CN112222401A - Tablet press and method for preparing thermal battery heating plate by using same - Google Patents
Tablet press and method for preparing thermal battery heating plate by using same Download PDFInfo
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- CN112222401A CN112222401A CN202010967825.6A CN202010967825A CN112222401A CN 112222401 A CN112222401 A CN 112222401A CN 202010967825 A CN202010967825 A CN 202010967825A CN 112222401 A CN112222401 A CN 112222401A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims description 26
- 239000000843 powder Substances 0.000 claims abstract description 116
- 238000011049 filling Methods 0.000 claims abstract description 47
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000004080 punching Methods 0.000 claims abstract description 12
- 150000003839 salts Chemical class 0.000 claims description 18
- 230000005496 eutectics Effects 0.000 claims description 16
- 238000007790 scraping Methods 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 12
- AXZAYXJCENRGIM-UHFFFAOYSA-J dipotassium;tetrabromoplatinum(2-) Chemical compound [K+].[K+].[Br-].[Br-].[Br-].[Br-].[Pt+2] AXZAYXJCENRGIM-UHFFFAOYSA-J 0.000 claims description 11
- 229910001487 potassium perchlorate Inorganic materials 0.000 claims description 11
- 238000003892 spreading Methods 0.000 claims description 10
- 230000007480 spreading Effects 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 9
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 4
- 235000011194 food seasoning agent Nutrition 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000009475 tablet pressing Methods 0.000 claims 1
- 239000000945 filler Substances 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 4
- 238000000275 quality assurance Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 12
- 239000000306 component Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000010416 ion conductor Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/30—Deferred-action cells
- H01M6/36—Deferred-action cells containing electrolyte and made operational by physical means, e.g. thermal cells
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
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- Mechanical Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The scheme discloses a tablet press in the field of processing equipment of thermal battery heating plates, which comprises a rack and a powder box, wherein an upper mold core and a lower mold core are vertically and slidably connected to the rack, a middle mold is positioned between the upper mold core and the lower mold core, and the upper mold core and the lower mold core are both connected with hydraulic mechanisms; the upper die core comprises an upper die joint and a plurality of upper punch heads connected to the lower surface of the upper die joint, and the lower die core comprises a lower die joint and a plurality of lower punch heads connected to the upper surface of the lower die joint; the middle die is provided with a plurality of filling holes, and an upper punching head and a lower punching head are connected in a seamless sliding mode in each filling hole. This scheme does not need the manual work to carry out the operation of concrete link, for example filler, stand powder, preforming etc. once only realizes the processing of multi-disc heating plate, and production efficiency improves, and the quality assurance uniformity moreover has overcome the great error that personal factor leads to when manual operation, has stronger maneuverability.
Description
Technical Field
The invention belongs to the field of processing equipment of thermal battery heating plates, and particularly relates to a tablet press and a method for preparing a thermal battery heating plate by using the same.
Background
Along with the transformation of modern war operation modes, weapons of weapon systems are rapidly developed in the directions of informatization, intensification, miniaturization, motorization and the like, and the weapons also put forward higher requirements on a matched power supply. The application background of the miniaturized thermal battery is based on the thermal battery widely used in the field of weapons such as intelligent cannonballs and rocket projectiles, and the miniaturized thermal battery has the remarkable characteristics of small size, large batch size, low price and the like.
The heating sheet is used as a core component of the thermal battery, the components of the heating sheet mainly comprise iron powder and potassium perchlorate, on one hand, the action of the heating powder in the heating sheet enables solid molten salt electrolyte to become an ion conductor with high conductivity in a high-temperature state, and on the other hand, excessive iron powder still has high electronic conductivity in the heating sheet. However, the heating powder is composed of high-activity iron powder and potassium perchlorate which is a strong oxidant, particularly, the potassium perchlorate belongs to easily exploded class A substances, and is easy to explode under the action of high temperature, collision and the like, and is easy to explode together with the high-activity iron powder.
However, the existing domestic thermal battery heating plate is prepared by adopting a semi-automatic powder hydraulic pressing forming process. The basic process for preparing the conventional heating plate comprises the working procedures of hydraulic press pressure setting, powder weighing, powder scraping, pressing, demolding, inspection and the like, all the steps are manually operated, and only 30s can a heating plate be prepared by people. In order to meet the actual production requirements, one tablet making group is required to be equipped with 5-8 skilled workers to prepare the heating plate, and the size of the heating plate is generally between phi 22mm and phi 110 mm. Because the thermal battery heating powder has special chemical components, fine and light granularity and poor fluidity, and the special use determines that the heating powder cannot be granulated, the advanced powder material forming process in the ceramic or pharmaceutical industry, namely the full-automatic tabletting technology, cannot be directly used for producing and preparing thermal battery heating plates.
