Technical economics fund time value demonstration teaching aid

Abstract

The utility model discloses a technical economics fund time value demonstration teaching aid, and belongs to the technical field of teaching aids. The technical economics fund flow demonstration device is convenient to shift and alter data of technical economics fund flow demonstration, can be repeatedly used, can visually demonstrate the change process of technical economics fund flow, and is beneficial to learning, explanation and demonstration. Comprising a hexahedron, and the hexahedron comprises four vertical surfaces, an upper plane and a lower plane; a sliding grooves which are arranged in a forward L shape are formed in the final value vertical face. A sliding grooves which are arranged in a reverse L shape are formed in the present vertical face. M sliding grooves which are arranged in a forward L shape are formed in the left folding value vertical face of the folding value vertical face, N sliding grooves which are arranged in a reverse L shape are formed in the right folding value vertical face of the folding value vertical face, and any writing board can be movably inserted and fixed to the upper end or the right end or the left end of any sliding groove through a plug pin on the back face of the writing board.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching aids, and particularly relates to a demonstration teaching aid for the time value of funds in technical economics. Background Art

[0002] Technical economics is a science that studies economic problems and laws in the technical field, and the mutual relationship between technological progress and economic growth. It is a science that studies the optimal allocation of resources in the technical field, and seeks the best combination of technology and economy for sustainable development. The capital flow starts from the basic elements of economic evaluation, conducts feasibility studies on construction projects, and plays an important role in the benefit evaluation of economic activities in various departments and professional fields of the national economy. Due to the existence of the time value of funds, it is necessary to master the process of capital flow. At present, the teaching demonstration of the capital flow in technical economics still uses hand-drawn topics, which is not easy to express the demonstration process and is relatively complicated to operate. There is currently no demonstration teaching aid for capital flow.

[0003] The calculation of the time value of funds is cumbersome and requires multiple hand-drawn calculations. Usually, the data at a certain place in the drawing needs to be modified multiple times, or the data at multiple places in the drawing needs to be shifted, resulting in affecting the speed and correctness during the calculation, which is not conducive to learning, explanation, and demonstration.

[0004] Therefore, it is very necessary to design a demonstration teaching aid that is convenient for shifting and modifying the data of the demonstration of the capital flow in technical economics, can be reused, and can intuitively demonstrate the changing process of the capital flow in technical economics.

[0005] In technical economics, for a construction project, in terms of construction and operation, it must go through a certain project cycle. During this project cycle, since the inflow and outflow of cash are different in terms of amount or occurrence time, in order to facilitate systematic analysis, the method of drawing a cash flow diagram is usually adopted to intuitively represent it.

[0006] A cash flow diagram is a diagram that reflects the capital movement state of a specific system. It is to draw the cash flow into a chart mainly with a time coordinate, so as to show the corresponding relationship between each cash inflow or outflow, and thus can accurately reflect the cash flow, and can comprehensively, vividly, and directly show what the capital movement state is under the premise of a specific system.

[0007] When drawing a cash flow diagram, the horizontal axis must be used as the time axis and extended to the right. This extension is represented by time. The axis can be divided into several intervals for reflection. One interval represents one unit of time, which is generally expressed in years. From the time points on the time axis, these are mainly used to represent the end of the year or the beginning of the next year. The zero point is the time when the first year starts, which is the time point of the present value. The vertical lines connected to the horizontal axis represent the cash flows at different time points. If the line extends downward, it represents the cash outflow; if the line extends upward, it represents the cash inflow.

[0008] The time value of money refers to the value change of money over time. In other words, a certain amount of money in the future is not equivalent to the same amount of money now because money can earn interest or returns through investment. The time value of money can be explained in two ways: one is to discount a certain amount in the future to the present value, and the other is to calculate the future value after investing a certain amount of money now to obtain interest or returns.

[0009] The present value refers to the value obtained by discounting a certain amount of money in the future to the present. The future value, that is, the terminal value, refers to the value of a certain amount of money now after obtaining a certain interest rate or return over a certain period of time.

