

[0049] Figure 6 This is a flow chart of a quantitative powder shaking method of a powder shaking machine provided in Example 2.

[0050] In the accompanying drawings, the same reference numerals are used to denote the same components or structures, wherein:

[0051] 1-powder storage box; 2-feeding roller support seat; 3-motor reducer; 4-buffer plate; 5-feeding roller; 6-feeding plate; 7-thermal transfer film; 8-thermal transfer film adjustment roller; 9-shaking plate assembly; 10-waste powder box; 11-adjusting cylinder; 12-shaking motor. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0053] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0054] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0055] Embodiment 1:

[0056] This embodiment 1 provides a quantitative powder shaking device for a powder shaking machine, such as Figure 1-Figure 3As shown, it includes: a powder storage box 1, a feed roller support seat 2, a reducer 3, a buffer plate 4, a feed roller 5, a feed plate 6, a thermal transfer film 7, a thermal transfer film adjustment roller 8, a shaking plate 9, a waste powder box 10, an adjustment cylinder 11 and a shaking motor 12; the feed roller support seat 2 and the reducer 3 are respectively connected to the feed roller 5, the feed roller support seat 2 and the reducer 3 are installed on the two ends of the feed roller 5, the feed roller support seat 2 is used to provide support for the feed roller 5, the reducer 3 is used to adjust the powder spreading amount of the feed roller 5, the feed roller 5 is located below the powder storage box 1, and the powder storage box 1 is bucket-shaped. The powder storage box 1 is used to store powder, and an opening is provided at the bottom thereof. A quantitative groove is provided on the outer surface of the feeding roller 5. The feeding roller 5 rotates under the drive of the reducer 3, and the powder in the powder storage box 1 flows and fills into the quantitative groove of the feeding roller 5 to complete the powder spreading. In specific applications, in order to trigger a warning when the remaining powder in the powder storage box 1 is insufficient, the reducer 3 is also connected to the alarm for communication. When the reducer 3 drives the feeding roller 5 to rotate a certain number of times, the alarm automatically triggers an alarm to remind the workers to add powder in time to prevent the interruption of the production process; the feeding plate 6 is arc-shaped, and the feeding plate 6 is arranged on the outer surface of the feeding roller 5. The bottom of the unloading plate 6 is provided with a gap, and the unloading plate 6 is used to prevent the centrifugal force when the unloading roller 5 rotates, causing the powder to be scattered randomly, and at the same time, the powder can be evenly guided to the buffer plate 4 in a waterfall manner. The powder in the powder storage box 1 passes through the unloading roller 5, the unloading plate 6 and the buffer plate 4 in turn and then falls on the thermal transfer film 7. The thermal transfer film 7 has a printed pattern, and the scattered powder will cover the printed pattern; the adjusting cylinder 11, the waste powder box 10 and the thermal transfer film adjusting roller 8 are connected in sequence, the thermal transfer film adjusting roller 8 is located above the waste powder box 10, and the adjusting cylinder 11 is used to adjust the waste powder box 10. The vertical height of the powder box 10 and the thermal transfer film adjusting roller 8 further adjusts the horizontal angle of the thermal transfer film 7. The rising height of the waste powder box 10 and the thermal transfer film adjusting roller 8 is determined by the extension length of the adjusting cylinder 11. Since the thermal transfer film 7 is in a flat and stretched state during the thermal transfer process, it can be understood that the higher the rising height of the waste powder box 10 and the thermal transfer film adjusting roller 8, the smaller the angle between the thermal transfer film 7 and the horizontal plane, the more fully the scattered powder covers the thermal transfer film 7, and the larger the pattern printed on the thermal transfer film 7, the greater the amount of ink used; Figure 4-Figure 5As shown, it is assumed that the angle between the thermal transfer film 7 and the horizontal plane is θ, and θ changes with the rising height of the waste powder box 10 and the thermal transfer film adjusting roller 8. In actual application, in order to meet the printing requirements of various patterns under different ink amounts and reduce the impact on the quality of the printed patterns, preferably, the horizontal angle range θ of the thermal transfer film 7 is between 45°-75°, that is: 45°≤θ≤75°. Within this angle range, the effect of powder adhering to the pattern will be better; the shaking plate 9 and the shaking motor 12 are connected, and the shaking plate 9 and the shaking motor 12 are arranged on the travel path of the thermal transfer film 7. The shaking plate 9 and the shaking motor 12 are used to shake the residual powder on the thermal transfer film 7 into the waste powder box 10, which can ensure that there are no extra spots on the pattern during printing, improve the printing quality, and also realize the recovery and reuse of the powder.