Therefore, the current preparation of miniaturized heat battery heating sheets has the following problems:
(1) the potential safety hazard is great. Due to the special chemical properties of the heating material, in the semi-automatic powder hydraulic process, high-activity heating powder can explode in the mechanical extrusion process of the hydraulic press, so that personnel can be scalded, and even fire can be caused. Meanwhile, the manufacturing of the miniaturized thermal battery takes the rapid preparation of the electrode as a key task, and if the rapid action and the high-speed pressing of a hydraulic press are carried out under the condition of manual intervention, the safety problem cannot be ignored.
(2) Small-sized electrodes with stable processes cannot be prepared. In a manual operation mode, the method is suitable for preparing large-size electrodes, and when the size of the heating plate is less than phi 16mm, manual powder spreading and scraping operations are difficult to perform. The size of the electrode heating sheet of the miniaturized thermal battery is generally between 8mm phi and 18mm phi, the size of the electrode heating sheet is small, the powder quantity is small, and the molding quality of the heating sheet cannot be ensured by manually weighing, spreading and tabletting by adopting a conventional large electrode preparation process mode.
(3) Thin electrodes with good flatness cannot be prepared, due to the manual powder spreading mode, the thin electrodes cannot be flattened under the condition of small powder consumption, fine air bubbles or pores in the powder can greatly affect the flatness of the electrodes, and the prepared electrodes are often uneven in thickness.
(4) The requirement of mass production cannot be met. The conventional tabletting method has the defects of poor process operability, low production efficiency, poor quality consistency and the like, and can not meet the mass production requirement of tens of thousands of miniaturized thermal batteries in a mass production mode of the miniaturized batteries.
Therefore, the preparation of the small-sized heating plate of the thermal battery becomes a technical problem which restricts the miniaturization of the thermal battery and needs to be broken through.
Disclosure of Invention
The invention aims to provide equipment for preparing a heating plate of a thermal battery, and solves the problems that in the prior art, the preparation process of a small and medium-sized heating plate of the thermal battery is poor in operability, extremely low in production efficiency and poor in quality consistency of the heating plate.
The tablet press in the scheme comprises a rack and a powder box; the upper mold core and the lower mold core are connected to the rack in a vertical sliding manner, the middle mold positioned between the upper mold core and the lower mold core is also connected to the rack, and the upper mold core and the lower mold core are both connected with a first hydraulic mechanism for driving the upper mold core and the lower mold core to slide in the vertical direction; the upper die core comprises an upper die joint and a plurality of upper punching heads connected to the lower surface of the upper die joint, and the lower die core comprises a lower die joint and a plurality of lower punching heads connected to the upper surface of the lower die joint;
the middle die is provided with a plurality of filling holes, and an upper punching head and a lower punching head are connected in a seamless sliding mode in each filling hole; the powder box is connected with a second hydraulic mechanism which drives the powder box to horizontally slide, a discharge hole is formed in the bottom of the powder box, and the bottom of the powder box is in sliding butt joint with the upper surface of the middle die.
The bottom of powder box sets up the discharge gate in this scheme, when powder box reciprocating motion under the drive of second hydraulic mechanism, when through the filler hole, during the heating powder in the powder box leaks the filler hole, reciprocal back many times for the heating powder in every filler hole all with well mould upper surface level, and then all even packing heating powder in every filler hole. The lifting and the falling of the lower die core are controlled by the first hydraulic mechanism, so that the length of the lower punch head in the filling hole is adjusted, and the depth of the heating powder which can be filled in the filling hole is adjusted. The pressure applied to the filling hole by the upper die core is adjusted through the first hydraulic mechanism connected with the upper die core, so that tabletting is realized, and the dwell time is realized by the stay of the upper punch head in the filling hole.
In conclusion, the scheme does not need manual operation of specific links, such as filling, powder spreading, tabletting and the like, processing of a plurality of heating sheets is realized at one time, production efficiency is improved, quality is guaranteed to be consistent, large errors caused by personal factors during manual operation are overcome, and the method has high operability.
Furthermore, the middle die is connected with a slide rail, and the side wall of the powder box is in sliding connection with the slide rail. The slide rail can strengthen the stability of powder box slip in-process and restriction slip orbit for it is better to fill the homogeneity of heating powder.
Furthermore, a plurality of the packing holes are arranged in a rectangular array. The arrangement is regular, and the utilization rate of the middle mould is improved.