[0010] The time in the time value of money can be periodic time such as years, months, days, quarters, etc. Utility Model Content

[0011] The present utility model is to solve the deficiency that there is no special teaching aid for demonstrating the time value of money in technical economics at present, resulting in the difficulty of demonstrating the process of capital flow in technical economics during the teaching process. It provides a teaching aid for demonstrating the time value of money in technical economics, which is convenient for shifting and modifying the data of the demonstration of capital flow in technical economics, can be reused, can intuitively demonstrate the changing process of capital flow in technical economics, and is conducive to learning, explanation and demonstration.

[0012] In order to achieve the above object, the present utility model adopts the following technical solutions:

[0013] A teaching aid for demonstrating the time value of money in technical economics includes a hexahedron, and the hexahedron includes four vertical faces, an upper plane and a lower plane;

[0014] The four vertical surfaces are respectively the final value vertical surface, the present value vertical surface, the discounted value vertical surface, and the blank vertical surface; and the present value vertical surface is adjacent to the final value vertical surface and the discounted value vertical surface respectively, the blank vertical surface is adjacent to the final value vertical surface and the discounted value vertical surface respectively, the final value vertical surface and the discounted value vertical surface are arranged as left and right opposite surfaces; the present value vertical surface and the blank vertical surface are arranged as front and back opposite surfaces; the upper plane and the lower plane are arranged as upper and lower opposite surfaces;

[0015] On the final value vertical surface, there are A chutes respectively arranged in a forward "L" shape, and A is a positive integer greater than or equal to 3;

[0016] On the present value vertical surface, there are A chutes respectively arranged in a reverse "L" shape;

[0017] The discounted value vertical surface is composed of a left discounted value vertical surface and a right discounted value vertical surface arranged side by side;

[0018] On the left discounted value vertical surface of the discounted value vertical surface, there are M chutes respectively arranged in a forward "L" shape, M is a positive integer, and 1 < M < A;

[0019] On the right discounted value vertical surface of the discounted value vertical surface, there are N chutes respectively arranged in a reverse "L" shape, N is a positive integer, and M + N = A;

[0020] At the upper end and the right end of each chute located on the final value vertical surface, there are respectively jacks. At the upper end and the left end of each chute located on the present value vertical surface, there are also respectively jacks. At the upper end and the right end of each chute located on the left discounted value vertical surface, there are also respectively jacks. At the upper end and the left end of each chute located on the right discounted value vertical surface, there are also respectively jacks; the teaching aid further includes writing boards equal in number to the number of chutes and on which writing can be done, and on the back of each writing board, there is a plug fixed that matches the jack; any writing board can be movably inserted and fixed at the upper end or the right end or the left end of any chute through the plug on its back;

[0021] On each chute, there is respectively a slider that can slide on the corresponding chute; the teaching aid further includes writing pieces with capital flow calculation formulas equal in number to the number of chutes and on which writing can be done, and the backs of the writing pieces with capital flow calculation formulas are respectively fixedly connected to the outer end faces of the sliders one by one.

[0022] Preferably, the upper end of each chute is respectively connected to the upper plane;

[0023] The right end of each chute located on the final value vertical surface is not connected to the present value vertical surface; the turning point of each chute located on the final value vertical surface falls on the diagonal line connecting the lower left corner and the upper right corner of the final value vertical surface;

[0024] The left end of each chute located on the present value vertical plane is not communicated with the final value vertical plane; the turning point of each chute located on the present value vertical plane falls on the diagonal line connecting the upper left corner and the lower right corner of the present value vertical plane;

[0025] The right end of each chute located on the left-side discounted value vertical plane falls within the left-side discounted value vertical plane; the turning point of each chute located on the left-side discounted value vertical plane falls on the diagonal line connecting the lower left corner and the upper right corner of the left-side discounted value vertical plane;

[0026] The left end of each chute located on the right-side discounted value vertical plane falls within the right-side discounted value vertical plane; the turning point of each chute located on the right-side discounted value vertical plane falls on the diagonal line connecting the upper left corner and the lower right corner of the right-side discounted value vertical plane;

[0027] The right end of each chute located on the left-side discounted value vertical plane is not communicated with the left end of each chute located on the right-side discounted value vertical plane.