[0057] Embodiment 2:

[0058] Based on the same general technical concept of Example 1, this Example 2 provides a quantitative powder shaking method of a powder shaking machine, using the quantitative powder shaking device of the powder shaking machine described in Example 1, such as Figure 6 As shown, including:

[0059] S10, calculate the required amount of powder to be sprinkled under the unit area pattern, and establish a corresponding relationship between the amount of powder to be sprinkled by the discharge roller 5 and the powder sprinkling time according to the calculation result, and calculate the rotation speed of the reducer 3 in different time periods according to the corresponding relationship, and then adjust the amount of powder to be sprinkled by the discharge roller 5 in the corresponding time period.

[0060] The thermal transfer film 7 is slowly moved and rolled up in the powder shaking machine, and the position where the pattern on the thermal transfer film 7 can contact the powder is also limited, starting from the bottom of the buffer plate 4 to the position away from the waste powder box 10, which corresponds to Figure 3 The position from A to B on the thermal transfer film 7 is the same as the position from A to B. Therefore, when considering the demand for powder of a pattern, only the demand for powder of a certain pattern from A to B needs to be considered; in addition, the demand for powder of a pattern is also proportional to the area of ​​the pattern. The larger the area of ​​the pattern, the larger the amount of powder required. The above principles and processes are applicable to both test patterns and patterns to be printed. In order to obtain the amount of powder required for a pattern per unit area, a standard test pattern is usually used as the test object in specific applications.

[0061] At the beginning of the test, there is no powder on the thermal transfer film 7 and in the waste powder box 10, and there is powder only in the quantitative groove of the feed roller 5. When the powder shaking machine is running, the reducer 3 drives the feed roller 5 to rotate and sprinkle powder at the maximum speed until the test pattern moves to B, then the reducer 3 stops rotating and the feed roller 5 stops sprinkling powder.

[0062] In S10, the calculation of the required amount of powder to be spread per unit area pattern specifically includes:

[0063] The feed roller 5 is driven at the maximum speed by the reducer 3 so that the powder in the quantitative groove of the feed roller 5 is scattered on the thermal transfer film 7 after passing through the buffer plate 4; at the same time, the area of ​​the test pattern on the thermal transfer film 7 and the travel of the test pattern with the transfer film 7 are recorded.

[0064] In this step, it is assumed that the maximum speed of the reducer 3 is n0 (unit: r / min), the reduction ratio of the reducer 3 is i, the amount of powder in the quantitative groove of the unloading roller 5 is m0 (unit: g), and the area of ​​the test pattern on the thermal transfer film 7 is S0 (unit: m 2 ), the length of the test pattern from A to B is L0 (unit: mm), and the moving and winding speed of the thermal transfer film 7 is v0 (mm / s).

[0065] The powder sprinkling time of the discharge roller 5 at the end of the test pattern stroke is recorded, the powder remaining on the buffer plate 4 and the thermal transfer film 7 is collected into the waste powder box 10 and the weight gain of the buffer plate 4 is recorded; the average powder sprinkling speed of the discharge roller 5 is calculated according to the maximum speed and reduction ratio of the reducer 3.