Furthermore, the side walls of the middle die and the filling hole are coated with zirconia materials, and the slide rail is provided with an ion air knife. The ionic wind generated by the ionic wind knife directly sweeps the surface of the middle die so as to quickly eliminate static electricity generated by the friction of the powder box and the surface layer of the middle die due to reciprocating motion and improve the safety performance of the tablet press.
The tablet press further comprises a single chip microcomputer, and the first hydraulic mechanism and the second hydraulic mechanism are in electric signal connection with the single chip microcomputer; the singlechip comprises:
the filling depth module is used for controlling the displacement of a first hydraulic mechanism connected with the lower die core;
the forming pressure module is used for controlling the displacement and the residence time of a first hydraulic mechanism connected with the upper die core;
and the powder scraping module is used for controlling the times of the second hydraulic mechanism for driving the powder box to reciprocate and scraping powder.
The tablet press is automatically and intelligently enhanced by setting parameters such as filler depth, powder scraping times, forming pressure, pressure maintaining time and the like in the single chip microcomputer.
The invention also provides a method for preparing a thermal battery heating plate by using the tablet press, which comprises the following steps:
step one, preparation of heating powder: mixing active iron powder, potassium perchlorate and multi-element inorganic eutectic fused salt containing KF, KCl and KBr according to a certain proportion to obtain heating powder, and filling the heating powder into a powder box;
step two, parameter setting: setting related parameters of filling depth, powder scraping times, forming pressure and pressure maintaining time in a single chip microcomputer of the tablet press according to actual needs;
step three, spreading powder: after the single chip microcomputer is started, the first hydraulic mechanism connected with the lower die core drives the length of the lower punch head in the filling hole so as to adjust the filling depth of each seasoning hole; the second hydraulic mechanism drives the powder box to reciprocate on the filling hole, and the heating powder in the powder box is filled into the filling hole after leaking out of a discharge hole at the bottom of the powder box;
after the filling hole is filled with the heating powder, a first hydraulic mechanism connected with the upper die core drives an upper punch head to be pressed into the filling hole, the set displacement is achieved, pressure is maintained for a certain time, and then the upper die core is lifted back to the original position;
step five, demolding and taking the slices: and lifting the lower mold core to the horizontal position of the middle mold, and pushing the pressed heating sheet to a sheet collecting area by the reciprocating motion of the powder box to finish demolding, sheet taking and powder spreading again.
Further, in the first step, the mass fraction of the active iron powder is 57-84%, the mass fraction of the potassium perchlorate is 8-17%, and the mass fraction of the inorganic eutectic molten salt is 5-30%.
Further, in the first step, the proportions of the components in the multi-element inorganic eutectic molten salt in the total amount of the multi-element inorganic eutectic molten salt are as follows: 5 to 30 percent of KF, 5 to 90 percent of KCl and 5 to 90 percent of KBr.
Further, the granularity of the multi-element inorganic eutectic molten salt is 60-100 meshes.
In the process, on one hand, the inorganic phase change molten salt, namely the multi-element eutectic molten salt consisting of KF, KCl and KBr is used for modifying the conventional heating powder, so that the problem of flowability of the conventional heating powder is solved. The heat release in the heating powder is from the oxidation-reduction reaction of the iron powder and the potassium perchlorate, and in order to ensure the combustion reliability and the heat release efficiency of the heating plate, the active iron powder and the potassium perchlorate which are raw materials of the heating plate have strict granularity requirements, and are generally controlled to be more than 300 meshes. However, the heating powder is too fine, which is disadvantageous to the formability of the heating sheet. Because the finer the powder, the lighter the particle and the poorer the flowability, the heating powder cannot be uniformly filled into the middle die hole during powder scraping, resulting in poor forming consistency of the heating sheet. According to the invention, the inorganic eutectic molten salt is modified by adding a certain proportion of the inorganic eutectic molten salt into the conventional heating powder, and the flowability of the heating powder is obviously improved by utilizing the characteristics of large particles and large specific gravity of the inorganic eutectic molten salt, so that the problem of effective quantification of the heating powder in the preparation process of the heating plate is solved.
On the other hand, the main components of the heating powder of the thermal battery, namely the active iron powder and the potassium perchlorate, are extremely sensitive to static electricity and magnetism, and the powder is inflammable and explosive. Aiming at the special physicochemical property of the heating powder of the thermal battery, an ion air knife is adopted to remove static electricity generated in the working process of the equipment, a punching die with a zirconia material surface layer is adopted to solve the magnetism generated in the working process of the equipment, and the consistency of filling the heating powder in each punching die pit is ensured by scraping the powder for many times. The tablet press disclosed by the invention is combined with a preparation process, has the remarkable advantages of high production efficiency, good product consistency, high qualification rate and the like for producing the miniaturized thermal battery heating plate, and has extremely high engineering application value.