[0028] Preferably, when M = N, the chutes located on the left-side discounted value vertical plane and the chutes located on the right-side discounted value vertical plane are arranged in a one-to-one left-right symmetric manner;

[0029] When N < M, among the M chutes located on the left-side discounted value vertical plane, N chutes and the N chutes located on the right-side discounted value vertical plane are arranged in a one-to-one left-right symmetric manner;

[0030] When M < N, among the N chutes located on the right-side discounted value vertical plane, M chutes and the M chutes located on the left-side discounted value vertical plane are arranged in a one-to-one left-right symmetric manner.

[0031] Preferably, the A is equal to 5, the M is equal to 3, and the N is equal to 2.

[0032] Preferably, the upper end of a support frame is horizontally rotatably connected to the lower plane of the hexahedron.

[0033] Preferably, magnets are respectively fixedly provided at the inner ends of each jack, and magnetic metal blocks are respectively embedded and fixed at the front ends of each bolt.

[0034] Preferably, a display screen is respectively connected to each writing board and each piece of paper with a capital flow calculation formula; a controller and a memory are provided inside the hexahedron, a keyboard is provided on the outer surface of the hexahedron, and the memory, the keyboard, and each display screen are respectively connected to the controller.

[0035] Preferably, a speaker connected to the controller is further provided on the outer surface of the hexahedron.

[0036] Preferably, a wireless module connected to the controller is provided on the hexahedron.

[0037] The utility model can achieve the following effects:

[0038] The teaching aid of the utility model is convenient for shifting and modifying the data for demonstrating the capital flow in technical economics, can be reused, can visually demonstrate the change process of the capital flow in technical economics, is beneficial to learning and teaching demonstrations, is convenient for realizing the reuse of the teaching aid, and the capital flow calculation formula can also be directly seen, with intuitive demonstration, which is more beneficial for teachers to teach and students to learn, and has good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of a three-dimensional connection structure of the hexahedron of the utility model when no jack is provided in the chute.

[0040] Figure 2 It is a schematic diagram of a three-dimensional connection structure of the hexahedron of the utility model when no jack is provided in the chute.

[0041] Figure 3 It is a schematic diagram of a three-dimensional connection structure of the hexahedron of the utility model when no jack is provided in the chute.

[0042] Figure 4 It is a schematic diagram of a three-dimensional connection structure of the hexahedron of the utility model when no jack is provided in the chute.

[0043] Figure 5 It is a schematic diagram of a three-dimensional connection structure of the hexahedron of the utility model when no jack is provided in the chute.

[0044] Figure 6 It is a schematic diagram of a three-dimensional connection structure of the hexahedron of the utility model when no jack is provided in the chute.

[0045] Figure 7 It is a schematic diagram of a front view connection structure of the hexahedron of the utility model when no jack is provided in the chute, as seen from the connection between the vertical face of the final value and the vertical face of the present value.

[0046] Figure 8 It is a schematic diagram of a front view connection structure of the hexahedron of the utility model when no jack is provided in the chute, as seen from the connection between the vertical face of the discount value and the vertical face of the blank.

[0047] Figure 9 It is a schematic diagram of a front view connection structure of the hexahedron of the utility model on the vertical face of the final value after jacks are provided in the chute.

[0048] Figure 10 It is a schematic diagram of a front view connection structure of the hexahedron of the utility model on the vertical face of the present value after jacks are provided in the chute.

[0049] Figure 11 This is a front view connection structure schematic diagram of the six-sided body of the present utility model after inserting holes in the chute on the vertical surface of the discount value.

[0050] Figure 12 This is a top view connection structure schematic diagram of the six-sided body of the present utility model on the upper plane.

[0051] Figure 13 This is a connection structure schematic diagram of the inner end of the bolt on the back of the writing board of the present utility model inserted into the insertion hole at the upper end of a chute fixed on the vertical surface of the final value.