[0066] In this step, the collecting method includes but is not limited to using a fine brush to sweep the residual powder on the buffer plate 4 and the thermal transfer film 7 into the waste powder box 10 to reduce the test error.

[0067] In this step, it is assumed that the powder sprinkling time of the feed roller 5 is t0 (unit: s), the weight increase of the waste toner box 10 is Δm (unit: g), and the average powder sprinkling speed of the feed roller 5 is Δm1 (unit: g / min).

[0068] Then we have:

[0069]

[0070] The amount of powder attached to the test pattern is calculated, and the amount of powder required to be spread per unit area of ​​the pattern is calculated based on the amount of powder attached to the test pattern and the area of ​​the test pattern.

[0071] In this step, assume that the amount of powder attached to the test pattern is m (unit: g), and the amount of powder required per unit area of ​​the pattern is M (g / m 2 ).

[0072] Then we have:

[0073]

[0074] Further, there are:

[0075]

[0076] Through the above steps and calculation methods, the required powder sprinkling amount M under the unit area pattern is calculated. Using the required powder sprinkling amount M under the unit area pattern, the corresponding relationship between the powder sprinkling amount and the powder sprinkling time of the feed roller 5 can be established, so that the powder sprinkling speed of the feed roller 5 can be adaptively adjusted according to the pattern to be printed.

[0077] In S10, the corresponding relationship between the powder spreading amount and the powder spreading time of the feeding roller 5 is established, specifically including:

[0078] The starting point of the pattern to be printed is taken as time zero; the corresponding moving distance of the pattern to be printed in each interval time period starting from time zero is used to calculate the area of ​​the pattern to be printed under the width of the moving distance and the amount of powder required for the area; according to the completion time corresponding to the required amount of powder, the powder amount and powder time sequence of the unloading roller 5 are constructed.

[0079] In this step, the starting point of the printed pattern is point A. In the subsequent calculation process, point A is also used as the time zero. (Unit: s), the pattern moving distance is (Unit: mm), the area of ​​the pattern to be printed (m 2 ),area (m 2 The required amount of powder is (Unit: g).

[0080] Since the printed pattern is known, each The area of ​​the pattern to be printed within the width range ΔS (m 2 The required amount of powder is .

[0081] Then we have:

[0082]

[0083] Because each The amount of powder needs to be After the time is up, the powder spreading amount of the unloading roller 5 in the time series T (unit: s) can be established. (Unit: g) Corresponding value:

[0084]

[0085] Among them, T is the time series when the pattern reaches A, that is, time zero, is the kth Time thermal transfer film 7 travels to A The area of ​​the width pattern, is the kth time The amount of powder required for the area pattern.

[0086] When the amount of powder After determination, the amount of powder can be further calculated The corresponding speed n of reducer 3 (unit: r / min) is The relationship with n is:

[0087]

[0088] From the above formula, we have:

[0089]

[0090] Correspondingly, the motor speed Δn during the kth Δt time k for:

[0091]

[0092] The above calculation process obtains the rotation speed of the reducer 3 in different time periods. According to the input of the required printing pattern, the rotation speed of the reducer 3 can be changed in real time to achieve an almost constant amount of powder on the thermal transfer film 7, which can meet the powder amount requirements of various patterns and realize adaptive control of the required printing pattern.

[0093] S20, dividing the pattern according to the area ratio of the pattern to be printed to the entire image, and adjusting the horizontal angle of the thermal transfer film 7 according to the division result.

[0094] In actual application, since the patterns to be printed are large or small, the larger the pattern, the larger the amount of ink required, and correspondingly, the larger the amount of powder required. The thermal transfer film 7 serves as the carrier of the pattern to be printed. During the printing process, the horizontal angle of the thermal transfer film 7 has an important influence on the printing quality of patterns of different sizes. Considering the above practical situation, in order to increase the application scope of the powder shaking machine and ensure the printing quality of patterns of different sizes, it is necessary to divide the patterns to be printed. The basis for the division is determined by referring to the area ratio of the pattern to be printed to the entire image, and then the horizontal angle of the thermal transfer film 7 is adjusted to the corresponding angle according to the result of the division.