Drawings
Fig. 1 is a schematic structural diagram of a tablet press machine according to the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises an upper punch 1, a middle die 2, a lower punch 3, a filling hole 4, a powder box 5 and a slide rail 6.
Example 1, substantially as shown in figure 1: a tablet press comprises a single chip microcomputer, a frame and a powder box 5; the upper mold core and the lower mold core are vertically and slidably connected to the rack, the middle mold 2 positioned between the upper mold core and the lower mold core is also connected to the rack, and the upper mold core and the lower mold core are both connected with a first hydraulic mechanism for driving the upper mold core and the lower mold core to vertically slide; the upper die core comprises an upper die joint and a plurality of upper punch heads 1 connected to the lower surface of the upper die joint, and the lower die core comprises a lower die joint and a plurality of lower punch heads 3 connected to the upper surface of the lower die joint.
The middle die 2 is connected with a slide rail 6 and is also provided with a plurality of filler holes 4 which are arranged in a rectangular array, and an upper punch 1 and a lower punch 3 are connected in each filler hole 4 in a seamless sliding manner; powder box 5 is connected with second hydraulic mechanism, and the bottom of powder box 5 is equipped with the discharge gate, and the bottom of powder box 5 and the upper surface slip butt of well mould 2, the lateral wall and the 6 sliding connection of slide rail of powder box 5. The side walls of the middle die 2 and the filling hole 4 are coated with zirconia materials, and the outer side of the sliding rail is provided with an ion air knife.
The first hydraulic mechanism and the second hydraulic mechanism are electrically connected with the single chip microcomputer; the singlechip comprises:
the filling depth module is used for controlling the displacement of a first hydraulic mechanism connected with the lower die core;
the forming pressure module is used for controlling the displacement and the residence time of a first hydraulic mechanism connected with the upper die core;
and the powder scraping module is used for controlling the times of the second hydraulic mechanism driving the powder box 5 to reciprocate and scrape the powder.
A method of making a thermal battery heat plate using the tablet press of example 1, comprising the steps of:
step one, preparation of heating powder: mixing active iron powder, potassium perchlorate and multi-element eutectic molten salt containing KF, KCl and KBr to obtain heating powder, and filling the heating powder into a powder box 5;
step two, parameter setting: setting related parameters of filling depth, powder scraping times, forming pressure and pressure maintaining time in a single chip microcomputer of the tablet press according to actual needs;
step three, spreading powder: after the singlechip is started, the length of the lower punch 3 in the filling hole 4 is adjusted through a hydraulic mechanism connected with the lower die core, and then the filling depth of each seasoning hole is adjusted; the hydraulic mechanism drives the powder box 5 to reciprocate on the filling hole 4, and the heating powder in the powder box 5 is filled into the filling hole 4 after leaking out of a discharge hole at the bottom of the powder box 5;
step four, after the filling hole 4 is filled with the heating powder, a hydraulic mechanism connected with the upper die core drives an upper punch head to be pressed into the filling hole 4, the set displacement is achieved, the pressure is maintained for a certain time, and then the upper die core is lifted back to the original position;
step five, demolding and taking the slices: the lower die core is lifted to the horizontal position of the middle die 2, the powder box 5 reciprocates to push the pressed heating plate to the plate collecting area, so that the demoulding and the plate taking are completed, and the powder spreading process is carried out again.
The specific embodiment based on the method is as follows:
table 1: composition of multi-element inorganic eutectic molten salt and weight proportion of each component
TABLE 2 composition of the heating powder and the weight ratio of the components
Taking example 2 as an example, in step two, the parameters are set as follows:
a first group: the filling depth is 1mm, the powder scraping times are 5 times, the forming pressure is 240KN, and the pressure maintaining time is 2 s.
The thickness of the heating plate pressed and formed by combining the integral process is 0.3 mm.
Second group: the filling depth is 2mm, the powder scraping times are 3 times, the forming pressure is 280KN, and the pressure maintaining time is 1 s.
The thickness of the heating plate pressed and formed by combining the integral process is 0.5 mm.
In addition, the filling depth, the powder scraping times and the molding pressure can be set according to the actual requirements of the product in actual work, which is common knowledge for those skilled in the art, and detailed description is not repeated here.