[0052] Figure 14 This is a cross-sectional connection structure schematic diagram of the present utility model after fixedly installing a magnet at the inner end of the insertion hole and fixedly installing a magnetic metal block embedded at the front end of the bolt.

[0053] Figure 15 This is a front view connection structure schematic diagram of the six-sided body of the present utility model after inserting holes in the chute, when the writing board and the writing piece of the capital turnover calculation formula are both on the corresponding chutes on the vertical surface of the final value.

[0054] Figure 16 This is a front view connection structure schematic diagram of Embodiment 2 of the present utility model when display screens are respectively connected to the writing board and the writing piece of the capital turnover calculation formula.

[0055] Figure 17 This is a schematic block diagram of the circuit principle connection of Embodiment 2 of the present utility model. Specific embodiments

[0056] The technical solution of the present utility model will be further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0057] Embodiment 1: A demonstration teaching aid for the time value of money in technical economics, see Figures 1-15 as shown. It includes a six-sided body 10, and the six-sided body includes four vertical surfaces, an upper plane 5 and a lower plane 6;

[0058] The four vertical surfaces are respectively the vertical surface of the final value, the vertical surface of the present value, the vertical surface of the discount value and the blank vertical surface; and the vertical surface of the present value 2 is adjacent to the vertical surface of the final value 1 and the vertical surface of the discount value 3 respectively, the blank vertical surface 4 is adjacent to the vertical surface of the final value and the vertical surface of the discount value respectively, the vertical surface of the final value and the vertical surface of the discount value are arranged as left and right front-facing surfaces; the vertical surface of the present value and the blank vertical surface are arranged as front and back front-facing surfaces; the upper plane and the lower plane are arranged as upper and lower front-facing surfaces;

[0059] On the vertical surface of the final value, there are A chutes 7 arranged in a forward "L" shape respectively, and A is a positive integer greater than or equal to 3;

[0060] On the present value vertical plane, there are A chutes 8 arranged in a reverse "L" shape respectively;

[0061] The present value vertical plane is composed of a left present value vertical plane and a right present value vertical plane arranged side by side on the left and right;

[0062] On the left present value vertical plane of the present value vertical plane, there are M chutes 19 arranged in a forward "L" shape respectively, M is a positive integer, and 1 < M < A;

[0063] On the right present value vertical plane of the present value vertical plane, there are N chutes 9 arranged in a reverse "L" shape respectively, N is a positive integer, and M + N = A;

[0064] At the upper end and the right end of each chute located on the terminal value vertical plane, there are insertion holes 11 respectively. At the upper end and the left end of each chute located on the present value vertical plane, there are also insertion holes respectively. At the upper end and the right end of each chute located on the left present value vertical plane, there are also insertion holes respectively. At the upper end and the left end of each chute located on the right present value vertical plane, there are also insertion holes respectively. The teaching aid further includes writing boards 13 equal in number to the number of chutes and on which writing can be done. On the back 14 of each writing board, there is a plug 16 fixed that matches the insertion hole; Any writing board can be movably inserted and fixed at the upper end or the right end or the left end of any chute through the plug on its back. The back of the writing board is fixed on the outer end face 15 of the plug. The front end 17 of the plug is inserted into the insertion hole. The outer surface 12 of the writing board is the writing surface.

[0065] On each chute, there is a slider that can slide on the corresponding chute respectively; The teaching aid further includes calculation formula writing pieces 21 for capital flow equal in number to the number of chutes and on which writing can be done. The backs of the calculation formula writing pieces for capital flow are respectively fixedly connected to the outer end faces of the sliders one by one.