[0095] In S20, the pattern is divided according to the area ratio of the pattern to be printed to the entire image, specifically including: when the area ratio exceeds 70%, the pattern is divided into a large ink volume pattern; when the area ratio is between 70%-40%, it corresponds to a medium ink volume pattern; when the area ratio is less than 40%, it corresponds to a small ink volume pattern; further, in S20, according to the result of the division, the horizontal angle of the thermal transfer film 7 is adjusted, specifically including: when the pattern is a large ink volume pattern, the horizontal angle of the thermal transfer film 7 is adjusted to 45°; when the pattern is a medium ink volume pattern, the horizontal angle of the thermal transfer film 7 is adjusted to 60°; when the pattern is a small ink volume pattern, the horizontal angle of the thermal transfer film 7 is adjusted to 75°.

[0096] Through the above-mentioned division process and angle adjustment process, the printing requirements of various patterns with large ink volume, medium ink volume and small ink volume can be met, and at the same time the printing quality of various patterns can be guaranteed.

[0097] In actual application, when the pattern to be printed on the thermal transfer film 7 passes through point A, even if the angle between the thermal transfer film 7 and the horizontal plane is At the preferred angles of 45°, 60° and 75°, some powder still falls from point A and does not fall directly on the thermal transfer film 7 but deviates from the thermal transfer film 7 and falls directly on the bottom of the thermal transfer film 7. Figure 5 As shown, this powder trajectory will cause powder loss. The bigger it is, the greater the powder loss.

[0098] In order to reduce the above losses, as one of the implementation methods:

[0099] In S20, it also includes: after the horizontal angle adjustment of the thermal transfer film 7 is completed, compensating the powder spreading amount of the unloading roller 5 of the thermal transfer film 7 at the corresponding horizontal angle.

[0100] During actual application, the compensation for the powder amount of the feed roller 5 at the corresponding horizontal angle of the thermal transfer film 7 specifically includes: adding an initial amount of powder at the bottom of the thermal transfer film 7, and obtaining the powder amount of the feed roller 5 and the powder collected by the waste powder box 10 after printing for a certain period of time; calculating the loss coefficient using the powder amount of the feed roller 5 and the powder collected by the waste powder box 10, and compensating the calculated rotation speed of the reducer 3 by the loss coefficient to compensate for the powder amount of the thermal transfer film 7 at the corresponding horizontal angle.

[0101] In this step, since the loss of powder is mainly related to θ, the loss coefficient can be obtained through the powder sprinkling test at the above three different angles.

[0102] Assume that the loss coefficients at θ=45°, 60°, and 75° are k0=k1, k2, and k 3，Among them, k1, k2, k3>1, the amount of powder scattered by the feeding roller 5 is m4, and the amount of powder dropped by the waste toner box 10 is m4.

[0103] Taking the angle θ=45 when printing a large amount of ink as an example, we have:

[0104]

[0105] Similarly, the values ​​of loss coefficients k2 and k3 can be obtained.

[0106] After the loss coefficient k0 is obtained through the above calculation process, the speed Δn of the reducer 3 obtained by the above S10 calculation can be k After compensation, considering the loss coefficient k0, the motor speed Δn k for:

[0107]

[0108] S30, obtaining the remaining powder amount in the powder storage box 1 by calculation, and triggering an automatic warning when the remaining powder amount in the powder storage box 1 is lower than the set threshold value according to the set threshold value.

[0109] In S30, the amount of powder remaining in the powder storage box 1 is obtained by calculation, and according to the set threshold, an automatic warning is triggered when the amount of powder remaining in the powder storage box 1 is lower than the set threshold, specifically including: adding a fixed amount of powder to the powder storage box 1, and entering the fixed amount of powder into the system; setting the reducer 3 according to the calculated rotational speed of the reducer 3, and after printing for a certain period of time, calculating the amount of powder sprinkled by the feed roller 5 and the amount of powder remaining in the powder storage box 1; and comparing the amount of powder remaining in the powder storage box 1 with the set threshold.