The scheme solves the difficult problem of flowability of the heating powder through modification of the heating powder, and solves the problems of poor operability, extremely low production efficiency and poor quality consistency of the existing preparation process of the miniaturized thermal battery heating sheet by adopting the tablet press provided by the invention. This patent can directly realize the full automated preparation of miniaturized thermal battery heating plate, has following advantage:
1. the minimum size of the heating plate of the thermal battery can be reduced from the prior phi 22mm to phi 8 mm;
2. the minimum thickness of the heating plate of the thermal battery is reduced from the existing 0.5mm to 0.3 mm;
3. the manufacturing efficiency is greatly improved, and the average tabletting speed is improved from 1 tablet/min to 60 tablets/min;
4. the number of workers is reduced, and the labor cost is saved.
Can better meet the production requirements of mass production and low cost of the miniaturized thermal batteries.
Claims (9)
1. A tablet press, comprising a frame, characterized in that: also comprises a powder box; the upper mold core and the lower mold core are connected to the rack in a vertical sliding manner, the middle mold positioned between the upper mold core and the lower mold core is also connected to the rack, and the upper mold core and the lower mold core are both connected with a first hydraulic mechanism for driving the upper mold core and the lower mold core to slide in the vertical direction; the upper die core comprises an upper die joint and a plurality of upper punching heads connected to the lower surface of the upper die joint, and the lower die core comprises a lower die joint and a plurality of lower punching heads connected to the upper surface of the lower die joint;
the middle die is provided with a plurality of filling holes, and an upper punching head and a lower punching head are connected in a seamless sliding mode in each filling hole; the powder box is connected with a second hydraulic mechanism which drives the powder box to horizontally slide, a discharge hole is formed in the bottom of the powder box, and the bottom of the powder box is in sliding butt joint with the upper surface of the middle die.
2. The tablet press according to claim 1, characterized in that: the middle die is connected with a slide rail, and the side wall of the powder box is in sliding connection with the slide rail.
3. The tablet press according to claim 2, characterized in that: and the plurality of filling holes are arranged in a rectangular array.
4. The tablet pressing machine according to claim 2 or 3, characterized in that: the side walls of the middle die and the filling hole are coated with zirconia materials, and the slide rail is provided with an ion air knife.
5. The tablet press according to claim 4, characterized in that: the first hydraulic mechanism and the second hydraulic mechanism are electrically connected with the single chip microcomputer; the singlechip comprises:
the filling depth module is used for controlling the displacement of a first hydraulic mechanism connected with the lower die core;
the forming pressure module is used for controlling the displacement and the residence time of a first hydraulic mechanism connected with the upper die core;
and the powder scraping module is used for controlling the times of the second hydraulic mechanism for driving the powder box to reciprocate and scraping powder.
6. The method for manufacturing a thermal battery heating plate by the tablet press according to claim 5, comprising the steps of:
step one, preparation of heating powder: mixing active iron powder, potassium perchlorate and multi-element inorganic eutectic fused salt containing KF, KCl and KBr according to a certain proportion to obtain heating powder, and filling the heating powder into a powder box;
step two, parameter setting: setting related parameters of filling depth, powder scraping times, forming pressure and pressure maintaining time in a single chip microcomputer of the tablet press according to actual needs;
step three, spreading powder: after the single chip microcomputer is started, the first hydraulic mechanism connected with the lower die core drives the length of the lower punch head in the filling hole so as to adjust the filling depth of each seasoning hole; the second hydraulic mechanism drives the powder box to reciprocate on the filling hole, and the heating powder in the powder box is filled into the filling hole after leaking out of a discharge hole at the bottom of the powder box;
after the filling hole is filled with the heating powder, a first hydraulic mechanism connected with the upper die core drives an upper punch head to be pressed into the filling hole, the set displacement is achieved, pressure is maintained for a certain time, and then the upper die core is lifted back to the original position;
step five, demolding and taking the slices: and lifting the lower mold core to the horizontal position of the middle mold, and pushing the pressed heating sheet to a sheet collecting area by the reciprocating motion of the powder box to finish demolding, sheet taking and powder spreading again.
7. The method for manufacturing a thermal battery heating plate by the tablet press according to claim 6, characterized in that: in the first step, the mass fraction of the active iron powder is 57-84%, the mass fraction of the potassium perchlorate is 8-17%, and the mass fraction of the inorganic eutectic molten salt is 5-30%.
8. The method for manufacturing a thermal battery heating plate by the tablet press according to claim 6 or 7, characterized in that: in the first step, the proportions of the components in the multi-element inorganic eutectic molten salt in the total amount of the multi-element inorganic eutectic molten salt are as follows: 5 to 30 percent of KF, 5 to 90 percent of KCl and 5 to 90 percent of KBr.
9. The method for manufacturing a thermal battery heating plate by the tablet press according to claim 8, characterized in that: the granularity of the multi-element inorganic eutectic molten salt is 60-100 meshes.
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