[0066] The upper end of each chute is respectively communicated with the upper plane;

[0067] The right end of each chute located on the terminal value vertical plane is not communicated with the present value vertical plane; The turning point of each chute located on the terminal value vertical plane falls on the diagonal line connecting the lower left corner and the upper right corner of the terminal value vertical plane;

[0068] The left end of each chute located on the present value vertical plane is not communicated with the terminal value vertical plane; The turning point of each chute located on the present value vertical plane falls on the diagonal line connecting the upper left corner and the lower right corner of the present value vertical plane;

[0069] The right end of each chute located on the left-fold vertical plane falls within the left-fold vertical plane; the turning point of each chute located on the left-fold vertical plane falls on the diagonal line connecting the lower left corner and the upper right corner of the left-fold vertical plane;

[0070] The left end of each chute located on the right-fold vertical plane falls within the right-fold vertical plane; the turning point of each chute located on the right-fold vertical plane falls on the diagonal line connecting the upper left corner and the lower right corner of the right-fold vertical plane;

[0071] The right end of each chute located on the left-fold vertical plane is not connected to the left end of each chute located on the right-fold vertical plane.

[0072] When M = N, the chutes on the left-fold vertical plane and the chutes on the right-fold vertical plane are arranged in a one-to-one left-right symmetric manner;

[0073] When N < M, among the M chutes on the left-fold vertical plane, N chutes and the N chutes on the right-fold vertical plane are arranged in a one-to-one left-right symmetric manner;

[0074] When M < N, among the N chutes on the right-fold vertical plane, M chutes and the M chutes on the left-fold vertical plane are arranged in a one-to-one left-right symmetric manner.

[0075] In this embodiment, A is equal to 5, M is equal to 3, and N is equal to 2.

[0076] The upper end of a support frame is horizontally rotatably connected to the lower plane of the hexahedron. Not shown in the drawings.

[0077] Magnets 20 are respectively fixedly provided at the inner ends of each jack, and magnetic metal blocks 18 are respectively embedded and fixedly provided at the front ends 17 of each bolt.

[0078] In this embodiment, attracting the magnetic metal block to the magnet can prevent the bolt from easily withdrawing from the jack, prevent the writing board from falling, and has good reliability.

[0079] For example, on the final value vertical plane, see Figure 9 As shown, from left to right in sequence are:

[0080] The content written on the writing board on the first chute represents the value of funds at the beginning of the 1st year, which is converted to the value of funds at the end of the 5th year through the set capital flow calculation formula;

[0081] The content written on the writing board on the second sliding groove represents the value of funds at the beginning of the second year, which is converted to the value of funds at the end of the fifth year through the set capital flow calculation formula;

[0082] The content written on the writing board on the third sliding groove represents the value of funds at the beginning of the third year, which is converted to the value of funds at the end of the fifth year through the set capital flow calculation formula;

[0083] The content written on the writing board on the fourth sliding groove represents the value of funds at the beginning of the fourth year, which is converted to the value of funds at the end of the fifth year through the set capital flow calculation formula;

[0084] The content written on the writing board on the fifth sliding groove represents the value of funds at the beginning of the fifth year, which is converted to the value of funds at the end of the fifth year through the set capital flow calculation formula.

[0085] For example, on the present value vertical plane, see Figure 10 as shown, from left to right in sequence are:

[0086] The content written on the writing board on the first sliding groove represents the value of funds at the end of the first year, which is converted to the value of funds at the beginning of the first year through the set capital flow calculation formula;

[0087] The content written on the writing board on the second sliding groove represents the value of funds at the end of the second year, which is converted to the value of funds at the beginning of the first year through the set capital flow calculation formula;

[0088] The content written on the writing board on the third sliding groove represents the value of funds at the end of the third year, which is converted to the value of funds at the beginning of the first year through the set capital flow calculation formula;

[0089] The content written on the writing board on the fourth sliding groove represents the value of funds at the end of the fourth year, which is converted to the value of funds at the beginning of the first year through the set capital flow calculation formula;

[0090] The content written on the writing board on the fifth sliding groove represents the value of funds at the end of the fifth year, which is converted to the value of funds at the beginning of the first year through the set capital flow calculation formula.