[0110] In this step, it is assumed that the fixed amount of powder added to the powder storage box 1 is m2 (unit: g), the speed of the reducer 3 is n, and after printing for a certain period of time, the amount of powder remaining in the powder storage box 1 is m3 (unit: g)

[0111] Then we have:

[0112]

[0113] After calculating the remaining powder amount m3 in the powder storage box 1, m3 is compared with the threshold set by the system. When m3 is lower than the set threshold, an automatic warning is triggered, thereby avoiding problems such as scrapping of some printed patterns and shutdown for adding powder due to insufficient powder, thereby improving production efficiency and stability.

[0114] In summary, the present invention provides a quantitative powder shaking device of a powder shaking machine and a powder shaking method thereof, which can adjust the amount of powder sprinkled to achieve adaptive control of different patterns, and can adjust the angle of the thermal transfer film to achieve different powder shaking effects; in addition, the present invention can also automatically predict when the amount of powder in the powder storage box is insufficient, thereby ensuring the continuity of production and improving production efficiency.

[0115] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A quantitative powder shaking method of a powder shaking machine, characterized in that: A quantitative powder shaking device of a powder shaking machine is used, the quantitative powder shaking device of the powder shaking machine comprising a powder storage box (1), a feed roller support seat (2), a reducer (3), a buffer plate (4), a feed roller (5), a feed plate (6), a thermal transfer film (7), a thermal transfer film adjustment roller (8), a shaking plate (9), a waste powder box (10), an adjustment cylinder (11) and a shaking motor (12); The feed roller support seat (2) and the reducer (3) are respectively connected to the feed roller (5), the feed roller (5) is located below the powder storage box (1), the outer surface of the feed roller (5) is provided with a quantitative groove, and the bottom of the feed plate (6) is provided with a gap, and the powder in the powder storage box (1) is sequentially scattered on the thermal transfer film (7) after passing through the feed roller (5), the feed plate (6) and the buffer plate (4); the regulating cylinder (11), the waste powder box (10) and the thermal transfer film regulating roller (8) are sequentially connected, and the regulating cylinder (11) is used to adjust the vertical height of the waste powder box (10) and the thermal transfer film regulating roller (8) and thus adjust the horizontal angle of the thermal transfer film (7); the shaking plate (9) and the shaking motor (12) are connected, and the shaking plate (9) and the shaking motor (12) are used to shake the powder remaining on the thermal transfer film (7) into the waste powder box (10); The horizontal angle range of the thermal transfer film (7) is between 45° and 75°; The quantitative powder shaking method comprises: S10, calculating the required amount of powder to be sprinkled under the unit area pattern, establishing a corresponding relationship between the amount of powder sprinkled by the unloading roller (5) and the powder sprinkle time according to the calculation result, calculating the rotation speed of the reducer (3) in different time periods according to the corresponding relationship, and then adjusting the amount of powder sprinkled by the unloading roller (5) in the corresponding time period; S20, dividing the pattern according to the area ratio of the pattern to be printed to the entire image, and adjusting the horizontal angle of the thermal transfer film (7) according to the division result; S30, obtaining the amount of powder remaining in the powder storage box (1) by calculation, and triggering an automatic warning when the amount of powder remaining in the powder storage box (1) is lower than the set threshold value according to the set threshold value; In S10, the calculation of the required amount of powder to be spread per unit area pattern specifically includes: The unloading roller (5) is driven at a maximum speed by a speed reducer (3), so that the powder in the quantitative groove of the unloading roller (5) is scattered onto the thermal transfer film (7) after passing through the buffer plate (4); at the same time, the area of ​​the test pattern on the thermal transfer film (7) and the travel of the test pattern along with the transfer film (7) are recorded; The powder sprinkling time of the feed roller (5) at the end of the test pattern stroke is recorded, the powder remaining on the buffer plate (4) and the thermal transfer film (7) is collected into the waste powder box (10), and the weight gain of the waste powder box (10) is recorded; the average powder sprinkling speed of the feed roller (5) is calculated based on the maximum rotation speed and reduction ratio of the reducer (3); The amount of powder attached to the test pattern is calculated, and the amount of powder required to be spread per unit area of ​​the pattern is calculated based on the amount of powder attached to the test pattern and the area of ​​the test pattern.

2. The quantitative powder shaking method of the powder shaking machine according to claim 1, characterized in that: In S10, the step of establishing the corresponding relationship between the powder spreading amount and the powder spreading time of the unloading roller (5) specifically includes: The starting point of the pattern to be printed is taken as the time zero; The moving distance corresponding to each time interval of the pattern to be printed starting from time zero is used to calculate the area of ​​the pattern to be printed within the moving distance width and the amount of powder required for the area. According to the completion time corresponding to the required amount of powder, a sequence of the amount of powder and the time of powdering of the unloading roller (5) is constructed.

3. The quantitative powder shaking method of the powder shaking machine according to claim 2, characterized in that: In S20, the pattern to be printed is divided according to the area ratio of the pattern to be printed to the entire image, specifically including: When the area ratio exceeds 70%, the pattern is classified as a large ink volume pattern; When the area ratio is between 40% and 70%, it corresponds to a medium ink volume pattern; When the area ratio is less than 40%, it corresponds to a small ink volume pattern.

4. The quantitative powder shaking method of the powder shaking machine according to claim 3, characterized in that: In S20, according to the division result, the horizontal angle of the thermal transfer film (7) is adjusted, specifically including: When the pattern is a pattern with a large amount of ink, the horizontal angle of the thermal transfer film (7) is adjusted to 45°; When the pattern is a medium ink volume pattern, the horizontal angle of the thermal transfer film (7) is adjusted to 60°; When the pattern is a small ink volume pattern, the horizontal angle of the thermal transfer film (7) is adjusted to 75°.

5. The quantitative powder shaking method of the powder shaking machine according to claim 1, characterized in that: In S20, it also includes: after the horizontal angle adjustment of the thermal transfer film (7) is completed, compensating for the amount of powder sprinkled by the unloading roller (5) at the corresponding horizontal angle of the thermal transfer film (7).

6. The quantitative powder shaking method of the powder shaking machine according to claim 5, characterized in that: The method of compensating the amount of powder sprinkled by the unloading roller (5) at a corresponding horizontal angle on the thermal transfer film (7) specifically includes: Adding an initial amount of powder to the bottom of the thermal transfer film (7), and after printing for a certain period of time, obtaining the amount of powder spread by the feed roller (5) and the amount of powder collected by the waste powder box (10); The loss coefficient is calculated using the powder spreading amount of the feed roller (5) and the powder collection amount of the waste powder box (10), and the calculated rotation speed of the reducer (3) is compensated by the loss coefficient to compensate for the powder spreading amount of the feed roller (5) at the corresponding horizontal angle of the thermal transfer film (7).

7. The quantitative powder shaking method of the powder shaking machine according to claim 1, characterized in that: In S30, the remaining amount of powder in the powder storage box (1) is obtained by calculation, and according to a set threshold, when the remaining amount of powder in the powder storage box (1) is lower than the set threshold, an automatic warning is triggered, which specifically includes: Add a fixed amount of powder into the powder storage box (1), and enter the fixed amount of powder into the system; The speed reducer (3) is set according to the calculated speed of the speed reducer (3), and after printing for a certain period of time, the amount of powder sprinkled by the discharge roller (5) and the amount of powder remaining in the powder storage box (1) are calculated; The remaining powder amount in the powder storage box (1) is compared with the set threshold value.

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