[0091] For example, on the discounted value vertical plane, see Figure 11 as shown, from left to right in sequence are:

[0092] The content written on the writing board on the first sliding groove represents the value of funds at the beginning of the first year, which is converted to the value of funds at the end of the third year through the set capital flow calculation formula;

[0093] The content written on the writing board on the second chute represents the value of funds at the beginning of the second year, which is converted to the value of funds at the end of the third year after being calculated by the set capital flow calculation formula;

[0094] The content written on the writing board on the third chute represents the value of funds at the beginning of the third year, which is converted to the value of funds at the end of the third year after being calculated by the set capital flow calculation formula;

[0095] The content written on the writing board on the fourth chute represents the value of funds at the end of the fourth year, which is converted to the value of funds at the beginning of the fourth year after being calculated by the set capital flow calculation formula;

[0096] The content written on the writing board on the fifth chute represents the value of funds at the end of the fifth year, which is converted to the value of funds at the beginning of the fourth year after being calculated by the set capital flow calculation formula.

[0097] In Figures 9-11 , the abscissa is time, each small grid represents 1 year, the line going up is income, and the line going down is expenditure.

[0098] In Figure 9 , the positive "L"-shaped chute here indicates that the expenditures of each year are calculated to the future value at the end of the fifth year.

[0099] In Figure 10 , the reverse "L"-shaped chute here indicates that the expenditures of each year are calculated to the present value at the beginning of the first year.

[0100] In Figure 11 , the chute extending towards the middle here represents the value of the expenditures of each year in the third year.

[0101] The calculation formula for the capital flow process is written on the capital flow calculation formula writing piece, which is convenient for teaching, intuitive, and easy to understand.

[0102] The teaching aid of this embodiment is convenient for shifting and modifying the data of the capital flow demonstration in technical economics, can be reused, can intuitively demonstrate the change process of the capital flow in technical economics, is conducive to learning and explanation demonstrations, is convenient for realizing the reuse of the teaching aid, the capital flow calculation formula can also be directly seen, the demonstration is intuitive, is more conducive to teachers' lectures and students' learning, and has good reliability.

[0103] Example 2: Refer to Figure 16 , Figure 17As shown. A display screen 22 is respectively connected to each writing board and each calculation formula writing piece for fund transfer; a controller 27 and a memory 23 are provided inside the hexahedron, a keyboard 24 is provided on the outer surface of the hexahedron, and the memory, the keyboard and each display screen are respectively connected to the controller. A speaker 25 connected to the controller is further provided on the outer surface of the hexahedron. A wireless module 26 connected to the controller is provided on the hexahedron. Under the control of the controller, the input data can be displayed on the display screen through the keyboard. Similar to the keyboard of a computer, the data input on the keyboard can be displayed on the computer monitor. An electrical plug electrically connected to the display screen is provided at the front end of the bolt, and an electrical socket electrically connected to the controller is provided in the jack. When the bolt is inserted into the jack, the electrical plug is inserted into the electrical socket to realize the electrical signal connection between the display screen and the controller. In this embodiment, data can also be input remotely through the wireless module, and voice prompts can be given through the speaker. This embodiment has good scalability and high reliability, and is more conducive to teachers' lectures and students' learning.

Claims

1. A technical economics time value of money demonstration teaching aid, characterized in that: It includes a hexahedron, wherein the hexahedron includes four vertical faces, an upper plane and a lower plane; The four vertical planes are respectively a terminal value vertical plane, a present value vertical plane, a discount value vertical plane and a blank vertical plane; and the present value vertical plane is adjacent to the terminal value vertical plane and the discount value vertical plane respectively, and the blank vertical plane is adjacent to the terminal value vertical plane and the discount value vertical plane respectively, and the terminal value vertical plane and the discount value vertical plane are arranged opposite to each other on the left and right; the present value vertical plane and the blank vertical plane are arranged opposite to each other on the front and back; the upper plane and the lower plane are arranged opposite to each other on the top and bottom; A chutes are arranged in a positive "L" shape on the terminal value vertical plane, and A is a positive integer greater than or equal to 3; A plurality of chutes are arranged in a reverse "L" shape on the vertical plane of the present value; The folded vertical surface is composed of a left folded vertical surface and a right folded vertical surface arranged side by side; On the left side of the folding vertical surface, M slide grooves are arranged in a positive "L" shape, M is a positive integer, 1<M<A; On the right side of the folding vertical surface, there are N chutes arranged in reverse "L" shape, N is a positive integer, M+N=A; Each slide groove on the final value vertical plane is provided with a plug hole at its upper end and right end, each slide groove on the present value vertical plane is provided with a plug hole at its upper end and left end, each slide groove on the left-hand deduction vertical plane is provided with a plug hole at its upper end and right end, and each slide groove on the right-hand deduction vertical plane is provided with a plug hole at its upper end and left end; the teaching aid also includes writing boards equal in number to the slide grooves and on which writing can be written, and a latch matching the latch hole is fixed on the back of each writing board; any writing board can be inserted and fixed at the upper end, right end or left end of any slide groove through the latch on its back; A slider which can slide on the corresponding slide is respectively provided on each slide groove; the teaching aid also includes a writing sheet of the capital flow calculation formula which is equal to the number of the slide grooves and can be written on, and the back of the writing sheet of the capital flow calculation formula is respectively fixedly connected one-to-one to the outer end surface of the slider.

2. A technical economics time value of money demonstration teaching aid according to claim 1, characterized in that: The upper end of each chute is respectively connected to the upper plane; The right end of each chute located on the terminal value vertical plane is not connected to the present value vertical plane; the turning point of each chute located on the terminal value vertical plane falls on the line connecting the diagonal lines between the lower left corner and the upper right corner of the terminal value vertical plane; The left end of each chute located on the present value vertical plane is not connected to the terminal value vertical plane; the turning point of each chute located on the present value vertical plane falls on the line connecting the diagonal lines between the upper left corner and the lower right corner of the present value vertical plane; The right end of each chute located on the left-hand fold vertical plane falls within the left-hand fold vertical plane; the turning point of each chute located on the left-hand fold vertical plane falls on the line connecting the diagonal lines between the lower left corner and the upper right corner of the left-hand fold vertical plane; The left end of each chute located on the right vertical plane of the deflection value falls within the right vertical plane of the deflection value; the turning point of each chute located on the right vertical plane of the deflection value falls on the line connecting the diagonal lines between the upper left corner and the lower right corner of the right vertical plane of the deflection value; The right end of each chute on the left vertical surface of the folding value is not connected to the left end of each chute on the right vertical surface of the folding value.

3. A technical economics time value of money demonstration teaching aid according to claim 2, characterized in that: When M = N, the chutes on the left vertical surface of the folding value and the chutes on the right vertical surface of the folding value are arranged in a one-to-one left-right symmetry; When N < M, among the M chutes on the left vertical surface of the folding value, N chutes and the N chutes on the right vertical surface of the folding value are arranged in a one-to-one left-right symmetry; When M < N, among the N chutes on the right vertical surface of the folding value, M chutes and the M chutes on the left vertical surface of the folding value are arranged in a one-to-one left-right symmetry.

4. A technical economics time value of money demonstration teaching aid according to claim 1, characterized in that: The said A is equal to 5, the said M is equal to 3, and the said N is equal to 2.

5. A technical economics time value of money demonstration teaching aid according to claim 1, characterized in that: The upper end of a support frame is horizontally rotatably connected to the lower plane of the hexahedron.

6. A technical economics time value of money demonstration teaching aid according to claim 1, characterized in that: Magnets are respectively fixedly arranged at the inner ends of each jack, and magnetic metal blocks are respectively embedded and fixedly arranged at the front ends of each bolt.

7. A technical economics time value of money demonstration teaching aid according to claim 1, characterized in that: A display screen is respectively connected to each writing board and each writing piece of the capital flow calculation formula; a controller and a memory are arranged inside the hexahedron, a keyboard is arranged on the outer surface of the hexahedron, and the memory, the keyboard and each display screen are respectively connected to the controller.

8. A technical economics time value of money demonstration teaching aid according to claim 7, characterized in that: A speaker connected to the controller is further arranged on the outer surface of the hexahedron.

9. A technical economics time value of money demonstration teaching aid according to claim 7, characterized in that: A wireless module connected to the controller is arranged on the hexahedron.

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